Compilare: main.cpp: In function 'int main()': main.cpp:40:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | for( i = 1; i < k->second.size(); i++ ){ | ~~^~~~~~~~~~~~~~~~~~ main.cpp:46:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | for( i = 0; i < v.size(); i++ ){ | ~~^~~~~~~~~~ main.cpp:73:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 73 | for( i = 0; i < v.size(); i++ ){ | ~~^~~~~~~~~~