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自己想了个办法处理关于9的问题#include <cstdio>
#include <string.h>
using namespace std;
int main()
{
char buf[2000];
while(scanf("%s",buf),(buf[0]!='0')) {
int len=strlen(buf);
int tot=0;
for(int i=0;i<len;i++)
tot+=buf[i]-'0';
printf("%d\n",(tot-1)%9+1);
}
getchar();getchar();
return 0;
}
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