Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:42:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < V[x].size(); ++ i) ^ user.cpp: In function ‘void solve()’: user.cpp:157:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < Circ[i].size(); ++ j) ^ user.cpp: In function ‘void read()’: user.cpp:33:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:35:53: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &v[i].x, &v[i].y, &v[i].r); ^