제출 #1257605

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1257605		goulthen	Collecting Stamps 3 (JOI20_ho_t3)	C++20	100 / 100	273 ms	531964 KiB

ho_t3

//#pragma GCC optimize("O3")
//#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
template <class T>
using Tree =
    tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
 
#define int long long
#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define fi first
#define se second
#define rep(i, a, b) for (int i = a; i <= b; ++i)
#define per(i, b, a) for (int i = b; i >= a; --i)
#define pb push_back
#define eb emplace_back
#define all(v) (v).begin(), (v).end()
#define lsb(x) (x)&(-x)
#define bug(x) cerr << #x << " " << x << endl;
 
void setIO(string name = "") {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
    if (!name.empty()) {
        freopen((name + ".in").c_str(), "r", stdin);
        freopen((name + ".out").c_str(), "w", stdout);
    }
}
 
ll fexp(ll a, ll b, ll m) {
    if (b == 0) return 1LL;
    ll p = a;
    ll ans = 1;
    while (b > 0) {
        if (b % 2 != 0) ans = (ans * p) % m;
        p = (p * p) % m;
        b >>= 1;
    }
    return ans;
}
 
const int MAXN = 2e2 + 10;
const int INF = 1e18 + 5;
const int MOD = 1e9+7;
int dp[2*MAXN][2*MAXN][MAXN][2], a[2*MAXN], x[MAXN], tt[MAXN], t[2*MAXN];

void solve() {
    int N, L;cin >> N >> L;
    rep(i,1,N) cin >> x[i];
    rep(i,1,N) cin >> tt[i];
    int n = 2*N+1;
    rep(i,1,N) a[i] = x[i] - L, t[i] = tt[i];
    a[N+1] = 0, t[N+1] = -1;
    rep(i,N+2,2*N+1) a[i] = x[i-N-1], t[i] = tt[i-N-1];

    rep(i,1,n) rep(j,1,n) rep(k,0,n) dp[i][j][k][0] = dp[i][j][k][1] = INF;
    dp[N+1][N+1][0][0] = dp[N+1][N+1][0][1] = 0;

    int ans = 0;
    rep(sz,1,N) {
        rep(l,1,n-sz) {
            rep(k,0,N) {
                int r = l + sz;
                int t1 = a[l+1]-a[l], t2 = a[r]-a[l];
                int t3 = a[r] - a[r-1];

                dp[l][r][k][0] = min({dp[l+1][r][k][0] + t1, dp[l+1][r][k][1] + t2, dp[l][r][k][0]});
                if (k>0 && dp[l+1][r][k-1][0] + t1 <= t[l]) dp[l][r][k][0] = min(dp[l][r][k][0], dp[l+1][r][k-1][0] + t1);
                if (k > 0 && dp[l+1][r][k-1][1] + t2 <= t[l]) dp[l][r][k][0] = min(dp[l][r][k][0], dp[l+1][r][k-1][1] + t2);
    

                dp[l][r][k][1] = min({dp[l][r-1][k][1] + t3, dp[l][r-1][k][0] + t2, dp[l][r][k][1]});
                if (k>0 && dp[l][r-1][k-1][1] + t3 <= t[r]) dp[l][r][k][1] = min(dp[l][r][k][1], dp[l][r-1][k-1][1] + t3);
                if (k>0 && dp[l][r-1][k-1][0] + t2 <= t[r]) dp[l][r][k][1] = min(dp[l][r][k][1], dp[l][r-1][k-1][0] + t2);
            }
        }
    }
    
    rep(i,1,N+1) {
        rep(k,1,n) {
            if (min(dp[i][i+N][k][0] , dp[i][i+N][k][1]) != INF) {
                if (ans < k) {
                    ans = k;
                }
            }
        }
    }

    cout << ans << '\n';
}

int32_t main() {
    setIO();
    int tt = 1;
    //cin >> tt;
 
    while (tt-- > 0) solve();
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

ho_t3.cpp: In function 'void setIO(std::string)':
ho_t3.cpp:29:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |         freopen((name + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ho_t3.cpp:30:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |         freopen((name + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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