Submission #341442

#	Time	Username	Problem	Language	Result	Execution time	Memory
341442		bigDuck	Watching (JOI13_watching)	C++14	100 / 100	577 ms	32108 KiB

watching

#include<bits/stdc++.h>
using namespace std;
#define INIT  ios_base :: sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
#define mp make_pair
#define pb push_back
#define ft first
#define sc second
#define ll long long
#define pii pair<int, int>
#define count_bits __builtin_popcount
#define int ll

int t, n, m, k, a[300010], q, p;

int w;
int dp[2010][2010];



void dinamica(){


    for(int i=0; i<=min(n, p); i++){
        dp[0][i]=0;
    }

    for(int i=1; i<=n; i++){
        for(int j=0; j<=min(p, n);  j++){
            dp[i][j]=-1;
        }

        for(int j=i; j<=min(p, n); j++){
            dp[i][j]=dp[i-1][j-1];
        }

        int pt1=i, pt2=i;
        for(int j=i-1; j>=1; j--){
            if( (a[i]-a[j]+1)<=(w) ){
                pt1=j;
            }
            if( (a[i]-a[j]+1)<=(2*w) ){
                pt2=j;
            }
        }

        for(int j=1; j<=min(p, n); j++){
            if(dp[i][j]!=(-1)){
                if( dp[pt1-1][j-1]!=(-1) ){
                    dp[i][j]=min(dp[i][j], dp[pt1-1][j-1]);
                }
            }
            else{
                if( dp[pt1-1][j-1]!=(-1) ){
                    dp[i][j]=dp[pt1-1][j-1];
                }
            }
        }
        for(int j=0; j<=min(p, n); j++){
            if(dp[i][j]!=(-1)){
                if( (dp[pt2-1][j]!=(-1)) ){
                    dp[i][j]=min(dp[i][j], dp[pt2-1][j]+1);
                }
            }
            else{
               if( (dp[pt2-1][j]!=(-1)) ){
                    dp[i][j]=dp[pt2-1][j]+1;
               }
            }
        }
    }


}



bool verificare(){
    for(int i=0; i<=min(p, n); i++){
        if( (dp[n][i]<=q) && (dp[n][i]>(-1) ) ){
            return true;
        }
    }
    return false;
}


void cautare(){

int l=1, r=1000000001, m=(l+r)>>1ll;

while(l<r){
    m=(l+r)>>1ll;
    w=m;
    dinamica();
    if( verificare()  ){
        r=m;
    }
    else{
        l=(m+1);
    }
    m=(l+r)>>1ll;
}
w=m;

}









int32_t main(){
INIT
cin>>n>>p>>q;
for(int i=1; i<=n; i++){
    cin>>a[i];
}
sort(a+1, a+n+1);
cautare();
cout<<w;


return 0;
}

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