Compilare: main.cpp: In function 'void solve()': main.cpp:64:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | for(i=0;i<pv.size();i++) | ~^~~~~~~~~~ main.cpp:66:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | for(j = 0; j < v[pv[i].second].size(); j++) | ~~^~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:25:13: warning: unused variable 'ok' [-Wunused-variable] 25 | int i,j,ok,t1,t2,lv=1,x; | ^~ main.cpp:25:19: warning: unused variable 't2' [-Wunused-variable] 25 | int i,j,ok,t1,t2,lv=1,x; | ^~