大数加法递推

#include<stdio.h>
#include<string.h>
#include<algorithm>
using namespace std;

int sum[100][10000];

int main()
{
	int a,b,c,m,n,q;
	while(~scanf("%d%d%d",&a,&b,&c)){
		if(a==0&&b==0&&c==0)
		{
			printf("0\n");
			continue;
		}
		memset(sum,sizeof(sum));
		m = n = q = 0;
		while(a){
			sum[0][m++] =a %10;
			a /= 10;
		}
		while(b){
			sum[1][n++] = b%10;
			b /= 10;
		}
		while(c){
			sum[2][q++] = c%10;
			c /= 10;
		}
		int i,j;
		for(int i = 3;i < 100; i++){
			int x=0,y=0;
			for( j = 0;j <= 1000; j++ ){
				y =x+ sum[i-1][j]+sum[i-2][j]+sum[i-3][j];
				sum[i][j]=y%10;
				x=y/10;
			}
	}
	int t;
		for( t = 100;t >= 0;t--){
			if(sum[99][t])
				break;
		}
		for(;t>=0;t--)
		printf("%d",sum[99][t]);
		printf("\n");
	}
	
return 0;
}