bigint.cpp

#include <bits/stdc++.h> //Stack size ~2'000'000(x4)
#define pb push_back
#define mp make_pair
#define ll long long
#define ull unsigned long long
#define all(a) begin(a),end(a)
#define FOR(x,val,to) for(int x=(val);x<int((to));++x)
#define FORE(x,val,to) for(auto x=(val);x<=(to);++x)
#define FORR(x,arr) for(auto &x: arr)
#define FORS(x,plus,arr) for(auto x = begin(arr)+(plus); x != end(arr); ++x)
#define PRINT(arr) {copy(begin((arr)), end((arr)), ostream_iterator<int>(cout, " "));cout<<'\n';}
#define REE(s_) {cout<<s_<<'\n';exit(0);} //print s_ and terminate program
#define GETCIN(arr) for(auto &i: (arr)) cin>>i
#define GET(arr) for(auto &i: (arr)) sc(i)
#define GETSTR(arr) for(auto &i: (arr)) getstr(i)
#define INF 2139062143 //127 in memset -> memset(arr,127,size)
#define SINF 1061109567 //Safe INF, for graphs or 2d arrays 63 in memset(arr,63,size)
#define LL_INF 7234017283807667300 //100 in memset(arr,100,size) !!!must be LL
#define whatis(x) cerr << #x << " is " << x << endl;
#define e1 first
#define e2 second
typedef std::pair<int,int> pi;
typedef std::vector<int> vi;
typedef std::vector<std::string> vs;
#define umap unordered_map
#define uset unordered_set
using namespace std;

#ifdef _WIN32
#define getchar_unlocked() _getchar_nolock()
#define _CRT_DISABLE_PERFCRIT_LOCKS
#endif
template<class T> ostream& operator<<(ostream &os, vector<T> V) { os<<"[";for(auto const &vv:V)os<<vv<<","; os<<"]"; return os; }//prnt vec
template<class L, class R> ostream& operator<<(ostream &os, pair<L, R> P) { os<<"("<<P.first<<","<<P.second<<")"; return os; }//prnt pair
template<typename T> inline void print_128(T num){ if(!num) return; print_128(num / 10); cout.put((num % 10) + '0'); }
inline int fstoi(const string &str){auto it=str.begin();bool neg=0;int num=0;if(*it=='-')neg=1;else num=*it-'0';++it;while(it<str.end()) num=num*10+(*it++-'0');if(neg)num*=-1;return num;}
inline void getch(char &x){while(x = getchar_unlocked(), x < 33){;}}
inline void getstr(string &str){str.clear(); char cur;while(cur=getchar_unlocked(),cur<33){;}while(cur>32){str+=cur;cur=getchar_unlocked();}}template<typename ...Args> inline void getstr(string &str, Args &...arg){str.clear();char cur;while(cur=getchar_unlocked(),cur<33){;}while(cur>32){str+=cur;cur=getchar_unlocked();}getstr(arg...);}
template<typename T> inline bool sc(T &num){ bool neg=0; int c; num=0; while(c=getchar_unlocked(),c<33){if(c == EOF) return false;} if(c=='-'){ neg=1; c=getchar_unlocked(); } for(;c>47;c=getchar_unlocked()) num=num*10+c-48; if(neg) num*=-1; return true;}template<typename T, typename ...Args> inline void sc(T &num, Args &...args){ bool neg=0; int c; num=0; while(c=getchar_unlocked(),c<33){;} if(c=='-'){ neg=1; c=getchar_unlocked(); } for(;c>47;c=getchar_unlocked()) num=num*10+c-48; if(neg) num*=-1; sc(args...); }

int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);
    int n = 995;
    int cur = 2;
    vector<int> bigint1({1});
    vector<int> bigint2({2});
    while(n--){
        vector<int> big2orig = bigint2;
        auto it2 = bigint2.begin();
        auto it1 = bigint1.begin();
        int carry = 0;
        while(it1 < bigint1.end()){
            *it2++ = (carry += (*it1++)+*it2)%10;
            carry /= 10;
        }
        while(carry && it2 < bigint2.end()){
            *it2++ = (carry+=*it2)%10;
            carry /= 10;
        }
        while(carry){
            bigint2.pb(carry%10);
            carry /= 10;
        }
        bigint1 = big2orig;
        for(auto i = bigint2.rbegin(); i < bigint2.rend(); ++i)
            cout << *i;
        cout.put(10);
    }
    /* while(cur < n){ */
    /*     int carry = 0; */
    /*     FORR(i,bigint){ */
    /*         i = (carry += i*cur)%10; */
    /*         carry/=10; */
    /*     } */
    /*     while(carry){ */
    /*         bigint.pb(carry%10); */
    /*         carry/=10; */
    /*     } */
    /*     ++cur; */
    /*     for(auto i = bigint.rbegin(); i < bigint.rend(); ++i) */
    /*         cout << *i; */
    /*     cout.put(10); */
    /* } */
}