Compilare: main.cpp: In function 'long long int solve(long long int, long long int)': main.cpp:28:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < points.size(); ++i) { ~~^~~~~~~~~~~~~~~ main.cpp:29:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1 + i; j < points.size(); ++j) { ~~^~~~~~~~~~~~~~~ main.cpp:42:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < points.size(); ++i) { ~~^~~~~~~~~~~~~~~ main.cpp:43:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1 + i; j < points.size() && j - i < 8; ++j) { ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:52:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cmap.in", "r", stdin); ^ main.cpp:53:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cmap.out", "w", stdout); ^ main.cpp:56:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %lld", &x, &y); ^