Submission #629289

#	Time	Username	Problem	Language	Result	Execution time	Memory
629289		handlename	Catfish Farm (IOI22_fish)	C++17	35 / 100	1086 ms	158032 KiB

fish

#include <bits/stdc++.h>
//#include "fish.h"
using namespace std;
#define pb push_back
#define mp make_pair
long long dp[3005][3005][2]; //col,height,increasing/decreasing
vector<pair<int,long long> > arr[100005];
long long qry(int col,int height){ //prefixsum of col to height
	if (arr[col].empty()) return 0;
	pair<int,long long> lol=mp(height,1e18);
	int pos=upper_bound(arr[col].begin(),arr[col].end(),lol)-arr[col].begin();
	pos--;
	return arr[col][pos].second;
}
long long max_weights(int n,int m,vector<int> x,vector<int> y,vector<int> w){
	for (int i=0;i<m;i++){
		x[i]++;
		y[i]++;
		arr[x[i]].pb(mp(y[i],w[i]));
	}
	for (int i=1;i<=n;i++){
		arr[i].pb(mp(0,0));
		sort(arr[i].begin(),arr[i].end());
		for (int j=1;j<(int)arr[i].size();j++){
			arr[i][j].second+=arr[i][j-1].second;
		}
	}
	for (int i=1;i<=n;i++){ //col
		for (int j=0;j<=n;j++){ //col height
			dp[i][j][0]=-1e18;
			dp[i][j][1]=-1e18;
		}
		long long maxi=0;
		for (int j=0;j<=n;j++){
			maxi=max(maxi,dp[i-1][j][0]-qry(i,j)-qry(i-1,j));
			if (i>=2){
				maxi=max(maxi,dp[i-2][j][1]-qry(i-1,j));
			}
			dp[i][j][0]=maxi+qry(i-1,j)+qry(i+1,j);
		}
		maxi=0;
		if (i>=2){
			for (int j=n;j>=0;j--){
				maxi=max(maxi,dp[i-2][j][1]);
				dp[i][j][0]=max(dp[i][j][0],maxi+qry(i+1,j));
			}
		}
		maxi=0;
		for (int j=n;j>=0;j--){
			maxi=max(maxi,dp[i-1][j][1]);
			dp[i][j][1]=maxi+qry(i+1,j)-qry(i,j);
		}
		for (int j=0;j<=n;j++){
			dp[i][j][1]=max(dp[i][j][1],dp[i][j][0]);
		}
	}
	long long ans=0;
	for (int j=0;j<=n;j++){
		ans=max(ans,dp[n][j][1]);
	}
	return ans;
}

• Subtask 1: 0 / 3
• Subtask 2: 0 / 6
• Subtask 3: 0 / 9
• Subtask 4: 14 / 14
• Subtask 5: 21 / 21
• Subtask 6: 0 / 17
• Subtask 7: 0 / 14
• Subtask 8: 0 / 16