Compilare: main.cpp: In function 'int main()': main.cpp:46:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | for(int j = 0;j < pr.size();++j) | ~~^~~~~~~~~~~ main.cpp:51:41: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for(int k = 0;k < tmp.size();++k) | ~~^~~~~~~~~~~~ main.cpp:57:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | for(int j = 0;j < pr.size();++j) | ~~^~~~~~~~~~~