Compilare: main.cpp: In function 'int main()': main.cpp:67:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 67 | for(j = 0; j < c[i].size(); j ++){ | ~~^~~~~~~~~~~~~ main.cpp:74:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 74 | for(j = 0; j < sum[i].size(); j ++){ | ~~^~~~~~~~~~~~~~~ main.cpp:84:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 84 | for(id[3] = k1 + k2 - k; id[3] < c[3].size(); id[3] ++){ | ~~~~~~^~~~~~~~~~~~~ main.cpp:30:27: warning: unused variable 'nr' [-Wunused-variable] 30 | int n, i, j, k1, k2, k, nr, x, maxv; | ^~ main.cpp:30:31: warning: unused variable 'x' [-Wunused-variable] 30 | int n, i, j, k1, k2, k, nr, x, maxv; | ^