题目1002：Grading

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

代码

#include <iostream>#include <stdio.h>//#include <cmath>#include <cstdlib>using namespace std;int main(){    int P,T,G1,G2,G3,GJ;    float GF;    while(scanf("%d %d %d %d %d %d",&P,&T,&G1,&G2,&G3,&GJ)!=EOF)    {        //cout << P << " "<<T<< " "<<G1<< " "<<G2<< " "<<G3<< " "<<GJ << endl;        if(abs(G1-G2) <= T)        {            GF = (float)(G1*1.0 + G2*1.0) /2;            printf("%.1lf\n",GF);        } else if(abs(G3-G2) <= T && abs(G3-G1) <= T)        {            float temp;            if(G1 > G2)            {                temp = G1;                if(G1 < G3)                    temp = G3;            } else            {                temp = G2;                if(G2 < G3)                    temp = G3;            }           printf("%.1lf\n",temp);        } else if(abs(G3-G2) <= T || abs(G3-G1) <= T)        {            if(abs(G3-G2) <= T)            {                GF = (float)(G3 + G2)/2;                printf("%.1lf\n",GF);            }            if(abs(G3-G1) <= T)            {                GF = (float)(G3 + G1)/2;                printf("%.1lf\n",GF);            }        } else        {            GF = (float)GJ;            printf("%.1lf\n",GF);        }    }    return 0;}

注意：

printf("%.1lf\n",GF);若GF为整数则输出零 需要强制类型转换