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:89:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 89 | if(id[1] < c[1].size() && id[2] < c[2].size()){ | ~~~~~~^~~~~~~~~~~~~ main.cpp:89:37: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 89 | if(id[1] < c[1].size() && id[2] < c[2].size()){ | ~~~~~~^~~~~~~~~~~~~