记录编号	569051	评测结果	AAAAAAAAAA
题目名称	[USACO Feb05]愤怒的牛	最终得分	100
用户昵称	lihaoze	是否通过	通过
代码语言	C++	运行时间	0.036 s
提交时间	2022-02-14 15:52:29	内存使用	1.22 MiB

#include <iostream>
#include <vector>
#include <cstring>
#include <string>
#include <algorithm>
#define OPEN(_x) freopen(#_x".in", "r", stdin); freopen(#_x".out", "w", stdout)
#define ABS(_x) ((_x)<0?(-(_x)):(_x))
#define MAX(_a, _b) ((_a)<(_b)?(_b):(_a))
#define MIN(_a, _b) ((_a)>(_b)?(_b):(_a))
#define fi first
#define se second

using namespace std;

typedef long long ll;
typedef pair<int, int> PII;

namespace IO{
    template<typename T>
    inline T read() {
        T ret=0, sig=1; char ch=0;
        while(ch<'0'||ch>'9') { if(ch=='-') sig=-1; ch=getchar(); }
        while(ch>='0'&&ch<='9') { ret=(ret<<1)+(ret<<3)+ch-'0'; ch=getchar(); }
        return ret*sig;
    }
    template<typename T>
    inline void read(T &x) {
        T ret=0, sig=1; char ch=0;
        while(ch<'0'||ch>'9') { if(ch=='-') sig=-1; ch=getchar(); }
        while(ch>='0'&&ch<='9') { ret=(ret<<1)+(ret<<3)+ch-'0'; ch=getchar(); }
        x = ret*sig;
    }
    template<typename T>
    inline void write(T x) {
        if(x<0) putchar('-'), x=-x;
        T stk[100], tt=0;
        do stk[tt++]=x%10, x/=10; while(x);
        while(tt) putchar(stk[--tt]+'0');
    }
};

const int N = 100010;
int n, c;
int a[N];

inline bool check(int x) {
    int cnt = 1, now = 1;
    for(register int i = 2; i<=n; ++i)
        if(a[i] - a[now] >= x) cnt++, now = i;
    return cnt >= c;
}

int main() {
    #ifdef DEBUG
    OPEN(test);
    #endif
    OPEN(angrycow);
    IO::read(n), IO::read(c);
    for(register int i = 1; i<=n; ++i) IO::read(a[i]);
    sort(a+1, a+1+n);
    int l = 1, r = a[n];
    while(l < r) {
        int mid = l+r+1>>1;
        if(check(mid)) l = mid;
        else r = mid-1;
    }
    IO::write(r);
    return 0;
}