Submission #939188

#	Time	Username	Problem	Language	Result	Execution time	Memory
939188		Darren0724	Constellation 3 (JOI20_constellation3)	C++17	0 / 100	2 ms	1880 KiB

constellation3

#include <bits/stdc++.h>
using namespace std;
#define int long long 
#define chmin(a,b) a=(a<b?a:b)
#define LCBorz ios_base::sync_with_stdio(false); cin.tie(0);
#define all(x) x.begin(), x.end()
#define endl '\n'
const int N=200005;
const int INF=1e18;

int32_t main() {
    LCBorz;
    int n;cin>>n;
    vector<int> h(n+2),g[n+1];
    vector<vector<int>> v(n+1,vector<int>(n+2)),dp(n+1,vector<int>(n+2,INF));
    for(int i=1;i<=n;i++){
        cin>>h[i];h[i]=n-h[i];
    }
    int m;cin>>m;
    for(int i=1;i<=m;i++){
        int a,b,c;cin>>a>>b>>c;
        b=n-b+1;
        v[a][b]=c;
        g[a].push_back(b);
    }
    dp[0][n+1]=0;
    for(int i=1;i<=n;i++){
        for(int j=h[i]+1;j<=n;j++){
            chmin(dp[i-1][n+1],dp[i-1][j]);
        }
        int total=0;
        for(int j:g[i]){
            total+=v[i][j];
        }
        for(int j=1;j<=n+1;j++){
            chmin(dp[i][j],dp[i-1][j]+total);
        }
        int mn=dp[i-1][n+1];
        for(int j=n;j>=1;j--){
            chmin(dp[i][j],mn+total-v[i][j]);
            chmin(mn,dp[i-1][j]);
        }
        for(int j=h[i]+1;j<=n+1;j++){
            chmin(dp[i][h[i]],mn+total-v[i][j]);
        }
        for(int j=n;j>=1;j--){
            chmin(dp[i][j],dp[i][j+1]);
        }
    }
    cout<<*min_element(all(dp[n]))<<endl;
    
    
    return 0;
}

• Subtask 1: 0 / 14
• Subtask 2: 0 / 21
• Subtask 3: 0 / 65