Compilare: main.cpp: In function 'void rez(int, int)': main.cpp:49:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<el>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 49 | for(int i=0;i<s.size()-1;++i) | ~^~~~~~~~~~~ main.cpp:51:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<el>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for(int j=i+1;j<s.size();++j) | ~^~~~~~~~~