Compilare: main.cpp: In function 'int main()': main.cpp:70:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 70 | for ( i = 1; i < p[x].size(); i++ ) | ~~^~~~~~~~~~~~~ main.cpp:78:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 78 | for ( i = 1; i <= p[x].size(); i++ ) { | ~~^~~~~~~~~~~~~~ main.cpp:88:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 88 | for ( i = 1; i < p[x].size(); i++ ) | ~~^~~~~~~~~~~~~