Nine degrees oj1002

Enigmatic grading, what's the standard?

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#include"iostream"#include"stdlib.h"#include"stdio.h"#include<iomanip>#include<cmath>using namespace std;int max(int a, int b, int c){    if (a >=b)    {        if (a >= c)            return a;        else        {            return c;        }    }    else    {        if (b >= c)            return b;        else        {            return c;        }    }}intmain( ){    int full_mark, tolerence, G1, G2, G3, Gj;    double resu;    while (cin >> full_mark >> tolerence >> G1 >> G2 >> G3 >> Gj)    {        if (abs(G1 - G2) <= tolerence)            resu =(double) (G1 + G2) / 2.0;        else if (abs(G3 - G1) > tolerence && abs(G3 - G2) <= tolerence)        {            resu = (double)(G3 + G2) / 2.0;        }        else if (abs(G3 - G2) > tolerence && abs(G3 - G1) <= tolerence)        {            resu = (double)(G3 + G1) / 2.0;        }        else if (abs(G3 - G1) <= tolerence && abs(G3 - G2) <= tolerence)            resu = max(G1, G2, G3)+1.0-1.0;        else        {            resu = (double)Gj + 1.0 - 1.0;        }        printf("%.1lf\n", resu);    }    return 0;}

Nine degrees oj1002