Submission #619877

#	Time	Username	Problem	Language	Result	Execution time	Memory
619877		A_D	Aliens (IOI16_aliens)	C++14	25 / 100	140 ms	4692 KiB

aliens

#include "aliens.h"

#include <bits/stdc++.h>

using namespace std;

const int N=5e2+11;
const long long LINF = 1e18;

long long dp[N][N];
pair<long long,long long> a[N];
pair<long long,long long> b[N];

long long take_photos(int n, int m, int k, vector<int> r, vector<int> c) {

    vector<pair<long long,long long>> vec;
    for(int j=1;j<=n;j++){
        dp[0][j]=1e18;
        dp[j][0]=1e18;
    }

    for(int i=0;i<n;i++){
        if(r[i]<c[i])swap(r[i],c[i]);
        a[i+1]={r[i],c[i]};
    }
    sort(a+1,a+n+1);
    pair<long long,long long> lst=a[n];
    vec.push_back(lst);
    for(int i=n-1;i>=1;i--){
        if(a[i].second>=lst.second){
            a[i]={-1,-1};
        }
        else{
            lst=a[i];
            vec.push_back(lst);
        }
    }
    reverse(vec.begin(),vec.end());
    n=vec.size();
    for(int i=0;i<n;i++){
        a[i+1]=vec[i];
    }
    a[0] = {-1,-1};
    for(int i=1;i<=n;i++){
        for(int j=1;j<=k;j++){
            long long ret=1e18;
            for(int h=i;h>=1;h--){

                long long u=(a[i].first-a[h].second+1)*(a[i].first-a[h].second+1) + dp[h-1][j-1];
                long long f=0;
                if(a[h-1].first>=a[h].second){
                    f = (a[h-1].first-a[h].second+1)*(a[h-1].first-a[h].second+1);
                }
                ret=min(ret,u-f);
            }
            dp[i][j]=ret;
        }
    }

    long long ret=1e18;
    for(int i=1;i<=k;i++){
        ret=min(ret,dp[n][i]);
    }
    return ret;

}

• Subtask 1: 4 / 4
• Subtask 2: 12 / 12
• Subtask 3: 9 / 9
• Subtask 4: 0 / 16
• Subtask 5: 0 / 19
• Subtask 6: 0 / 40