Compilare: main.cpp: In function 'void NormalizePoints()': main.cpp:41:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < max(sortX.size(), sortY.size()); ++i) { ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:42:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < sortX.size()) { normX[sortX[i]] = i; } ~~^~~~~~~~~~~~~~ main.cpp:43:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < sortY.size()) { normY[sortY[i]] = i; } } } ~~^~~~~~~~~~~~~~ main.cpp: In function 'void BuildLengths()': main.cpp:61:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int x = 0; x < sortX.size(); ++x) { ~~^~~~~~~~~~~~~~ main.cpp:62:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int y = 0; y < sortY.size(); ++y) { ~~^~~~~~~~~~~~~~ main.cpp: In function 'void Update(int, short int)': main.cpp:71:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (++pos; pos <= bit.size(); pos += (pos & -pos)) { ~~~~^~~~~~~~~~~~~ main.cpp: In function 'void SolveDiagonal()': main.cpp:86:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < diagonal.size(); ++i) { ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'void BuildDiagonals()': main.cpp:99:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int x = 0; x < sortX.size(); ++x) { ~~^~~~~~~~~~~~~~ main.cpp:100:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int y = 0; y < sortY.size(); ++y) { ~~^~~~~~~~~~~~~~ main.cpp:104:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0, j = 0; i < sortPoints.size(); i = j) { ~~^~~~~~~~~~~~~~~~~~~ main.cpp:106:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (; j < sortPoints.size() and sortPoints[i].first - sortPoints[i].second == sortPoints[j].first - sortPoints[j].second; ++j) { ~~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void ReadInput()': main.cpp:26:38: 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:27:40: 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); ^