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‎paginated_contents/algorithms/4th_thousand/README.md

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| # | Title | Solutions | Video | Difficulty | Tag
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|------|-----------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------|------------|----------------------------------------------------------------------
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| 3191 | [Minimum Operations to Make Binary Array Elements Equal to One I](https://leetcode.com/problems/minimum-operations-to-make-binary-array-elements-equal-to-one-i/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3191.java) | | Medium |
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| 3190 | [Find Minimum Operations to Make All Elements Divisible by Three](https://leetcode.com/problems/find-minimum-operations-to-make-all-elements-divisible-by-three/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3190.java) | | Easy |
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| 3186 | [Maximum Total Damage With Spell Casting](https://leetcode.com/problems/maximum-total-damage-with-spell-casting/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3186.java) | | Medium | DP
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| 3185 | [Count Pairs That Form a Complete Day II](https://leetcode.com/problems/count-pairs-that-form-a-complete-day-ii/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3185.java) | | Medium |
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| 3184 | [Count Pairs That Form a Complete Day I](https://leetcode.com/problems/count-pairs-that-form-a-complete-day-i/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3184.java) | | Easy |
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| 3178 | [Find the Child Who Has the Ball After K Seconds](https://leetcode.com/problems/find-the-child-who-has-the-ball-after-k-seconds/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3178.java) | | Easy |
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| 3175 | [Find The First Player to win K Games in a Row](https://leetcode.com/problems/find-the-first-player-to-win-k-games-in-a-row/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3175.java) | | Medium |
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| 3174 | [Clear Digits](https://leetcode.com/problems/clear-digits/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3174.java) | | Easy |
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| 3164 | [Find the Number of Good Pairs II](https://leetcode.com/problems/find-the-number-of-good-pairs-ii/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3164.java) | | Medium |
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| 3162 | [Find the Number of Good Pairs I](https://leetcode.com/problems/find-the-number-of-good-pairs-i/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3162.java) | | Easy |
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| 3157 | [Find the Level of Tree with Minimum Sum](https://leetcode.com/problems/find-the-level-of-tree-with-minimum-sum/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3157.java) | | Medium |BFS
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| 3131 | [Find the Integer Added to Array I](https://leetcode.com/problems/find-the-integer-added-to-array-i/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3131.java) | | Easy |
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| 3127 | [Make a Square with the Same Color](https://leetcode.com/problems/make-a-square-with-the-same-color/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3127.java) | | Easy |
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| 3120 | [Count the Number of Special Characters I](https://leetcode.com/problems/count-the-number-of-special-characters-i/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3120.java) | | Easy |
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| 3046 | [Split the Array](https://leetcode.com/problems/split-the-array/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3046.java) | | Easy |
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| 3042 | [Count Prefix and Suffix Pairs I](https://leetcode.com/problems/count-prefix-and-suffix-pairs-i/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3042.java) | | Easy |
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| 3038 | [Maximum Number of Operations With the Same Score I](https://leetcode.com/problems/maximum-number-of-operations-with-the-same-score-i/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3038.java) | | Easy |
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| 3033 | [Modify the Matrix](https://leetcode.com/problems/modify-the-matrix/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3033.java) | | Easy |
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| 3006 | [Find Beautiful Indices in the Given Array I](https://leetcode.com/problems/find-beautiful-indices-in-the-given-array-i/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3006.java) | | Medium |
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| 3005 | [Count Elements With Maximum Frequency](https://leetcode.com/problems/count-elements-with-maximum-frequency/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3005.java) | | Easy |
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| # | Title | Solutions | Video | Difficulty | Tag
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|------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------|------------|----------------------------------------------------------------------
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| 3192 | [Minimum Operations to Make Binary Array Elements Equal to One II](https://leetcode.com/problems/minimum-operations-to-make-binary-array-elements-equal-to-one-ii/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3192.java) | | Medium |
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| 3191 | [Minimum Operations to Make Binary Array Elements Equal to One I](https://leetcode.com/problems/minimum-operations-to-make-binary-array-elements-equal-to-one-i/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3191.java) | | Medium |
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| 3190 | [Find Minimum Operations to Make All Elements Divisible by Three](https://leetcode.com/problems/find-minimum-operations-to-make-all-elements-divisible-by-three/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3190.java) | | Easy |
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| 3186 | [Maximum Total Damage With Spell Casting](https://leetcode.com/problems/maximum-total-damage-with-spell-casting/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3186.java) | | Medium | DP
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| 3185 | [Count Pairs That Form a Complete Day II](https://leetcode.com/problems/count-pairs-that-form-a-complete-day-ii/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3185.java) | | Medium |
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| 3184 | [Count Pairs That Form a Complete Day I](https://leetcode.com/problems/count-pairs-that-form-a-complete-day-i/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3184.java) | | Easy |
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| 3178 | [Find the Child Who Has the Ball After K Seconds](https://leetcode.com/problems/find-the-child-who-has-the-ball-after-k-seconds/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3178.java) | | Easy |
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| 3175 | [Find The First Player to win K Games in a Row](https://leetcode.com/problems/find-the-first-player-to-win-k-games-in-a-row/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3175.java) | | Medium |
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| 3174 | [Clear Digits](https://leetcode.com/problems/clear-digits/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3174.java) | | Easy |
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| 3164 | [Find the Number of Good Pairs II](https://leetcode.com/problems/find-the-number-of-good-pairs-ii/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3164.java) | | Medium |
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| 3162 | [Find the Number of Good Pairs I](https://leetcode.com/problems/find-the-number-of-good-pairs-i/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3162.java) | | Easy |
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| 3157 | [Find the Level of Tree with Minimum Sum](https://leetcode.com/problems/find-the-level-of-tree-with-minimum-sum/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3157.java) | | Medium |BFS
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| 3131 | [Find the Integer Added to Array I](https://leetcode.com/problems/find-the-integer-added-to-array-i/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3131.java) | | Easy |
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| 3127 | [Make a Square with the Same Color](https://leetcode.com/problems/make-a-square-with-the-same-color/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3127.java) | | Easy |
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| 3120 | [Count the Number of Special Characters I](https://leetcode.com/problems/count-the-number-of-special-characters-i/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3120.java) | | Easy |
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| 3046 | [Split the Array](https://leetcode.com/problems/split-the-array/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3046.java) | | Easy |
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| 3042 | [Count Prefix and Suffix Pairs I](https://leetcode.com/problems/count-prefix-and-suffix-pairs-i/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3042.java) | | Easy |
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| 3038 | [Maximum Number of Operations With the Same Score I](https://leetcode.com/problems/maximum-number-of-operations-with-the-same-score-i/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3038.java) | | Easy |
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| 3033 | [Modify the Matrix](https://leetcode.com/problems/modify-the-matrix/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3033.java) | | Easy |
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| 3006 | [Find Beautiful Indices in the Given Array I](https://leetcode.com/problems/find-beautiful-indices-in-the-given-array-i/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3006.java) | | Medium |
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| 3005 | [Count Elements With Maximum Frequency](https://leetcode.com/problems/count-elements-with-maximum-frequency/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3005.java) | | Easy |

‎src/main/java/com/fishercoder/solutions/fourththousand/_3192.java

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package com.fishercoder.solutions.fourththousand;
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public class _3192 {
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public static class Solution1 {
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/**
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* 1. Go from left to right;
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* 2. The only way to flip the entire array to be 1s is to change each nums[i] = 0 to nums[i] = 1 whenever we encounter a 0;
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* 3. if we flip each number twice, it's back to its original number, so we only need to keep track of how many times each number is flipped instead of actually flipping the number;
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* 4. keep the original array intact, check two conditions:
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* nums[i] is 0 or 1
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* ops is odd or even
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*/
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public int minOperations(int[] nums) {
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int ops = 0;
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for (int i = 0; i < nums.length; i++) {
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if (nums[i] == 0 && ops % 2 == 0) {
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//this means after an even number of flipping, this number is (originally) a zero, so we need to flip it and all the numbers to its right
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ops++;
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}
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if (nums[i] == 1 && ops % 2 == 1) {
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//this means after an odd number of flipping prior to reaching this number and this number is a one, so it should have been flipped to become a zero, so we need to flip it
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ops++;
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}
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}
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return ops;
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}
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}
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}

‎src/test/java/com/fishercoder/fourththousand/_3192Test.java

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package com.fishercoder.fourththousand;
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import com.fishercoder.solutions.fourththousand._3192;
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import org.junit.jupiter.api.BeforeEach;
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import org.junit.jupiter.api.Test;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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public class _3192Test {
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private static _3192.Solution1 solution1;
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@BeforeEach
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public void setup() {
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solution1 = new _3192.Solution1();
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}
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@Test
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public void test1() {
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assertEquals(4, solution1.minOperations(new int[]{0, 1, 1, 0, 1}));
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}
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@Test
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public void test2() {
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assertEquals(1, solution1.minOperations(new int[]{1, 0, 0, 0}));
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}
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}

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