hdu 5095 Linearization of the kernel functions in SVM 坑多的水题 细节

题目链接：http://acm.hdu.edu.cn/showproblem.php?pid=5095

几个坑

系数为正负1是不输出系数（比赛时wa到死）

0时不输出但全零时要输出0

加号和减号的控制

#include <cstring>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <algorithm>
#include <iostream>
#include <cstdio>
#include <stack>
#include <vector>
#include <queue>
#include <map>
#include <set>

using namespace std;

const int maxn = 110;

int a[maxn];
const char ch[] = "pqruvwxyz";

int main()
{
    //freopen("in.txt", "r", stdin);

    int T;
    scanf("%d", &T);
    while(T--)
    {
        for(int i = 0; i < 10; i++)
            scanf("%d", &a[i]);

        bool flag = false;
        for(int i = 0; i < 9; i++)
        {
            if(a[i] > 0)
            {
                if(flag)
                    printf("+");

                if(a[i] == 1)
                    printf("%c", ch[i]);
                else
                    printf("%d%c", a[i], ch[i]);

                flag = true;
            }
            else if(a[i] < 0)
            {
                if(a[i] == -1)
                    printf("-%c", ch[i]);
                else
                    printf("%d%c", a[i], ch[i]);

                flag = true;
            }
        }

        if(!flag)
        {
            printf("%d", a[9]);
        }
        else
        {
            if(a[9] > 0)
                printf("+%d", a[9]);
            else if(a[9] < 0)
                printf("%d", a[9]);
        }
        printf("\n");

    }
    return 0;
}