Submission #1264736

#	Time	Username	Problem	Language	Result	Execution time	Memory
1264736		wedonttalkanymore	Collecting Stamps 3 (JOI20_ho_t3)	C++20	0 / 100	0 ms	320 KiB

ho_t3

#include <bits/stdc++.h>
using namespace std;
using ll = long long;

#define int long long
#define pii pair<ll, ll>
#define fi first
#define se second

const ll N = 200 + 5, inf = 1e18, mod = 1e9 + 7, block = 320, lim = 16;

int n, L;
int a[N], a1[N];
int t[N], t1[N];
int pfs[N], pfs1[N];
int dp[N][N];

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    if (fopen(".inp", "r")) {
        freopen(".inp", "r", stdin);
        freopen(".out", "w", stdout);
    }
    cin >> n >> L;
    for (int i = 1; i <= n; i++) cin >> a[i];
    for (int i = 1; i <= n; i++) a1[i] = L - a[i];
    for (int i = 1; i <= n; i++) cin >> t[i];
    for (int i = 1; i <= n; i++) t1[i] = L - t[i];
    for (int i = 1; i <= n; i++) pfs[i] = pfs[i - 1] + a[i] - a[i - 1]; // xuoi kim dong ho
    for (int i = 1; i <= n; i++) pfs1[i] = pfs1[i - 1] + a1[i] - a1[i - 1]; // nguoc
    for (int i = 0; i <= n; i++) {
        for (int j = 0; j <= n; j++) {
            dp[i][j] = -inf;
        }
    }
    dp[0][0] = 0;
    for (int i = 1; i <= n; i++) {
        dp[0][i] = dp[0][i - 1]; // xuoi
        dp[i][0] = dp[i - 1][0]; // nguoc
        if (pfs[i] <= t[i]) {
            dp[0][i]++;
        }
        if (pfs1[i] <= t1[i]) {
            dp[i][0]++;
        }
    }
    int ans = 0;
    for (int i = 0; i < n; i++) { // nguoc
        for (int j = 0; j < n - i + 1; j++) { // xuoi
            if (pfs[j + 1] + pfs1[i] <= t[j + 1]) {
                dp[i][j + 1] = max(dp[i][j + 1], dp[i][j] + 1);
                ans = max(ans, dp[i][j + 1]);
            }
            if (pfs[j] + pfs1[i + 1] <= t1[i + 1]) {
                dp[i + 1][j] = max(dp[i + 1][j], dp[i][j] + 1);
                ans = max(ans, dp[i + 1][j]);
            }
        }
    }
    cout << ans;
    return 0;
}

Compilation message (stderr)

ho_t3.cpp: In function 'int main()':
ho_t3.cpp:22:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |         freopen(".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~
ho_t3.cpp:23:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |         freopen(".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 75