Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:22:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < Edge[X].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:72:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("heavypath.in","r",stdin); ^ user.cpp:73:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("heavypath.out","w",stdout); ^ user.cpp:75:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &N, &M); ^ user.cpp:77:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &Value[i]); ^ user.cpp:80:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &X, &Y); ^ user.cpp:105:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &O, &X, &Y); ^ user.cpp: In function ‘int query(std::vector<int>&, int, int, int, int, int)’: user.cpp:60:7: warning: ‘Q’ may be used uninitialized in this function [-Wmaybe-uninitialized] int Q, M = (L + R) / 2; ^