Compilare: main.cpp: In function 'int main()': main.cpp:57:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | for(int i=0;i<ctc.size();i++) | ~^~~~~~~~~~~ main.cpp:67:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 67 | for(int i=1;i<=ctc.size();i++) | ~^~~~~~~~~~~~ main.cpp:80:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 80 | for(int i=l+1;i<y.size();i++) | ~^~~~~~~~~ main.cpp:86:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 86 | for(int i=l+1;i<x.size();i++) | ~^~~~~~~~~ main.cpp:35:13: warning: unused variable 'i' [-Wunused-variable] 35 | int n,m,i,a,b; | ^