Compilare: main.cpp: In function 'int main()': main.cpp:34:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | for(int i=0;i<x[a].size();i++) | ~^~~~~~~~~~~~ main.cpp:22:19: warning: unused variable 'p' [-Wunused-variable] 22 | int n,m,i,j,c,p; | ^