九度oj 1002 Grading 2011年浙江大学计算机及软件工程研究生机试真题

#include<iostream>
#include<queue>
#include<cstdio>
#include<cstring>
#include<cmath>
#include<algorithm>
using namespace std;
int map[15][15];
int main(){
    int P,T,G1,G2,G3,GJ;
    while(cin>>P>>T>>G1>>G2>>G3>>GJ){
        if(abs(G1-G2)<=T){
            printf("%.1lf
",1.0*(G1+G2)/2);
        }
        else{
            int m1=abs(G1-G3);
            int m2=abs(G3-G2);
            if(m1<=T&&m2<=T){
                int max=G1>G2?G1:G2;
                max=max>G3?max:G3;
                printf("%.1lf
",max*1.0);
            }
            else{
                if(m1<=T||m2<=T){
                    if(m1>m2){
                        printf("%.1lf
",(G3+G2)*1.0/2);
                    }
                    else{
                        printf("%.1lf
",(G3+G1)*1.0/2);
                    }
                }
                else{
                    printf("%.1lf
",GJ*1.0);
                }
            }
        }
    }
    return 0;
}

时间限制：1 秒

内存限制：32 兆

特殊判题：否

提交：16128

解决：4162

题目描述：

    Grading hundreds of thousands of Graduate Entrance Exams is a hard work. It is even harder to design a process to make the results as fair as possible. One way is to assign each exam problem to 3 independent experts. If they do not agree to each other, a judge is invited to make the final decision. Now you are asked to write a program to help this process.
    For each problem, there is a full-mark P and a tolerance T(<P) given. The grading rules are:
    • A problem will first be assigned to 2 experts, to obtain G1 and G2. If the difference is within the tolerance, that is, if |G1 - G2| ≤ T, this problem's grade will be the average of G1 and G2.
    • If the difference exceeds T, the 3rd expert will give G3.
    • If G3 is within the tolerance with either G1 or G2, but NOT both, then this problem's grade will be the average of G3 and the closest grade.
    • If G3 is within the tolerance with both G1 and G2, then this problem's grade will be the maximum of the three grades.
    • If G3 is within the tolerance with neither G1 nor G2, a judge will give the final grade GJ.

输入：

    Each input file may contain more than one test case.
    Each case occupies a line containing six positive integers: P, T, G1, G2, G3, and GJ, as described in the problem. It is guaranteed that all the grades are valid, that is, in the interval [0, P].

输出：

    For each test case you should output the final grade of the problem in a line. The answer must be accurate to 1 decimal place.

样例输入：

20 2 15 13 10 18

样例输出：

14.0

来源：

2011年浙江大学计算机及软件工程研究生机试真题

分析：

读懂题意即可