Compilare: main.cpp: In function 'int main()': main.cpp:46:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < v.size();i++){ ~~^~~~~~~~~~ main.cpp:10:11: warning: unused variable 'i' [-Wunused-variable] int n,i; ^ main.cpp:40:9: warning: unused variable 'cnt' [-Wunused-variable] int cnt = 0; ^~~