Submission #1131390

#	Time	Username	Problem	Language	Result	Execution time	Memory
1131390		Luvidi	Aliens (IOI16_aliens)	C++20	25 / 100	2091 ms	22344 KiB

aliens

#include <bits/stdc++.h>
#include "aliens.h"
using namespace std;

long long take_photos(int n, int m, int k, std::vector<int> r, std::vector<int> c) {
    vector<pair<int,int>> tm,st;
    for(int i=0;i<n;i++){
        if(r[i]>c[i])swap(r[i],c[i]);
        tm.push_back({r[i],c[i]});
    }
    sort(tm.begin(),tm.end(),[](pair<int,int> p1,pair<int,int> p2){
        if(p1.first!=p2.first)return p1.first<p2.first;
        return p1.second>p2.second;
    });
    st.push_back({-1,-1});
    for(auto p:tm){
        if(p.second>st.back().second)st.push_back(p);
    }
    n=st.size()-1;
    long long dp[n+1][k+1],a[n+1],h[n+1];
    for(int i=0;i<=n;i++){
        a[i]=st[i].second+1;
        h[i]=st[i].second-st[i].first+1;
    }
    // for(int i=0;i<=n;i++)cout<<a[i]<<' '<<h[i]<<'\n';
    for(int i=1;i<=n;i++)dp[i][0]=1e18;
    for(int i=0;i<=k;i++)dp[0][i]=0;
    for(int j=1;j<=k;j++){
        for(int i=1;i<=n;i++){
            dp[i][j]=1e18;
            for(int p=i-1;p>-1;p--){
                long long x=a[i]-a[p+1]+h[p+1],y=max(0LL,x-a[i]+a[p]);
                // cout<<i<<' '<<j<<' '<<p<<' '<<x<<' '<<y<<'\n';
                dp[i][j]=min(dp[i][j],x*x-y*y+dp[p][j-1]);
            }
        }
    }
    return dp[n][k];
}

Compilation message (stderr)

aliens.h:1:9: warning: #pragma once in main file
    1 | #pragma once
      |         ^~~~
aliens_c.h:1:9: warning: #pragma once in main file
    1 | #pragma once
      |         ^~~~

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