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:49:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < vinv[nod].size (); ++i) { ^ user.cpp: In function ‘void dag()’: 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 ‘void calcDist()’: user.cpp:102:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < dinv[nod].size (); ++i) { ^ user.cpp: In function ‘void rezolva()’: user.cpp:128:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < cap[dmax].size (); ++i) { ^ user.cpp:132:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < d[nod].size (); ++j) { ^ user.cpp:151:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sol.size (); ++i) ^ user.cpp: In function ‘void read()’: user.cpp:25:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &N, &M); ^ 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:157:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("drumuri5.in", "r", stdin); ^ user.cpp:158:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("drumuri5.out", "w", stdout); ^