Submission #244218

#	Time	Username	Problem	Language	Result	Execution time	Memory
244218		vaaven	Watching (JOI13_watching)	C++17	0 / 100	10 ms	640 KiB

watching

/*
                                                                                                     
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                                         `-o/:---...---:++.                                         
                                          `-+o+/:---:/+o/.                                          
                                            `.:+oooo+/-.`                                           
                                               ``````                                               
*/
#pragma GCC optimize("fast-math")
#pragma GCC optimize("unroll-loops")
#include <iostream>
#include <iostream>
#include <vector>
#include <algorithm>
#include <iomanip>
#include <tuple>
#include <math.h>
#include <set>
#include <stack>
#include <bitset>
#include <map>
#include <queue>
#include <random>
#include <unordered_set>
#include <unordered_map>
#define DEBUG
#define fi first
#define se second
#define pqueue priority_queue
#define pb(x) push_back(x)
//#define endl '\n'
#define all(x) x.begin(), x.end()
#define int long long
#define mk(a, b) make_pair(a, b)

using namespace std;
      
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef vector<int> vi;
typedef vector<vector<int> > vvi;
typedef vector<ull> vull;
typedef vector<ll> vll;
// typedef tuple<ll, ll, ll> tiii;
typedef pair<int, int> pii;
typedef vector<pair<int, int> > vpii;
typedef pair<ll, ll> pll;
typedef vector<bool> vb;
typedef vector<string> vs;
typedef vector< vector<ll> > vvll;
typedef vector<char> vc;
      
const ll INF = 1e9 + 228;
const ll INFLL = 1e18;
const ll MOD = 1e9 + 7;
//static const int maxn = 1e6 + 228;
const ld eps = 1e-6;
const ld eps2 = 1e-9;
const ll MOD2 = 998244353;
const ll dosz = 5e5;
const ll SZ = (1<<18);
const ld PI = atan2l(0, -1);
     
void fast_io(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
//    freopen("empty.in", "r", stdin);
//    freopen("empty.out", "w", stdout);
}

int n, p, q;
vi nums;

bool check(int mid){
	vvi dp(n+1, vi(q+1, INF));
	dp[0].assign(q+1, 0);
	int cur1 = 1, cur2 = 1;
	for(int i=1; i<=n; i++){
		while((nums[i-1]-nums[cur1-1])>=mid && cur1<i){
			cur1++;
		}
		while((nums[i-1]-nums[cur2-1])>=mid*2 && cur2<i){
			cur2++;
		}
		for(int j=1; j<=q; j++){
			dp[i][j] = min(dp[i][j], dp[cur2-1][j-1]);
		}
		for(int j=0; j<=q; j++){
			dp[i][j] = min(dp[i][j], dp[cur1-1][j]+1);
		}
	}
	return (dp[n][q]<=p);
}

void solve(){	
	cin >> n >> p >> q;
	nums.resize(n);
	set<int> kek;
	for(int &i:nums){
		cin >> i;
		kek.insert(i);
	}
	nums.clear();
	for(int i:kek)
		nums.pb(i);
	n = kek.size();
//	sort(all(nums));
	p = min(n, p);
	q = min(n, q);
	int l = 0, r = 1e9;
	int ans = 0;
	while(l<=r){
		int mid = (l+r)/2;
		if(check(mid)){
			ans = mid;
			r = mid-1;
		} else{
			l = mid+1;
		}
	}
	cout << ans << endl;
}

signed main(){
        fast_io();
	srand(time(NULL));
//	cout << fixed << setprecision(12);
	int q = 1;
//	cin >> q;
	while(q--)
		solve();
     
}

• Subtask 1: 0 / 50
• Subtask 2: 0 / 50