百练 2722 学分绩点

题目链接：http://bailian.openjudge.cn/practice/2722

# include <stdio.h>
int main()
{
	int n;
	int a[10],b[10];
	double GPA,t;
	scanf("%d",&n);
	int i;
	for(i=0;i<n;i++)
		scanf("%d",&a[i]);
	for(i=0;i<n;i++)
	{
		scanf("%d",&b[i]);
	}
	double sum1=0,sum2=0;
	for(i=0;i<n;i++)
	{
		if(b[i]>=90&&b[i]<=100)
			t=4.0;
		if(b[i]>=85&&b[i]<=89)
			t=3.7;
		if(b[i]>=82&&b[i]<=84)
			t=3.3;
		if(b[i]>=78&&b[i]<=81)
			t=3.0;
		if(b[i]>=75&&b[i]<=77)
			t=2.7;
		if(b[i]>=72&&b[i]<=74)
			t=2.3;
		if(b[i]>=68&&b[i]<=71)
			t=2.0;
		if(b[i]>=64&&b[i]<=67)
			t=1.5;
		if(b[i]>=60&&b[i]<=63)
			t=1.0;
		if(b[i]<60)
			t=0;
		sum1=sum1+a[i]*t;
		sum2=sum2+a[i];
	}
	GPA=sum1/sum2;
	printf("%.2f\n",GPA);
	return 0;
}