제출 #1278177

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1278177		wedonttalkanymore	Financial Report (JOI21_financial)	C++20	48 / 100	22 ms	9332 KiB

Main

#include <bits/stdc++.h>
/*
    10 mins AC -> 40 mins subtasks + code
*/
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 = 2e5 + 5, inf = 1e18, mod = 1e9 + 7, block = 320, lim = 19;

int n, D, a[N];
int Min[N];
int Right[N];
int dp[N]; // xet den i va se dat ki luc tai i
pii pos[N];

namespace SPT {
    int st[N][lim + 1];
    int lg[N];
    void preprocess() {
        for (int i = 1; i <= n; i++) st[i][0] = a[i];
        for (int i = 2; i <= n; i++) lg[i] = lg[i / 2] + 1;
        for (int i = 1; i <= lim; i++) {
            for (int j = 1; j + (1 << i) - 1 <= n; j++) {
                st[j][i] = min(st[j][i - 1], st[j + (1 << (i - 1))][i - 1]);
            }
        }
    }
    int get(int l, int r) {
        if (l > r) return 0;
        int k = lg[r - l + 1];
        return min(st[l][k], st[r - (1 << k) + 1][k]);
    }
};

namespace SPT2 {
    int st[N][lim + 1];
    int lg[N];
    void preprocess() {
        for (int i = 1; i <= n; i++) st[i][0] = Min[i];
        for (int i = 2; i <= n; i++) lg[i] = lg[i / 2] + 1;
        for (int i = 1; i <= lim; i++) {
            for (int j = 1; j + (1 << i) - 1 <= n; j++) {
                st[j][i] = max(st[j][i - 1], st[j + (1 << (i - 1))][i - 1]);
            }
        }
    }
    int get(int l, int r) {
        if (l > r) return 0;
        int k = lg[r - l + 1];
        return max(st[l][k], st[r - (1 << k) + 1][k]);
    }
};

struct ST {
    vector <int> st;
    ST(int _n) {
        st.assign(4 * (_n + 1), 0);
    }
    void update(int i, int l, int r, int pos, int val) {
        if (l == r) {
            st[i] = val;
            return;
        }
        int mid = (l + r) / 2;
        if (pos <= mid) update(2 * i, l, mid, pos, val);
        else update(2 * i + 1, mid + 1, r, pos, val);
        st[i] = max(st[2 * i], st[2 * i + 1]);
    }
    int get(int i, int l, int r, int u, int v) {
        if (u > r || v < l) return 0;
        if (u <= l && r <= v) return st[i];
        int mid = (l + r) / 2;
        return max(get(2 * i, l, mid, u, v), get(2 * i + 1, mid + 1, r, u, v));
    }
} st(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 >> D;
    for (int i = 1; i <= n; i++) cin >> a[i];
    SPT::preprocess();
    for (int i = D; i <= n; i++) Min[i] = SPT::get(i - D + 1, i);
    SPT2::preprocess();
    for (int i = 1; i <= n; i++) {
        int l = i + 1, r = n, ans = n + 1;
        while(l <= r) {
            int mid = (l + r) / 2;
            int wl = i + D;
            int wr = mid - 1;
            bool exist = false;
            if (wl <= wr) {
                if (SPT2::get(wl, wr) > a[i]) exist = true;
            }
            if (exist) {
                ans = mid;
                r = mid - 1;
            } else l = mid + 1;
        }
        Right[i] = ans - 1;
    }
    for (int i = 1; i <= n; i++) {
        pos[i] = make_pair(a[i], i);
    }
    sort(pos + 1, pos + n + 1);
    int idx = n;
    int ans = 0;
    while (idx >= 1) {
        int val = pos[idx].first;
        vector<int> grp;
        while (idx >= 1 && pos[idx].first == val) {
            grp.push_back(pos[idx].second);
            idx--;
        }
        for (int v : grp) {
            int ql = v, qr = Right[v];
            int best = st.get(1, 1, n, ql, qr);
            dp[v] = best + 1;
            ans = max(ans, dp[v]);
        }
        for (int v : grp) st.update(1, 1, n, v, dp[v]);
    }
    cout << ans << '\n';
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

Main.cpp: In function 'int main()':
Main.cpp:86:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   86 |         freopen(".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~
Main.cpp:87:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   87 |         freopen(".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 20 / 20
• Subtask 4: 0 / 12
• Subtask 5: 0 / 5
• Subtask 6: 0 / 35