Compilare: main.cpp: In function 'll solve(std::vector<long long int>)': main.cpp:34:21: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | for (int i = 1; i < temp.size(); ++i) | ~~^~~~~~~~~~~~~ main.cpp: At global scope: main.cpp:58:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] 58 | main() { | ^~~~