TakeOff Mock Fall '21

#include<stdio.h>


int main(){
    long unsigned int N =0, Q =0, i=0, j=0;
    long unsigned int l =0, r =0;
    long long unsigned sum = 0;
    double avg = 0;
    scanf("%lu %lu",&N, &Q);
    int A[N];
    for(i=0; i<N; i++){
        scanf("%d",&A[i]);
    }
    for(i=0; i<Q; i++){
        scanf("%lu %lu",&l, &r);

        for(j=l-1; j<r; j++){
            sum += A[j];
        }

        avg = (sum/(r-l));
        printf("%.2lf\n",avg);
        sum = 0; avg = 0;
    }
    return 0;
}