Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:36:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[nod].size (); ++i) { ^ user.cpp: In function ‘void dfsInv(int)’: user.cpp:50:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < vinv[nod].size (); ++i) { ^ user.cpp: In function ‘void ctc()’: user.cpp:80:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[nod].size (); ++i) { ^ user.cpp: In function ‘int din(int)’: user.cpp:120:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= d[nod].size (); ++i, lin ^= 1) { ^ user.cpp:135:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘void citire()’: user.cpp:25:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d%d", &N, &M, &K); ^ user.cpp:27:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &x, &y); ^ user.cpp: In function ‘int main()’: user.cpp:138:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("dep.in", "r", stdin); ^ user.cpp:139:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("dep.out", "w", stdout); ^