纳尼(⊙o⊙)？36分？？？

CPP

#include<bits/stdc++.h>
using namespace std;
int main(){
	double a,b;
	cin>>a;
	if(0<=a||a<5) b=0-a+2.5;
	else if(5<=a||a<10) b=2-1.5*(a-3)*(a-3);
	else if(10<=a||a<20) b=a/2-1.5;
	printf("%.3lf",b);
	return 0;
}

测试点信息 4ms/788.00KB WA #1 Wrong Answer.wrong answer On line 1 column 2, read 5, expected 2. 4ms/836.00KB

WA #2 Wrong Answer.wrong answer On line 1 column 1, read -, expected 3. 4ms/788.00KB

WA #3 Wrong Answer.wrong answer On line 1 column 1, read -, expected 5. 4ms/788.00KB

AC #4 Accepted, 得分 16.ok accepted 4ms/788.00KB

WA #5 Wrong Answer.wrong answer On line 1 column 2, read 2, expected 4. 4ms/788.00KB

AC #6 Accepted, 得分 20.ok accepted

纳尼(⊙o⊙)？36分？？？

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纳尼(⊙o⊙)？36分？？？