Submission #748467

#	Time	Username	Problem	Language	Result	Execution time	Memory
748467		QwertyPi	Catfish Farm (IOI22_fish)	C++17	14 / 100	1126 ms	1108504 KiB

fish

#include "fish.h"
#include <bits/stdc++.h>

#define pii pair<int, int>
#define fi first
#define se second
using namespace std;

const int N_MAX = 1e5 + 11;
const int INC = 0;
const int DEC = 1;
const int ZERO = 2;

vector<pair<int, long long>> fish[N_MAX];
int N;

void chmax(long long& x, long long y){
	x = max(x, y);
}

long long g(int x, int y){ // [x, x] times [0, y)
	if(x < 0 || x >= N) return 0;
	auto ptr = lower_bound(fish[x].begin(), fish[x].end(), pair<int, long long>{y, -1LL});
	if(ptr == fish[x].begin()) return 0;
	return (--ptr)->se;
}

long long f(int x, int y0, int y1, int y2){ // (x - 1, y1) -> (x, y2) transition
	return g(x + 1, y2) + g(x - 1, y2) - g(x, min(y1, y2)) - g(x - 1, min(y2, max(y0, y1)));
}

long long dp[3][5001][5001];

long long max_weights(int N, int M, vector<int> X, vector<int> Y, vector<int> W) {
	::N = N;
	for(int i = 0; i < M; i++){
		fish[X[i]].push_back({Y[i], W[i]});
	}
	for(int i = 0; i < N; i++){
		sort(fish[i].begin(), fish[i].end());
		for(int j = 1; j < fish[i].size(); j++){
			fish[i][j].se += fish[i][j - 1].se;
		}
	}
	
	for(int i = 0; i <= N; i++){
		for(int j = 0; j <= N; j++){
			dp[0][i][j] = dp[1][i][j] = dp[2][i][j] = -(1LL << 60); 
		}
	}
	
	dp[ZERO][0][0] = 0;
	for(int x = 0; x < N; x++){
		// ZERO
		for(int y = 0; y <= N; y++){
			chmax(dp[ZERO][x + 1][y], dp[INC][x][y]);
			chmax(dp[ZERO][x + 1][y], dp[DEC][x][y]);
			chmax(dp[ZERO][x + 1][0], dp[ZERO][x][y]);
		}
		
		// INC
		for(int y1 = 0; y1 <= N; y1++){
			for(int y2 = y1; y2 <= N; y2++){
				chmax(dp[INC][x + 1][y2], dp[INC][x][y1] + g(x + 1, y2) - g(x, y1) + g(x - 1, y2) - g(x - 1, y1));
				chmax(dp[INC][x + 1][y2], dp[ZERO][x][y1] + g(x + 1, y2) + g(x - 1, y2) - g(x - 1, min(y2, y1)));
			}
		}
		
		// DEC
		for(int y1 = 0; y1 <= N; y1++){
			for(int y2 = 0; y2 <= y1; y2++){
				chmax(dp[DEC][x + 1][y2], dp[DEC][x][y1] + g(x + 1, y2) - g(x, y2));
				chmax(dp[DEC][x + 1][y2], dp[INC][x][y1] + g(x + 1, y2) - g(x, y2));
			}
		}
	}
	
	/*
	for(int k = 0; k < 3; k++){
		for(int x = 0; x <= N; x++){
			for(int y = 0; y <= N; y++){
				cout << dp[k][x][y] << ' ';
			}
			cout << endl;
		}
		cout << endl;
	}
	*/
	
	long long ans = 0;
	for(int k = 0; k < 3; k++){
		for(int y = 0; y <= N; y++){
			ans = max(ans, dp[k][N][y]);
		}
	}
	return ans;
}

Compilation message (stderr)

fish.cpp: In function 'long long int max_weights(int, int, std::vector<int>, std::vector<int>, std::vector<int>)':
fish.cpp:41:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |   for(int j = 1; j < fish[i].size(); j++){
      |                  ~~^~~~~~~~~~~~~~~~

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