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- #include<stdio.h>
- int main()
- {
- int T;
- scanf("%d",&T);
- int i;
- int count=0;
- int x,y,a,b;
- for(i=0;i<T;i++)
- {
- scanf("%d%d%d%d",&x,&y,&a,&b);
- }
- while(x<y)
- {
- x=x+a;
- y=y-b;
- count++;
- }
- if(x-y==0)
- printf("%d",count);
- else
- printf("-1");
- return 0;
- }
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