Compilare: main.cpp: In member function 'matrice_patratica matrice_patratica::operator*(const matrice_patratica&) const': main.cpp:24:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | for(int i=0;i<mat.size();i++) | ~^~~~~~~~~~~ main.cpp:26:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | for(int j=0;j<other.mat[i].size();j++) | ~^~~~~~~~~~~~~~~~~~~~ main.cpp:28:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | for(int x=0;x<mat[i].size();x++) | ~^~~~~~~~~~~~~~