Compilare: main.cpp: In function 'int main()': main.cpp:62:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 62 | for (i=0; i<sol.size (); i++) | ~^~~~~~~~~~~~ main.cpp:64:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | if (i<sol.size ()+1&&sol[i]==sol[i+1]) | ~^~~~~~~~~~~~~~