Compilare: user.cpp: In function ‘int solve(int, int)’: user.cpp:49:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < p.size(); ++ i) ^ user.cpp:50:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = i + 1; j < p.size(); ++ j) ^ user.cpp: In function ‘int main()’: user.cpp:56:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("harta2.in", "r", stdin); ^ user.cpp:57:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("harta2.out", "w", stdout); ^ user.cpp:60:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp: In member function ‘void POINT::read()’: user.cpp:18:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^