Submission #1152907

#	Time	Username	Problem	Language	Result	Execution time	Memory
1152907		AgentPengin	Collecting Stamps 3 (JOI20_ho_t3)	C++20	100 / 100	92 ms	135292 KiB

ho_t3

/**
 *    author:  AgentPengin ( Độc cô cầu bại )
 *    created: 23.12.2022 10:08:02
 *    too lazy to update time
**/
#include<bits/stdc++.h>

#define EL '\n'
#define fi first
#define se second
#define NAME "TASK"
#define ll long long
#define lcm(a,b) (a/gcd(a,b))*b
#define db(val) "["#val" = " << (val) << "] "
#define bend(v) (v).begin(),(v).end()
#define sz(v) (int)(v).size()
#define ex exit(0)
#define int ll

using namespace std;

const ll mod = 1e9 + 7;
const int inf = 0x1FFFFFFF;
const int MAXN = 205;

int n, L, x[MAXN], t[MAXN];

int dp[MAXN][MAXN][MAXN][2];

void ckmin(int &a, int b) {
	a = min(a, b);
}

signed main() {
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    if (ifstream(NAME".inp")) {
        freopen(NAME".inp","r",stdin);
        freopen(NAME".out","w",stdout);
    }
    cin >> n >> L;
	memset(dp, 0x3f, sizeof dp);
	for (int i = 1;i <= n;i++) {
		cin >> x[i];
	}
	for (int i = 1;i <= n;i++) {
		cin >> t[i];
	}
	x[n + 1] = L;
	dp[0][n + 1][0][0] = dp[0][n + 1][0][1] = 0;
	for (int i = 0;i <= n;i++) {
		for (int j = n + 1;j > i;j--) {
			for (int score = 0; score <= (i + (n - j + 1)); score++) {
				if (dp[i][j][score][1] < 1e18) {
					if (j - 1 > i) {
						int time = dp[i][j][score][1] + (x[j] - x[j - 1]);
						ckmin(dp[i][j - 1][score + (time <= t[j - 1])][1], time);
					}
					if (i + 1 < j) {
						int time = dp[i][j][score][1] + (L - x[j] + x[i + 1]);
						ckmin(dp[i + 1][j][score + (time <= t[i + 1])][0], time);
					}
				
				} 
				if (dp[i][j][score][0] < 1e18) {
					if (j - 1 > i) {
						int time = dp[i][j][score][0] + x[i] + L - x[j - 1];
						ckmin(dp[i][j - 1][score + (time <= t[j - 1])][1], time);
					}
					if (i + 1 < j) {
						int time = dp[i][j][score][0] + x[i + 1] - x[i];
						ckmin(dp[i + 1][j][score + (time <= t[i + 1])][0], time);
					}
					
				}
			}
		}
	}
	int res = 0;
	for (int i = 0;i <= n;i++) {
		for (int j = n + 1;j > i;j--) {
			for (int score = 0;score <= n;score++) {
				for (int pos = 0;pos < 2;pos++) {
					if (dp[i][j][score][pos] < 1e18) {
						if (res < score) res = score;
					}
				}
			}
		}
	}
	cout << res;
	
    cerr << "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n";
    return 0;
}
// agent pengin wants to take apio (with anya-san)

Compilation message (stderr)

ho_t3.cpp: In function 'int main()':
ho_t3.cpp:37:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |         freopen(NAME".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
ho_t3.cpp:38:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         freopen(NAME".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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