Compilare: main.cpp: In function 'void dfs(int)': main.cpp:10:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nod].size();i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:31:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(i=1;i<=n;i++) ^~~ main.cpp:34:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' while(!st.empty()) ^~~~~ main.cpp:24:15: warning: unused variable 'j' [-Wunused-variable] int n,m,i,j,a,b; ^ main.cpp:22:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sortaret.in","r",stdin); ^ main.cpp:23:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sortaret.out","w",stdout); ^ main.cpp:25:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ main.cpp:28:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^