Compilare: main.cpp: In function 'int DFS(int)': main.cpp:35:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[x].size(); ++i) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:95:22: warning: narrowing conversion of 'x' from 'long long int' to 'long long unsigned int' inside { } [-Wnarrowing] a[l] = { x,y,c,l }; ^ main.cpp:95:22: warning: narrowing conversion of 'y' from 'long long int' to 'long long unsigned int' inside { } [-Wnarrowing] main.cpp:95:22: warning: narrowing conversion of 'c' from 'long long int' to 'long long unsigned int' inside { } [-Wnarrowing] main.cpp:101:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (mp[make_pair(x, y)] != c)