Submission #1021999

#	Time	Username	Problem	Language	Result	Execution time	Memory
1021999		vjudge1	Aliens (IOI16_aliens)	C++17	0 / 100	1 ms	2396 KiB

aliens

#include <bits/stdc++.h>
#define ent '\n'

typedef long long ll;
using namespace std;
const int maxn = 1e5+12;

ll dp[1005][505];
int l[maxn];

long long take_photos(int n, int m, int k, vector<int> r, vector<int> c){
    for(int i=1;i<=m;i++){
        l[i] = i+1;
    }
    for(int i=0;i<n;i++){
        if(r[i] < c[i]){
            swap(r[i], c[i]);
        }
        l[r[i]+1] = min(l[r[i]+1], c[i]+1);
    }
    for(int i=1;i<=m;i++){
        for(int j=0;j<=k;j++){
            dp[i][j] = 1e12;
        }
    }
    for(int i=1;i<=m;i++){
        if(l[i] > i){
            continue;
        }
        int mn = 1e9;
        for(int j=i;j>=1;j--){
            if(l[j] >= mn) continue;
            mn = min(mn, l[j]);
            for(int t=1;t<=k;t++){
                ll val = dp[j-1][t-1] + (i - mn + 1) * 1ll * (i - mn + 1);
                if(mn <= j-1) val -= (j - mn) * 1ll * (j - mn);
                dp[i][t] = min(dp[i][t], val);
            }
        }
    }
    for(int i=m;i>=0;i--){
        if(dp[i][k] < 1e12){
            return dp[i][k];
        }
    }
}

Compilation message (stderr)

aliens.cpp: In function 'long long int take_photos(int, int, int, std::vector<int>, std::vector<int>)':
aliens.cpp:46:1: warning: control reaches end of non-void function [-Wreturn-type]
   46 | }
      | ^

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