Submission #629449

#	Time	Username	Problem	Language	Result	Execution time	Memory
629449		handlename	Catfish Farm (IOI22_fish)	C++17	100 / 100	505 ms	65572 KiB

fish

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
 
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;
}
vector<long long> dp1[100005]; //col,height,increasing
vector<long long> dp2[100005]; //col,height,decreasing
vector<long long> whack[100005];
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 (auto j:arr[i]){
			whack[i].pb(j.first);
			whack[i+1].pb(j.first);
			whack[i-1].pb(j.first);
		}
	}
	for (int i=0;i<=n;i++){
		sort(whack[i].begin(),whack[i].end());
		whack[i].erase(unique(whack[i].begin(),whack[i].end()),whack[i].end());
		for (int j=0;j<(int) whack[i].size();j++){
			dp1[i].pb(0);
			dp2[i].pb(0);
		}
	}
	for (int i=1;i<=n;i++){ //col
		long long maxi=0,id=0;
		for (int j=0;j<(int)whack[i].size();j++){
			int k=whack[i][j];
			while (id<(int)whack[i-1].size() && whack[i-1][id]<=k){
				maxi=max(maxi,dp1[i-1][id]-qry(i,whack[i-1][id])-qry(i-1,whack[i-1][id]));
				id++;
			}
			dp1[i][j]=maxi+qry(i-1,k)+qry(i+1,k);
		}
		if (i>=2){
			maxi=0;
			id=0;
			for (int j=0;j<(int)whack[i].size();j++){
				int k=whack[i][j];
				while (id<(int)whack[i-2].size() && whack[i-2][id]<=k){
					maxi=max(maxi,dp2[i-2][id]-qry(i-1,whack[i-2][id]));
					id++;
				}
				dp1[i][j]=max(dp1[i][j],maxi+qry(i-1,k)+qry(i+1,k));
			}
			maxi=0;
			id=whack[i-2].size()-1;
			for (int j=whack[i].size()-1;j>=0;j--){
				int k=whack[i][j];
				while (id>=0 && whack[i-2][id]>=k){
					maxi=max(maxi,dp2[i-2][id]);
					id--;
				}
				dp1[i][j]=max(dp1[i][j],maxi+qry(i+1,k));
			}
		}
		maxi=0;
		id=whack[i-1].size()-1;
		for (int j=whack[i].size()-1;j>=0;j--){
			int k=whack[i][j];
			while (id>=0 && whack[i-1][id]>=k){
				maxi=max(maxi,dp2[i-1][id]);
				id--;
			}
			dp2[i][j]=maxi+qry(i+1,k)-qry(i,k);
		}
		for (int j=0;j<(int)whack[i].size();j++){
			dp2[i][j]=max(dp2[i][j],dp1[i][j]);
		}
	}
	long long ans=0;
	for (int j=0;j<(int)dp2[n].size();j++){
		ans=max(ans,dp2[n][j]);
	}
	return ans;
}

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