Compilare: main.cpp: In function 'bool pairup(int)': main.cpp:28:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h = 0 ; h < g[node].size() ; h++){ ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:63:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h = 0 ; h < g[i].size() ; h++) ~~^~~~~~~~~~~~~ main.cpp:78:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < sol.size() ; i++) ~~^~~~~~~~~~~~