Compilare: user.cpp: In function ‘void shrink(int, int)’: user.cpp:57:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < V[s].size(); ++ i) ^ user.cpp: In function ‘int main()’: user.cpp:138:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:142:53: 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].t); ^