Compilare: main.cpp: In function 'int main()': main.cpp:161:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<triunghi>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 161 | for(int k=0; k<up.size(); k++) | ~^~~~~~~~~~ main.cpp:168:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<triunghi>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 168 | if(poz!=down.size()) | ~~~^~~~~~~~~~~~~