Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:22:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0 ; i < G[nod1].size() ; ++i ){ ^ user.cpp:26:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int j = 0 ; j < G[nod2].size() ; ++j ){ ^ user.cpp: In function ‘int main()’: user.cpp:38:19: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:41:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d\n",&x,&y); ^ user.cpp:47:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%c ",&C[i]); ^