Compilare: main.cpp: In function 'void NormalizeCoordinates()': main.cpp:46:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sortX.size(); ++i) { normX[sortX[i]] = i; } ~~^~~~~~~~~~~~~~ main.cpp:47:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sortY.size(); ++i) { normY[sortY[i]] = i; } } ~~^~~~~~~~~~~~~~ main.cpp: In function 'void BuildDistances()': main.cpp:66:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int x = 0; x < normX.size(); ++x) { ~~^~~~~~~~~~~~~~ main.cpp:67:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int y = 0; y < normY.size(); ++y) { ~~^~~~~~~~~~~~~~ main.cpp: In function 'void UpdateFenwick(int, int)': main.cpp:82:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (++pos; pos <= fenwick.size(); pos += (pos & -pos)) { ~~~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'void SolveDiagonal()': main.cpp:88:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < diagonal.size(); ++i) { ~~^~~~~~~~~~~~~~~~~ main.cpp:100:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (nextP < diagonal.size()) { ~~~~~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:145:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rectangles.in", "r", stdin); ^ main.cpp:146:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rectangles.out", "w", stdout); ^