Compilare: user.cpp: In function ‘int main()’: user.cpp:121:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < v.size()) { ^ user.cpp:123:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j < v.size() && v[j].y == v[i].y) ^ user.cpp:108:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("insula2.in", "r", stdin); ^ user.cpp:109:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("insula2.out", "w", stdout); ^ user.cpp:111:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^ user.cpp:113:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &pct[i].x, &pct[i].y); ^