View Code of Problem 3695

#include <stdio.h>
int main()
{
    int t;
    scanf("%d",&t);
    while(t--)
    {
        int n;
        scanf("%d",&n);
        long int a[n];
        a[0]=1;a[1]=2;
       long  int sum=0;
        for(int i=2;i<n;++i)
        {
            a[i]=a[i-1]+a[i-2];
        }
        for(int i=0;i<n;++i)
        {
            sum+=a[i];
        }
        printf("%ld\n",sum);


    }
}

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