Compilare: main.cpp: In function 'int main()': main.cpp:80:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 80 | for(int i=0;i<ctc.size();i++) | ~^~~~~~~~~~~ main.cpp:93:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 93 | for(int i=1;i<=ctc.size();i++) | ~^~~~~~~~~~~~ main.cpp:40:13: warning: unused variable 'i' [-Wunused-variable] 40 | int n,m,i,a,b; | ^