I don´t understand why I get Compilation error when I send the code;

#include <iostream>
#include <math.h>
#include <vector>
using namespace std;

int main()
{
    long long n;

    vector<long long>v;

    while(std::cin >> n){
        v.push_back(n);
    }
    vector<long long>::iterator indice= v.end()-1;

    do{

        std::cout.precision(4);
        std::cout<<fixed<<sqrt(*indice)<<endl;

        indice--;
    }while(indice!= v.begin()-1);


    return 0;
}

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