Submission #361195

#	Time	Username	Problem	Language	Result	Execution time	Memory
361195		HoneyBadger	Collecting Stamps 3 (JOI20_ho_t3)	C++17	100 / 100	80 ms	65260 KiB

ho_t3

#include <iostream>
#include <iomanip>
#include <cstdio>
#include <vector>
#include <bitset>
#include <string>
#include <cstring>
#include <map>
#include <set>
#include <stack>
#include <queue>
#include <deque>
#include <utility>
#include <algorithm>
#include <random>
#include <cmath>
#include <cassert>
#include <climits>
#include <ctime>
#include <chrono>


/*
#pragma GCC optimize("Ofast")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,sse4.1,sse4.2,popcnt,abm,mmx,avx,avx2,tune=native")
*/


#ifdef LOCAL
    #define dbg(x) cout << #x << " : " << x << endl;
#else
    #define dbg(x)
#endif

#define int long long
#define pb push_back
#define ppb pop_back()
#define mp make_pair
#define fi(a, b) for (int i = a; i < b; i++)
#define fj(a, b) for (int j = a; j < b; j++)
#define fk(a, b) for (int k = a; k < b; k++)
#define fi1(a, b) for (int i = a - 1; i >= b; i--)
#define fj1(a, b) for (int j = a - 1; j >= b; j--)
#define fk1(a, b) for (int k = a - 1; k >= b; k--)
#define fx(x, a) for (auto& x : a)
#define rep(i, a, b) for (int i = a; i < b; ++i)
#define rep1(i, a, b) for (int i = a - 1; i >= b; --i)
#define siz(x) (int)x.size()
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()

using namespace std;

template<typename T1, typename T2>inline void mine(T1 &x, const T2 &y) { if (y < x) x = y; }
template<typename T1, typename T2>inline void maxe(T1 &x, const T2 &y) { if (x < y) x = y; }

ostream& operator << (ostream &out, const vector<int> &b) {
    for (auto k : b) out << k << ' ';
    return out;
}

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef char ch;
typedef string str;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<pii> vpii;
typedef vector<vpii> vvpii;
typedef vector<ch> vch;
typedef vector<vch> vvch;
typedef vector<str> vs;



const int MOD = 1000000007;
const int INF = 1000000050;
const long long BIG = (long long)2e18 + 50;
const double EPS = 1e-9;


mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int xa[201];
int xb[201];
int ta[201];
int tb[201];
int dp[201][201][201][2];

int32_t main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int n, l;
    cin >> n >> l;
    for (int i = 0; i < n; ++i) {
    	int x;
    	cin >> x;
    	xb[i + 1] = x;
    	xa[n - i] = l - x;
    }
    for (int i = 0; i < n; ++i) {
    	int t;
    	cin >> t;
    	tb[i + 1] = t;
    	ta[n - i] = t;
    }
    for (int a = 0; a <= n; ++a) {
    	for (int b = 0; b + a <= n; ++b) {
    		for (int cnt = 0; cnt <= n; ++cnt) {
    			for (int ep = 0; ep < 2; ++ep) {
    				dp[a][b][cnt][ep] = BIG;
    			}
    		}
    	}
    }
    dp[0][0][0][1] = dp[0][0][0][0] = 0;
    for (int s = 0; s < n; ++s) {
    	for (int a = 0; a <= s; ++a) {
    		int b = s - a;
    		for (int cnt = 0; cnt <= s; ++cnt) {
	    		//ep = 0 - in a
    			int t2;
    			// a + 1
    			t2 = dp[a][b][cnt][0] + xa[a + 1] - xa[a];
    			mine(dp[a + 1][b][cnt + (t2 <= ta[a + 1])][0], t2); 
    			// b + 1
    			t2 = dp[a][b][cnt][0] + xa[a] + xb[b + 1];
    			mine(dp[a][b + 1][cnt + (t2 <= tb[b + 1])][1], t2);

	    		// ep = 1 - in b
    			// b + 1
	    		t2 = dp[a][b][cnt][1] + xb[b + 1] - xb[b];
	    		mine(dp[a][b + 1][cnt + (t2 <= tb[b + 1])][1], t2);
    			// a + 1
    			t2 = dp[a][b][cnt][1] + xb[b] + xa[a + 1];
    			mine(dp[a + 1][b][cnt + (t2 <= ta[a + 1])][0], t2);
    		}
    	}
    }
    for (int cnt = n; cnt >= 0; --cnt) {
    	for (int a = 0; a <= n; ++a) {
    		for (int b = max(0ll, cnt - a); a + b <= n; ++b) {
    			for (int ep = 0; ep < 2; ++ep) {
    				if (dp[a][b][cnt][ep] != BIG) {
    					cout << cnt << '\n';
    					exit(0);
    				}
    			}
    		}
    	}
    }
}

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 75 / 75