Compilare: main.cpp: In function 'void ReadInput(std::istream&)': main.cpp:15:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < N; i++) { ~~^~~ main.cpp:20:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < M; i++) { ~~^~~ main.cpp: In function 'void BuildCartesianTree()': main.cpp:27:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < N; i++) { ~~^~~ main.cpp: In function 'void Precompute()': main.cpp:72:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j == block_size) { ~~^~~~~~~~~~~~~ main.cpp:81:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < block_nr; i++) { ~~^~~~~~~~~~ main.cpp:83:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p >= block_nr) { ~~^~~~~~~~~~~ main.cpp:94:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j == block_size) { ~~^~~~~~~~~~~~~ main.cpp:105:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int block = 0; block < block_nr; block++) { ~~~~~~^~~~~~~~~~ main.cpp:109:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int l = 0; l < block_size; l++) { ~~^~~~~~~~~~~~ main.cpp:111:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int r = l + 1; r < block_size; r++) { ~~^~~~~~~~~~~~ main.cpp:113:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (block * block_size + r < nr) ~~~~~~~~~~~~~~~~~~~~~~~^~~~ main.cpp: In function 'void InitializeTree()': main.cpp:160:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < parent.size(); i++) { ~~^~~~~~~~~~~~~~~