Compilare: main.cpp: In function 'void dfs(int, int, int)': main.cpp:17:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < edge[nod].size(); i++ ){ ~~^~~~~~~~~~~~~~~~~~ main.cpp:35:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < edge[nod].size(); i++ ){ ~~^~~~~~~~~~~~~~~~~~ main.cpp:37:13: warning: unused variable 'cost' [-Wunused-variable] int cost = edge[nod][i].second; ^~~~