Compilare: main.cpp: In function 'int main()': main.cpp:60:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<query>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 60 | for (nr=0; nr<l[q].size (); nr++) | ~~^~~~~~~~~~~~~ main.cpp:75:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<query>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 75 | for (nr=0; nr<l[q].size (); nr++) | ~~^~~~~~~~~~~~~