Compilare: main.cpp: In function 'int main()': main.cpp:34:27: 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(i=0; i<v[x].size(); i++) | ~^~~~~~~~~~~~ main.cpp:55:29: warning: 'void* memset(void*, int, size_t)' clearing an object of type 'class std::vector<std::pair<int, int> >' with no trivial copy-assignment; use assignment or value-initialization instead [-Wclass-memaccess] 55 | memset(v,0,sizeof(v)); | ^ In file included from /usr/include/c++/10/vector:67, from /usr/include/c++/10/queue:61, from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:86, from main.cpp:1: /usr/include/c++/10/bits/stl_vector.h:389:11: note: 'class std::vector<std::pair<int, int> >' declared here 389 | class vector : protected _Vector_base<_Tp, _Alloc> | ^~~~~~