Compilare: main.cpp: In function 'void test_case()': main.cpp:37:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | for( i = 0; i < v.size(); ++i ) | ~~^~~~~~~~~~ main.cpp:38:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for( j = 1 + i; j < v.size(); ++j ) | ~~^~~~~~~~~~ main.cpp:43:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | for( i = 0; i < sol.size(); ++i ) | ~~^~~~~~~~~~~~