Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:26:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < graph[node].size ( ); i++ ){ ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:74:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int j = 0; j < graph[node].size ( ); j++ ) ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:37:18: warning: unused variable 'vec' [-Wunused-variable] { int n, m, i, vec; ^~~