Compilare: main.cpp: In function 'int PairUp(int)': main.cpp:25:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for ( int i = 0; i < g[n].size(); i++ ) { | ~~^~~~~~~~~~~~~ main.cpp:33:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | for ( int i = 0; i < g[n].size(); i++ ) { | ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:64:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | for ( int j = 0; j <= g[i].size(); j++ ) { | ~~^~~~~~~~~~~~~~ main.cpp:107:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 107 | for ( int i = 0; i < ans.size(); i++ ) | ~~^~~~~~~~~~~~