Compilare: main.cpp: In function 'int main()': main.cpp:71:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 71 | for(int j=0;j<a[i].size();j++) | ~^~~~~~~~~~~~ main.cpp:93:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 93 | for(int i=0;i<b[x].size();i++) | ~^~~~~~~~~~~~ main.cpp:116:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 116 | for(int i=0;i<b[x].size();i++) | ~^~~~~~~~~~~~