C++: Custo IA MSE

#include <iostream>
#include<math.h>

using namespace std;

int main()
{
    float saida[]={0.5,0.8,0.7,0.6,0.9};
    float resposta[]={1,0,0,0,0,0};
    float custo[]={0.0};
    float MSE = 0;

    int i;

    for(i=0;i<5;i++){
        custo[i]=pow((saida[i]-resposta[i]),2);
        MSE += custo[i];
        cout << custo[i] << endl;
    }
        cout << MSE << endl;
    return 0;
}