trading.cpp: In function 'int main()':
trading.cpp:25:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
25 | for(j=0;j<v1[i].size();j++)s.insert(v1[i][j]);
| ~^~~~~~~~~~~~~
trading.cpp:38:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
38 | for(j=0;j<v2[i].size();j++)s.erase(v2[i][j]);
| ~^~~~~~~~~~~~~