Compilare: main.cpp: In function 'int main()': main.cpp:121:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 121 | for (int i = 0; i < metro.size(); i++) | ~~^~~~~~~~~~~~~~ main.cpp:132:40: warning: 'ansY' may be used uninitialized [-Wmaybe-uninitialized] 132 | fout << ansX << ' ' << ansY << ' ' << ans; | ^~~ main.cpp:120:30: note: 'ansY' was declared here 120 | int ans = INF, ansX, ansY; | ^~~~ main.cpp:132:25: warning: 'ansX' may be used uninitialized [-Wmaybe-uninitialized] 132 | fout << ansX << ' ' << ansY << ' ' << ans; | ^~~ main.cpp:120:24: note: 'ansX' was declared here 120 | int ans = INF, ansX, ansY; | ^~~~