Compilare: main.cpp: In function 'void dfs(int)': main.cpp:15:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < graph[node].size ( ); i++ ){ ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int quary(int, long long int)': main.cpp:26:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < graph[node].size ( ); i++ ){ ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:37:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^