제출 #1257287

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1257287		goulthen	Collecting Stamps 3 (JOI20_ho_t3)	C++20	0 / 100	0 ms	328 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 = 2e3 + 10;
const int INF = 1e18 + 5;
const int MOD = 1e9+7;
pii dp[MAXN][MAXN][2];

void solve() {
    int n, L;cin >> n >> L;
    deque<int> a(n),t(n);
    rep(i,1,n) cin >> a[i-1];
    rep(i,1,n) cin >> t[i-1];

    int ans = 0;
    rep(_,1,n+1) {
        rep(i,1,n) {
            if (abs(a[i-1])<=t[i-1]) dp[i][i][0] = dp[i][i][1] = {1LL,-abs(a[i-1])};
            else dp[i][i][0] = dp[i][i][1] = {0,-abs(a[i-1])};
        }
        rep(sz,1,n-1) {
            rep(l,1,n-sz) {
                int r = l + sz;
                int t1 = a[l]-a[l-1]-dp[l+1][r][0].se, t2 = a[r-1]-a[l-1]-dp[l+1][r][1].se;
                int t3 = a[r-1]-a[r-2]-dp[l][r-1][1].se, t4 = a[r-1]-a[l-1]-dp[l][r-1][0].se;
                dp[l][r][0] = max(make_pair(dp[l+1][r][0].fi + (abs(t1)<=t[l-1]), -t1), make_pair(dp[l+1][r][1].fi + (abs(t2)<=t[l-1]), -t2));
                dp[l][r][0] = max(dp[l][r][0], dp[l][r-1][0]);
                dp[l][r][1] = max(make_pair(dp[l][r-1][0].fi + (abs(t3)<=t[r-1]), -t3), make_pair(dp[l][r-1][1].fi + (abs(t4)<=t[r-1]), -t4));
                dp[l][r][1] = max(dp[l][r][1], dp[l+1][r][1]);
            }
        }

        ans = max(ans,max(dp[1][n][0], dp[1][n][1]).fi);
        //rep(i,1,n) cout << a[i-1] << " \n"[i==n];

        t.push_front(t.back());
        t.pop_back();
        a.push_front(a.back()-L);
        a.pop_back();
    }

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