Submission #773405

#	Time	Username	Problem	Language	Result	Execution time	Memory
773405		ttamx	Aliens (IOI16_aliens)	C++14	25 / 100	118 ms	4180 KiB

aliens

#include "aliens.h"
#include<bits/stdc++.h>

using namespace std;

typedef long long ll;

const int N=505;
const int M=1e6+5;
const bool dbg=false;

int l[N],r[N];
ll overlap[N];
int mn[M];
stack<pair<int,int>> s;

long long take_photos(int n, int m, int k, vector<int> R, vector<int> C) {
    for(int i=0;i<m;i++)mn[i]=m;
    for(int i=0;i<n;i++){
        int x=R[i],y=C[i];
        int st=min(x,y),ed=max(x,y);
        mn[ed]=min(mn[ed],st);
    }
    for(int i=0;i<m;i++){
        if(mn[i]==m)continue;
        while(!s.empty()&&s.top().first>=mn[i])s.pop();
        s.emplace(mn[i],i);
    }
    n=s.size();
    for(int i=n;i>=1;i--){
        tie(l[i],r[i])=s.top();
        s.pop();
    }
    for(int i=1;i<n;i++){
        ll res=max(0,r[i]-l[i+1]+1);
        overlap[i]=res*res;
    }
    k=min(k,n);
    vector<vector<ll>> dp(n+1,vector<ll>(k+1,1e18));
    dp[0][0]=0;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=k;j++){
            for(int x=1;x<=i;x++){
                ll sz=r[i]-l[x]+1;
                dp[i][j]=min(dp[i][j],dp[x-1][j-1]+sz*sz-overlap[i]);
            }
        }
    }
    ll ans=1e18;
    for(int i=0;i<=k;i++)ans=min(ans,dp[n][i]);
    return ans;
}

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