Submission #170657

#	Time	Username	Problem	Language	Result	Execution time	Memory
170657		mdn2002	Watching (JOI13_watching)	C++14	0 / 100	1080 ms	33312 KiB

watching

#include<bits/stdc++.h>
using namespace std;
const long long mod=998244353;
long long n,a,b,sum,c[2003],dp[2050][2050];
long long f(int x,int y,int z)
{
    if(y>a)return 1e12;
    if(x==n)return 0;
    if(dp[x][y]!=-1)return dp[x][y];
    long long mx=1e12;
    for(int i=x;i<n;i++)
    {
        for(int j=i;j<n;j++)
        {
            if(c[i]-c[x]+1>z*2)break;
            if(c[i]-c[x]+1<=z)mx=min(mx,f(i+1,y+1,z));
            else mx=min(mx,f(i+1,y,z)+1);
        }
    }
    return dp[x][y]=mx;
}
bool ck(int x)
{
    int as=0,bs=0;
    memset(dp,-1,sizeof dp);
    if(f(0,0,x)<=b)return 1;
    else return 0;
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    //freopen(".in","r",stdin);
    //freopen(".out","w",stdout);
    cin>>n>>a>>b;
    for(int i=0;i<n;i++)cin>>c[i];
    int l=1,r=1e9+1,mid;
    sort(c,c+n);
    while(l<r)
    {
        mid=(l+r)/2;
        if(ck(mid))r=mid;
        else l=mid+1;
    }
    cout<<l;
}

Compilation message (stderr)

watching.cpp: In function 'bool ck(int)':
watching.cpp:24:9: warning: unused variable 'as' [-Wunused-variable]
     int as=0,bs=0;
         ^~
watching.cpp:24:14: warning: unused variable 'bs' [-Wunused-variable]
     int as=0,bs=0;
              ^~

• Subtask 1: 0 / 50
• Subtask 2: 0 / 50