Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:20:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[nod].size(); i++) ^ user.cpp: In function ‘int mdfs(int, int)’: user.cpp:83:25: warning: unused variable ‘t’ [-Wunused-variable] int t = st.top(); ^ user.cpp:119:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:141:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < rez[i].size(); j++) ^ user.cpp:124:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("biconex.in", "r", stdin); ^ user.cpp:125:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("biconex.out", "w", stdout); ^ user.cpp:126:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:129:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a, &b); ^