Compilare: main.cpp: In function 'int main()': main.cpp:32:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | while(x1<fr[i]&&x2<b[i].size()) | ~~^~~~~~~~~~~~ main.cpp:44:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | while(x2<b[i].size()) | ~~^~~~~~~~~~~~ main.cpp:53:27: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 53 | if(c[i].size()==s) | ~~~~~~~~~~~^~~