Compilare: main.cpp: In function 'int PairUp(int)': main.cpp:23:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | for ( int i = 0; i < g[n].size(); i++ ) { | ~~^~~~~~~~~~~~~ main.cpp:31:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for ( int i = 0; i < g[n].size(); i++ ) { | ~~^~~~~~~~~~~~~ main.cpp: In function 'void dfs(int)': main.cpp:43:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | for ( int i = 0; i < g[n].size(); i++ ) | ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:64:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | for ( int j = 0; j < s.size(); j++ ) { | ~~^~~~~~~~~~