Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:21:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[n].size(); i++) ^ user.cpp: In function ‘void dfst(int)’: user.cpp:31:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < t[n].size(); i++) ^ user.cpp: In function ‘void ctc(int)’: user.cpp:40:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < st.size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:72:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < rez[i].size(); j++) ^ user.cpp:52:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("retele.in", "r", stdin); ^ user.cpp:53:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("retele.out", "w", stdout); ^ user.cpp:54:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:58:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a, &b); ^