#include <stdio.h>#include <stdlib.h>int main(){int a,b;int R;while(scanf("%d%d",&a,&b)==2){int s=a+b;printf("%d\n",s);R = ss/(2b)-a;printf("%d\n",R);if(a==0||b==0){return 0;}}}
一元二次方程 ,直接反向逆推计算,然后输出