Compilare: user.cpp: In function ‘void solve()’: user.cpp:46:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < V[i].size(); ++ j) ^ user.cpp:50:72: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int nod = V[i][j], k = 0; k < V[nod].size(); ++ k) ^ user.cpp: In function ‘void read()’: user.cpp:24:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:29:31: 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:76:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^