Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:23:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<V[nod].size();i++) ^ user.cpp: In function ‘void calc()’: user.cpp:61:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=2;i<L.size()-1;i++) ^ user.cpp:69:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=2;i<L.size()-1;i++) ^ user.cpp:77:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=2;i<L.size()-1;i++) ^ user.cpp:85:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=2;i<L.size()-1;i++) ^ user.cpp: In function ‘int verif(int)’: user.cpp:105:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<sp.size();i++) ^ user.cpp:110:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<V[sp[i]].size();j++) ^ user.cpp:117:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<lant.size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:135:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("metrou2.in","r",stdin); ^ user.cpp:136:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:140:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&val[i]); ^ user.cpp:146:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^