Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:38:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size(); i++) ^ user.cpp:46:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < v[nod].size(); j++) ^ user.cpp: In function ‘void readinput()’: user.cpp:20:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d", &N, &K ); ^ user.cpp:24:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d", &a, &b ); ^ user.cpp: In function ‘int main()’: user.cpp:71:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "iepuri2.in", "r", stdin ); ^ user.cpp:72:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "iepuri2.out", "w", stdout ); ^