1 int work(int o,char *O,int I) { // 手动开根，试商  2     char c, *D=O ; 3     if(o>0) { 4         for(l=0;D[l];D[l++]-=10) { 5             D[l++]-=120; 6             D[l]-=110; 7             while(!work(0,O,l)) D[l]+=20; 8             putchar((D[l]+1032)/20); 9         }10         putchar('\n');11     }12     else {13         c=o+(D[I]+82)%10-(I>l/2)*(D[I-l+I]+72)/10-9;14         D[I]+=I<0 ? 0 : !(o=work(c/10,O,I-1))*((c+999)%10-(D[I]+92)%10);15     }16     return o;17 }18 int main() {19     char s[205];s[0]='0';20     scanf("%s",s+1);21     if(strlen(s)%2 == 1) work(2,s+1,0);22     else work(2,s,0);23 }