Submission #785156

#	Time	Username	Problem	Language	Result	Execution time	Memory
785156		vjudge1	Catfish Farm (IOI22_fish)	C++17	100 / 100	121 ms	25444 KiB

fish

#include "fish.h"
#include<bits/stdc++.h>
using namespace std;

#define in insert
#define all(x) x.begin(),x.end()
#define pb push_back
#define eb emplace_back
#define ff first
#define ss second

// #define int long long
 
typedef long long ll;
typedef vector<int> vi;
typedef set<int> si;
typedef multiset<int> msi;
typedef pair<int, int> pii;
typedef vector<pii> vpii;

template<typename T>
void mxx(T &a, T b) {
	if(a < b) a = b;
}

long long max_weights(int n, int m, vector<int> X, vector<int> Y, vector<int> W) {
	vector<vector<pair<int, long long>>> pos(n);
	for(int i = 0; i < m; i++) {
		pos[X[i]].eb(Y[i], W[i]);
	}
	vector<vector<pair<long long, long long>>> dp(n);
	for(int i = 0; i < n; i++) {
		sort(all(pos[i]));
		dp[i].resize(pos[i].size(), make_pair(0, 0));
	}
	long long ans = 0;
	for(int i = 1; i < n; i++) {
		int sz = (int)pos[i].size();

		int r = (int)pos[i - 1].size() - 1;
		for(int j = sz - 1; j >= 0; j--) {
			dp[i][j].ss = ans + pos[i][j].ss;
			if(j + 1 < sz) mxx(dp[i][j].ss, dp[i][j + 1].ss + pos[i][j].ss);
			while(r >= 0 && pos[i - 1][r].ff > pos[i][j].ff) {
				mxx(dp[i][j].ss, max(dp[i - 1][r].ff, dp[i - 1][r].ss) + pos[i][j].ss);
				r--;
			}
		}

		for(int j = 0; j < (int)pos[i - 1].size(); j++) {
			mxx(ans, dp[i - 1][j].ss);
		}

		int l = 0;
		for(int j = 0; j < sz; j++) {
			if(j) dp[i][j].ff = dp[i][j - 1].ff;
			while(l < pos[i - 1].size() && pos[i - 1][l].ff < pos[i][j].ff) {
				dp[i][j].ff += pos[i - 1][l].ss;
				mxx(dp[i][j].ff, dp[i - 1][l].ff + pos[i - 1][l].ss);
				l++;
			}
		}

		for(int j = 0; j < sz; j++) {
			mxx(dp[i][j].ff, ans);
		}

		long long sum = 0;
		for(int j = (int)pos[i - 1].size() - 1; j >= 0; j--) {
			sum += pos[i - 1][j].ss;
			mxx(ans, dp[i - 1][j].ff + sum);
		}
	}
	for(int j = 0; j < pos.back().size(); j++) {
		mxx(ans, dp.back()[j].ss);
	}
	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:57:12: 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]
   57 |    while(l < pos[i - 1].size() && pos[i - 1][l].ff < pos[i][j].ff) {
      |          ~~^~~~~~~~~~~~~~~~~~~
fish.cpp:74:19: 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]
   74 |  for(int j = 0; j < pos.back().size(); j++) {
      |                 ~~^~~~~~~~~~~~~~~~~~~

• 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