Compilare: main.cpp: In function 'double dei(int, int)': main.cpp:35:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < points.size(); ++i) { ~~^~~~~~~~~~~~~~~ main.cpp:36:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i + 1; j < points.size(); ++j) { ~~^~~~~~~~~~~~~~~ main.cpp:50:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < points.size(); ++i) { ~~^~~~~~~~~~~~~~~ main.cpp:51:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i + 1; j < points.size(); ++j) { ~~^~~~~~~~~~~~~~~ main.cpp:30:48: warning: unused variable 'ri_p' [-Wunused-variable] int len = ri - lo + 1, mid = (lo + ri) >> 1, ri_p, lo_p; ^~~~ main.cpp:30:54: warning: unused variable 'lo_p' [-Wunused-variable] int len = ri - lo + 1, mid = (lo + ri) >> 1, ri_p, lo_p; ^~~~ main.cpp: In function 'int main()': main.cpp:59:33: 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:60:35: 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); ^