#include "stdio.h"
int main()
{
        long n;
        int a[100004]={0},b,c;
        long i;

        scanf("%ld",&n);
        for(i=0;i<n;i++){
                scanf("%d%d",&b,&c);
                a[i]=b+c;
        }
        for(i=n-1;i>0;i--){
                if(a[i]>9){
                        a[i-1]++;
                        a[i]%=10;
                }
        }
        printf("%d",a[0]%10);
        for(i=1;i<n;i++)
                printf("%d",a[i]);
        putchar('\n');
        return 0;

}

帮忙看看,在下的以上程序哪里有问题?

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