Compilare: user.cpp: In function ‘void solve()’: user.cpp:80:21: warning: unused variable ‘numg’ [-Wunused-variable] int i, j, k, s, numg; ^ user.cpp: In function ‘int main()’: user.cpp:148:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("overlap.in", "r", stdin); ^ user.cpp:149:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("overlap.out", "w", stdout); ^ user.cpp:151:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &n); ^ user.cpp:154:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &P [i].x, &P [i].y); ^