Compilare: main.cpp: In function 'int main()': main.cpp:69:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 69 | for ( i = 0; i < sorted_columns[j].size(); i++ ) { | ~~^~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:56:50: warning: unused variable 'minn2' [-Wunused-variable] 56 | int cer, n, m, k1, k2, i, j, val, sum, minn, minn2, sum2, val2, j1, j2; | ^~~~~