Submission #659489

#	Time	Username	Problem	Language	Result	Execution time	Memory
659489		pere_gil	Catfish Farm (IOI22_fish)	C++17	61 / 100	866 ms	2097152 KiB

fish

#include "fish.h"
#include "bits/stdc++.h"
using namespace std;
                 
typedef long long ll;
#define all(x) x.begin(),x.end()
     
void fill(vector<ll> &pier, vector<ll> &fish, vector<ll> &v){
	for(int i=0,j=0;i<(int)pier.size();)
		if(j==(int)fish.size()-1 || (pier[i]>=fish[j] && pier[i]<fish[j+1]))
			v[i++]=j;
		else
			j++;
}
     
ll max_weights(int n, int m, vector<int> x, vector<int> y, vector<int> w){
	vector<ll> sum[n],fish[n],temp_pier[n],pier[n];
	vector<pair<ll,ll>> inf_fish[n];
	for(int i=0;i<m;i++) inf_fish[x[i]].push_back({y[i]+1,w[i]});
	for(int i=0;i<n;i++){
		sum[i].push_back(0); fish[i].push_back(0); temp_pier[i].push_back(0);
     
		sort(all(inf_fish[i]));
    		
		for(int j=0;j<(int)inf_fish[i].size();j++){
			fish[i].push_back(inf_fish[i][j].first);
			sum[i].push_back(inf_fish[i][j].second);
			if(i) temp_pier[i-1].push_back(inf_fish[i][j].first);
			if(i!=n-1) temp_pier[i+1].push_back(inf_fish[i][j].first);
		}
	}
	for(int i=0;i<n;i++){
		sort(all(temp_pier[i]));
		pier[i].push_back(temp_pier[i][0]);
		for(int j=1;j<(int)temp_pier[i].size();j++)
			if(temp_pier[i][j]!=temp_pier[i][j-1])
				pier[i].push_back(temp_pier[i][j]);
     
		for(int j=1;j<(int)fish[i].size();j++)
			sum[i][j]+=sum[i][j-1];
	}
	vector<ll> left[n],me[n],right[n];
	for(int i=0;i<n;i++){
		left[i].assign(pier[i].size(),0);
		me[i].assign(pier[i].size(),0);
		right[i].assign(pier[i].size(),0);
     
		if(i) fill(pier[i],fish[i-1],left[i]);
		fill(pier[i],fish[i],me[i]);
		if(i!=n-1) fill(pier[i],fish[i+1],right[i]);
	}
    	
	vector<vector<ll>> dec[n],inc[n];
	for(int i=0;i<n;i++){
		int j=(i) ? pier[i-1].size() : 1;
		int k=pier[i].size();
		dec[i].assign(j,vector<ll>(k,0));
		inc[i].assign(j,vector<ll>(k,0));
	}
     
	for(int i=0;i<(int)pier[0].size();i++)
		for(int j=0;j<(int)pier[1].size();j++){
			ll aux=0;
			if(pier[0][i]>=pier[1][j])
				aux+=sum[1][right[0][i]]-sum[1][me[1][j]];
			else
				aux+=sum[0][left[1][j]]-sum[0][me[0][i]];
			dec[1][i][j]=inc[1][i][j]=aux;
		}
     
	for(int i=2;i<n;i++){
		for(int j=0;j<(int)pier[i-1].size();j++){
     
			//decreasing:
			if(pier[i-1][j]){
				ll prev=0;
				for(int k=0;k<(int)pier[i-2].size();k++){
					if(pier[i-2][k]<pier[i-1][j]) continue;
					prev=max(prev,max(dec[i-1][k][j],inc[i-1][k][j]));
				}
				for(int k=0;k<(int)pier[i].size();k++){
					if(pier[i][k]>pier[i-1][j]) break;
					dec[i][j][k]+=prev;
					dec[i][j][k]+=sum[i][right[i-1][j]]-sum[i][me[i][k]];
				}
			}
			else{
				ll prev=0;
				int pos=0;
				for(int k=0;k<(int)pier[i-2].size();k++){
					ll aux=max(dec[i-1][k][j],inc[i-1][k][j]);
					if(aux>=prev){
						prev=aux;
						pos=k;
					}
				}
				for(int k=0;k<(int)pier[i].size();k++){
					dec[i][j][k]+=prev;
					if(pier[i][k]<pier[i-2][pos]) continue;
					dec[i][j][k]+=sum[i-1][left[i][k]]-sum[i-1][right[i-2][pos]];
				}
			}
     
			//increasing:
			ll prev=0;
			for(int k=0;k<(int)pier[i-2].size();k++){
				if(pier[i-2][k]>pier[i-1][j]) break;
				prev=max(prev,inc[i-1][k][j]);
				if(!pier[i-2][k]) prev=max(prev,dec[i-1][k][j]);
			}
			for(int k=0;k<(int)pier[i].size();k++){
				inc[i][j][k]+=prev;
				if(pier[i-1][j]>=pier[i][k])
					inc[i][j][k]+=sum[i][right[i-1][j]]-sum[i][me[i][k]];
				else
					inc[i][j][k]+=sum[i-1][left[i][k]]-sum[i-1][me[i-1][j]];
			}
		}
	}

	ll res=0;
	for(int i=0;i<(int)pier[n-2].size();i++)
		for(int j=0;j<(int)pier[n-1].size();j++)
			res=max({res,dec[n-1][i][j],inc[n-1][i][j]});
	
	return res;
}

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