Compilare: main.cpp: In function 'double solve(int, int)': main.cpp:39:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size (); i++) for (int j = i + 1; j < min ((int)v.size (), i + 10); j++) ans = min (ans, dist (v[i], v[j])); ~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:44:36: 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:45:38: 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); ^