hdu5742——It's All In The Mind（模拟）-白红宇

hdu5742——It's All In The Mind（模拟）

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发布时间：2019-05-10

本文共 1373 字，大约阅读时间需要 4 分钟。

Problem Description

Professor Zhang has a number sequence . However, the sequence is not complete and some elements are missing. Fortunately, Professor Zhang remembers some properties of the sequence:

For every , .

The sequence is non-increasing, i.e. .

The sum of all elements in the sequence is not zero.

Professor Zhang wants to know the maximum value of among all the possible sequences.

Input

There are multiple test cases. The first line of input contains an integer , indicating the number of test cases. For each test case:

The first contains two integers and – the length of the sequence and the number of known elements.

In the next lines, each contains two integers and , indicating that .

Output

For each test case, output the answer as an irreducible fraction “/”, where , are integers, .

Sample Input

2 0

3 1

Sample Output

1/1

200/201

题意很简单，前两个数要尽可能大，后面的数要尽可能小，序列又是非递增的，最大值为200

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            #define INF 0x3f3f3f3f#define MAXN 1010#define mod 1000000007using namespace std;long long gcd(long long a,long long b){ if(b==0) return a; else return gcd(b,a%b);}int a[MAXN];int main(){ int t,n,m,x,y; scanf("%d",&t); while(t--) { memset(a,-1,sizeof(a)); scanf("%d%d",&n,&m); if(m==0) { printf("1/1\n"); continue; } for(int i=0; i