Compilare: main.cpp: In function 'int main()': main.cpp:37:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | for (i=0; i<sol.size()-1; i++) | ~^~~~~~~~~~~~~ main.cpp: In function 'int grade_pare()': main.cpp:64:9: warning: 'start' may be used uninitialized [-Wmaybe-uninitialized] 64 | {int i, start; | ^~~~~