Compilare: main.cpp: In function 'bool itWorks(int)': main.cpp:47:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < possible.size(); j++) { ~~^~~~~~~~~~~~~~~~~ main.cpp:48:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = j + 1; k < possible.size(); k++) { ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:59:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("segmente.in", "r", stdin); ^ main.cpp:60:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("segmente.out", "w", stdout); ^ main.cpp:63:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp: In member function 'void Point::scan()': main.cpp:12:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^