Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:88:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++) ^ user.cpp: In function ‘void DFS2(int, int)’: user.cpp:121:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < V[node].size(); i++) ^ user.cpp:129:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Val.size(); i++) ^ user.cpp:131:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++) ^ user.cpp: In function ‘void Read()’: user.cpp:69:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ user.cpp:73:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &c); ^ user.cpp:79:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &Query[i]); ^ user.cpp: In function ‘int main()’: user.cpp:147:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("regat.in", "r", stdin); ^ user.cpp:148:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("regat.out", "w", stdout); ^