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답안 #932713

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
932713 2024-02-24T04:27:51 Z ShadowShark Sjeckanje (COCI21_sjeckanje) C++17
110 / 110
 333 ms 30336 KB 
#include <bits/stdc++.h>
using namespace std;

   ///***Author: ShadowShark***\\\
Con thuyen nho vuot muon trung nui non

const int maxN = 2e5 + 5;
long long a[maxN];
int n, q;

namespace subtask2 {

long long d[maxN], dp[maxN][2];

void solve() {
    for (int i = 1; i <= q; i++) {
        int l, r, x;
        cin >> l >> r >> x;

        for (int i = l; i <= r; i++)
            a[i] += x;

        for (int i = 1; i < n; i++)
            d[i] = a[i] - a[i + 1];

        d[n] = 0; dp[0][0] = 0; dp[0][1] = 0;

        for (int i = 1; i < n ; i++){
            dp[i][0]= max(dp[i - 1][0], dp[i - 1][1]);
            dp[i][1]= max(dp[i - 1][0], dp[i - 1][1] * (d[i] * d[i - 1] >= 0)) + abs(d[i]);
        }

        cout << max(dp[n - 1][0], dp[n - 1][1]) << '\n';
    }
}
}

namespace subtask3 {
    const long long inf = 1e18;
    long long d[maxN];

    struct node {
        long long f[2][2]; /// dp [left chosen?][right chosen?]
    } st[4 * maxN];

    node merge_node(node a, node b, int mid) {
        node temp;

        /// Case d[mid] and d[mid + 1] are diff comp to 0
        temp.f[1][1] = max(a.f[1][1] + b.f[0][1], a.f[1][0] + b.f[1][1]);
        temp.f[1][0] = max(a.f[1][1] + b.f[0][0], a.f[1][0] + b.f[1][0]);
        temp.f[0][1] = max(a.f[0][0] + b.f[1][1], a.f[0][1] + b.f[0][1]);
        temp.f[0][0] = max(a.f[0][1] + b.f[0][0], a.f[0][0] + b.f[1][0]);

        /// Case not
        if ((d[mid] >= 0 && d[mid + 1] >= 0) || (d[mid] < 0 && d[mid + 1] < 0)) {
            temp.f[1][1] = max(a.f[1][1], a.f[1][0]) + max(b.f[1][1], b.f[0][1]);
            temp.f[1][0] = max(a.f[1][1], a.f[1][0]) + max(b.f[1][0], b.f[0][0]);
            temp.f[0][1] = max(a.f[0][1], a.f[0][0]) + max(b.f[0][1], b.f[1][1]);
            temp.f[0][0] = max(a.f[0][1], a.f[0][0]) + max(b.f[0][0], b.f[1][0]);
        }

        return temp;
    }

    void build(int id, int l, int r) {
        if (l == r) {
            st[id].f[1][1] = abs(d[l]);
            return ;
        }

        int mid = (l + r) / 2;

        build(2 * id, l, mid);
        build(2 * id + 1, mid + 1, r);

        st[id] = merge_node(st[2 * id], st[2 * id + 1], mid);
        return ;
    }

    void update(int id, int l, int r, int pos) {
        if (pos < l || r < pos) return ;

        if (l == r) {
            st[id].f[1][1] = abs(d[pos]);
            st[id].f[0][0] = st[id].f[0][1] = st[id].f[1][0] = 0;
            return ;
        }

        int mid = (l + r) / 2;
        update(2 * id, l, mid, pos);
        update(2 * id + 1, mid + 1, r, pos);

        st[id] = merge_node(st[2 * id], st[2 * id + 1], mid);
        return ;
    }

    void solve() {
        for (int i = 1; i < n; i++)
            d[i] = a[i] - a[i + 1];

        build(1, 1, n - 1);

        for (int i = 1; i <= q; i++) {
            int l, r, x;
            cin >> l >> r >> x;

            if (l > 1) {
                d[l - 1] -= x;
                update(1, 1, n - 1, l - 1);
            }

            d[r] += x;
            update(1, 1, n - 1, r);

            cout << max({st[1].f[0][0], st[1].f[0][1], st[1].f[1][0], st[1].f[1][1]}) << '\n';
        }
    }

}
int main() {
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    //freopen("sjeckanje.inp", "r", stdin);
   // freopen("sjeckanje.out", "w", stdout);

    cin >> n >> q;

    for (int i = 1; i <= n; i++)
        cin >> a[i];

    /*if (n <= 3000) subtask2::solve();
        else subtask3::solve();*/
    subtask3::solve();

    return 0;
}

Compilation message

Main.cpp:4:4: warning: multi-line comment [-Wcomment]
    4 |    ///***Author: ShadowShark***\\\
      |    ^

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2404 KB Output is correct
5 Correct 2 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct

Subtask #2
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2404 KB Output is correct
5 Correct 2 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 4 ms 4700 KB Output is correct
8 Correct 4 ms 4784 KB Output is correct
9 Correct 4 ms 4768 KB Output is correct
10 Correct 4 ms 4696 KB Output is correct
11 Correct 4 ms 4700 KB Output is correct
12 Correct 4 ms 4700 KB Output is correct

Subtask #3
55.0 / 55.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2404 KB Output is correct
5 Correct 2 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 4 ms 4700 KB Output is correct
8 Correct 4 ms 4784 KB Output is correct
9 Correct 4 ms 4768 KB Output is correct
10 Correct 4 ms 4696 KB Output is correct
11 Correct 4 ms 4700 KB Output is correct
12 Correct 4 ms 4700 KB Output is correct
13 Correct 293 ms 23400 KB Output is correct
14 Correct 329 ms 29776 KB Output is correct
15 Correct 319 ms 29672 KB Output is correct
16 Correct 290 ms 29524 KB Output is correct
17 Correct 333 ms 29560 KB Output is correct
18 Correct 288 ms 30336 KB Output is correct