Compilare: main.cpp: In function 'int main()': main.cpp:46:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::deque<std::deque<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | for(j=0; j<q2.size(); j++) | ~^~~~~~~~~~ main.cpp:51:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::deque<std::deque<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for(j=0; j<q2.size(); j++) | ~^~~~~~~~~~ main.cpp:56:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::deque<std::deque<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 56 | for(i=0; i<q2.size(); i++) | ~^~~~~~~~~~ main.cpp:59:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::deque<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 59 | for(j=0; j<q2[i].size(); j++) | ~^~~~~~~~~~~~~ main.cpp:69:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::deque<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 69 | for(i=0; i<q2[ind].size(); i++) | ~^~~~~~~~~~~~~~~