Submission #967298

#	Time	Username	Problem	Language	Result	Execution time	Memory
967298		ZeroCool	Catfish Farm (IOI22_fish)	C++17	100 / 100	242 ms	47992 KiB

fish

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

using namespace std;

#define pb push_back
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()

using ll = long long;

const ll N = 3e5 + 10;
const ll INF = 1e17;

ll n, m;

vector<pair<ll,ll> > fish[N];



ll get(ll x,ll y){
	return (upper_bound(all(fish[x]), make_pair(y, INF)) - 1)->second;
}

vector<ll> A[N];

ll max_weights(int nn, int mm, vector<int> X, vector<int> Y,vector<int> W) {
	n = nn;
	m = mm;
	
	for(ll i =0 ;i<m;i++){
		fish[X[i] + 1].pb({Y[i], W[i]});
	}
	
	fish[0] = {make_pair(-1, 0)};
	
	for(ll i = 1;i<=n;i++){
		fish[i].pb({-1, 0});
		sort(all(fish[i]));
		
		for(ll j = 1;j< fish[i].size();j++)fish[i][j].second += fish[i][j-1].second;
	}
	
	fish[n + 1] = {make_pair(-1, 0)};
	
	A[0] = {-1};
	
	for(ll i = 1;i<=n;i++){
		for(auto u : fish[i-1]){
			A[i].pb({u.first});
		}
		for(auto u : fish[i+1]){
			A[i].pb({u.first});
		}
		
		sort(all(A[i]));
		A[i].erase(unique(all(A[i])), A[i].end());
	}
	
	A[n+1] = {-1};
	
	vector<ll>dpu = {0}, dpd = {0};
	//assert(0);
	for(ll i = 1;i<=n+1;i++){
		vector<ll> ndpu(A[i].size());
		
		ll pref = 0;
		ll ind = 0;
		//cout<<i<<endl;
		for(ll j = 0;j < A[i].size();j++){
			//cout<<j<<endl;
			ll x = A[i][j];
			
			while(ind < A[i-1].size() && A[i-1][ind] <= x){
				pref = max(pref, dpu[ind] - get(i-1, A[i-1][ind]));
				++ind;
			}
			
			ndpu[j] = max(pref + get(i-1, x), dpd[0]);
		}
		
		vector<ll> ndpd(A[i].size());
		ll suff = 0;
		ind = A[i-1].size();
		
		for(ll j = A[i].size() - 1;j >= 0; j--){
			ll x = A[i][j];
			
			while(ind && A[i-1][ind - 1] >= x){
				--ind;
				suff = max(suff, max(dpu[ind], dpd[ind]) + get(i, A[i-1][ind]));
			}
			
			ndpd[j] = suff - get(i, x);
		}
		
		swap(dpu, ndpu);
		swap(dpd, ndpd);
	}
	
	return max(dpu[0], dpd[0]);
}

Compilation message (stderr)

fish.cpp: In function 'll max_weights(int, int, std::vector<int>, std::vector<int>, std::vector<int>)':
fish.cpp:41:17: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |   for(ll j = 1;j< fish[i].size();j++)fish[i][j].second += fish[i][j-1].second;
      |                ~^~~~~~~~~~~~~~~~
fish.cpp:70:18: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |   for(ll j = 0;j < A[i].size();j++){
      |                ~~^~~~~~~~~~~~~
fish.cpp:74:14: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   74 |    while(ind < A[i-1].size() && A[i-1][ind] <= x){
      |          ~~~~^~~~~~~~~~~~~~~

• 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