Compilare: main.cpp: In function 'std::vector<int> Normalize(std::vector<int>)': main.cpp:25:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < A.size(); ++ i ) { ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:86:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= Lines.size(); ++ i ) ~~^~~~~~~~~~~~~~~ main.cpp:87:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1; j <= Columns.size(); ++ j ) { ~~^~~~~~~~~~~~~~~~~