[vpr][route][rr_graph] change comparator-based range to projection-based

Author: amin1377

vpr/src/route/rr_graph_generation/rr_graph_area.cpp

@@ -290,9 +290,7 @@ static void count_bidir_routing_transistors(int num_switch, float R_minW_nmos, f
     /* Now add in the input connection block transistors. */
 
     // Get most frequent ipin switch
-    auto most_frequent_ipin_switch_it = std::ranges::max_element(
-        ipin_switch_count,
-        [](const auto& a, const auto& b) noexcept { return a.second < b.second; });
+    auto most_frequent_ipin_switch_it = std::ranges::max_element(ipin_switch_count, {}, [](const auto& p) noexcept { return p.second; });
     VTR_ASSERT(most_frequent_ipin_switch_it != ipin_switch_count.end());
     RRSwitchId most_frequent_ipin_switch = most_frequent_ipin_switch_it->first;
 
@@ -491,9 +489,7 @@ static void count_unidir_routing_transistors(std::vector<t_segment_inf>& /*segme
     /* Now add in the input connection block transistors. */
 
     // Get most frequent ipin switch
-    auto most_frequent_ipin_switch_it = std::ranges::max_element(
-        ipin_switch_count,
-        [](const auto& a, const auto& b) noexcept { return a.second < b.second; });
+    auto most_frequent_ipin_switch_it = std::ranges::max_element(ipin_switch_count, {}, [](const auto& p) noexcept { return p.second; });
     VTR_ASSERT(most_frequent_ipin_switch_it != ipin_switch_count.end());
     RRSwitchId most_frequent_ipin_switch = most_frequent_ipin_switch_it->first;