Submission #243137

#	Time	Username	Problem	Language	Result	Execution time	Memory
243137		xiryss	Watching (JOI13_watching)	C++17	0 / 100	12 ms	384 KiB

watching

//#pragma GCC optimize("Ofast,no-stack-protector")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#pragma GCC optimize("unroll-loops")
/*#pragma GCC optimize("section-anchors")
#pragma GCC optimize("profile-values,profile-reorder-functions,tracer")
#pragma GCC optimize("vpt")
#pragma GCC optimize("rename-registers")
#pragma GCC optimize("move-loop-invariants")
#pragma GCC optimize("unswitch-loops")
#pragma GCC optimize("function-sections")
#pragma GCC optimize("data-sections")
#pragma GCC optimize("branch-target-load-optimize")
#pragma GCC optimize("branch-target-load-optimize2")
#pragma GCC optimize("btr-bb-exclusive")*/
//#pragma comment(linker, "/STACK:367077216")
#define _CRT_SECURE_NO_WARNINGS
#include <chrono>
#include <set>
#include <map>
#include <deque>
#include <string>
#include <cstdint>
#include <cmath>
#include <queue>
#include <cassert>
#include <random>
#include <bitset>
#include <iomanip>
#include <numeric>
#include <time.h>//////////////
#include <ctime>
#include <string>
#include <cstdio>
#include <vector>
#include <cstdlib>
#include <iostream>
#include <algorithm>
#include <unordered_map>
#include <unordered_set>
//++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++
//#define endl '\n'
#define mp make_pair
#define pbc push_back
#define pob pop_back()
#define empb emplace_back
#define queuel queue<long long>
#define sqr(a) ((a) * (a))
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define pin(p) cin >> p.first >> p.second;
#define uniq(a) sort(all(a));(a).resize(unique(all(a)) - a.begin());
#define rev(v) reverse(v.begin(), v.end());
#define sout(s, c) for (auto i : s) cout << i << c;
#define pout(p) cout << p.first << " " << p.second;
#define er(v, l, r) erase(v.begin() + l, v.begin() + r);
#define vin(v) for (ll i = 0; i < v.size(); ++i) cin >> v[i];
#define vout(v, c) for (int i = 0; i < v.size(); ++i) cout << v[i] << c;
#define pushi(v, a) for (int i = 0; i < a.size(); ++i) v.push_back(a[i]);
#define fastio() ios_base::sync_with_stdio(0); cout.tie(0); cin.tie(0); srand(time(NULL))
#define dab(v) for(auto i:v)cout<<i<<' ';
#define sp system("pause")
//++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++
using namespace std;
//++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
//++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++
mt19937 rnd(time(0) + 228 + 'k' + 'e' + 'k' + 'e' + 'r' + 'o' + 'f' + 'e' + 'y');
const ld EPS = 1e-10;
bool checkprime(int x)
{
	for (int i = 2; i * i <= x; ++i) if (x % i == 0) return 0;
	return 1;
}
const ld PI = acos(-1);
const int MOD7 = 1000000007;
const int MOD9 = 1000000009;
int mod = MOD7;
const int inf = 1e9;
int n, p, q;
vector<int> a;
bool check(int w)
{
	vector<vector<int>> dp(n + 1, vector<int>(p + 1, -inf));
	dp[0][p] = q;
	for (int i = 0; i < n; ++i)
	{
		int clo = lower_bound(all(a), a[i] + w) - a.begin();
		int cl = lower_bound(all(a), a[i] + 2 * w) - a.begin();
		for (int j = 0; j<=p; ++j)
		{
			if (j) 
			{
				dp[cl][j - 1] = max(dp[cl][j - 1], dp[i][j]);
			}
			if (dp[i][j])
			{
				dp[cl][j] = max(dp[cl][j], dp[i][j] - 1);
			}
		}

	}
	for (int i = 0; i <= p; ++i)
	{
		if (dp[n][i] >= 0) return 1;
	}
	return 0;
}
signed main()
{
	cin >> n >> p >> q;
	p = min(p, n);
	q = min(q, n);
	a.resize(n);
	vin(a);
	sort(all(a));
	int l = 0, r = 1e9;
	while (r - l > 1)
	{
		int m = (l + r) / 2;
		if (check(m)) r = m;
		else l = m;
	}
	cout << r;
//	sp;
}

Compilation message (stderr)

watching.cpp: In function 'bool check(int)':
watching.cpp:89:7: warning: unused variable 'clo' [-Wunused-variable]
   int clo = lower_bound(all(a), a[i] + w) - a.begin();
       ^~~
watching.cpp: In function 'int main()':
watching.cpp:56:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 #define vin(v) for (ll i = 0; i < v.size(); ++i) cin >> v[i];
                               ~~^~~~~~~~~~
watching.cpp:116:2: note: in expansion of macro 'vin'
  vin(a);
  ^~~

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