Compilare: main.cpp: In function 'int PairUp(int)': main.cpp:22:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | for ( int i = 0; i < g[n].size(); i++ ) { | ~~^~~~~~~~~~~~~ main.cpp:30:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for ( int i = 0; i < g[n].size(); i++ ) { | ~~^~~~~~~~~~~~~