oj.uz

답안 #970482

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
970482 2024-04-26T15:40:26 Z DAleksa 3단 점프 (JOI19_jumps) C++17
0 / 100
 116 ms 44372 KB 
#include <bits/stdc++.h>

using namespace std;

struct query {
    int l, r;
    int ans;
};

struct node {
    int mx;
    int ans;
    int lzy;
};

const int N = 5e5 + 10;
int n, q;
int a[N];
query Q[N];
node st[4 * N];
vector<int> qs[N];
vector<int> upd[N];
stack<int> stk;

void build(int index, int l, int r) {
    if(l > r) return;
    if(l == r) {
        st[index].mx = a[l];
        st[index].ans = 0;
        st[index].lzy = 0;
        return;
    }
    int mid = (l + r) / 2;
    build(2 * index, l, mid);
    build(2 * index + 1, mid + 1, r);
    st[index].mx = max(st[2 * index].mx, st[2 * index + 1].mx);
}

void propagate(int index) {
    if(2 * index + 1 < 4 * N && st[index].lzy > 0) {
        st[2 * index].ans = max(st[2 * index].ans, st[2 * index].mx + st[index].lzy);
        st[2 * index].lzy = max(st[2 * index].lzy, st[index].lzy);
        st[2 * index + 1].ans = max(st[2 * index + 1].ans, st[2 * index + 1].mx + st[index].lzy);
        st[2 * index + 1].lzy = max(st[2 * index + 1].lzy, st[index].lzy);
        st[index].lzy = 0;
    }
}

void update(int index, int l, int r, int L, int R, int val) {
    if(l > r || r < L || R < l) return;
    if(L <= l && r <= R) {
        st[index].ans = max(st[index].ans, val + st[index].mx);
        st[index].lzy = max(st[index].lzy, val);
        return;
    }
    propagate(index);
    int mid = (l + r) / 2;
    update(2 * index, l, mid, L, R, val);
    update(2 * index + 1, mid + 1, r, L, R, val);
    st[index].ans = max(st[2 * index].ans, st[2 * index + 1].ans);
}

int get(int index, int l, int r, int L, int R) {
    if(l > r || r < L || R < l) return 0;
    if(L <= l && r <= R) return st[index].ans;
    propagate(index);
    int mid = (l + r) / 2;
    return max(get(2 * index, l, mid, L, R), get(2 * index + 1, mid + 1, r, L, R));
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin >> n;
    for(int i = 1; i <= n; i++) cin >> a[i];
    cin >> q;
    for(int i = 1; i <= q; i++) {
        cin >> Q[i].l >> Q[i].r;
        qs[Q[i].l].push_back(i);
    }
    for(int i = 1; i <= n; i++) {
        while(!stk.empty() && a[stk.top()] <= a[i]) stk.pop();
        if(!stk.empty()) {
            int x = stk.top(), y = i;
            if(y + (y - x) <= n) upd[x].push_back(y);
        }
        stk.push(i);
    }
    while(!stk.empty()) stk.pop();
    for(int i = n; i >= 1; i--) {
        while(!stk.empty() && a[stk.top()] <= a[i]) stk.pop();
        if(!stk.empty()) {
            int x = i, y = stk.top();
            if(y + (y - x) <= n) upd[x].push_back(y);
        }
        stk.push(i);
    }
    build(1, 1, n);
    for(int l = n; l >= 1; l--) {
        for(int y : upd[l]) {
            int x = l;
            int z = y + (y - x);
            update(1, 1, n, z, n, a[x] + a[y]);
        }
        for(int ind : qs[l]) {
            int r = Q[ind].r;
            Q[ind].ans = get(1, 1, n, l, r);
        }
    }
    for(int i = 1; i <= q; i++) cout << Q[i].ans << "\n";
    return 0;
}

Subtask #1
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 29356 KB Output is correct
2 Correct 7 ms 29360 KB Output is correct
3 Correct 6 ms 29276 KB Output is correct
4 Correct 6 ms 29276 KB Output is correct
5 Correct 7 ms 29276 KB Output is correct
6 Incorrect 6 ms 29320 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #2
0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 29356 KB Output is correct
2 Correct 7 ms 29360 KB Output is correct
3 Correct 6 ms 29276 KB Output is correct
4 Correct 6 ms 29276 KB Output is correct
5 Correct 7 ms 29276 KB Output is correct
6 Incorrect 6 ms 29320 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 116 ms 43604 KB Output is correct
2 Correct 64 ms 44304 KB Output is correct
3 Correct 63 ms 44372 KB Output is correct
4 Correct 113 ms 43724 KB Output is correct
5 Incorrect 113 ms 43812 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #4
0 / 54.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 29356 KB Output is correct
2 Correct 7 ms 29360 KB Output is correct
3 Correct 6 ms 29276 KB Output is correct
4 Correct 6 ms 29276 KB Output is correct
5 Correct 7 ms 29276 KB Output is correct
6 Incorrect 6 ms 29320 KB Output isn't correct
7 Halted 0 ms 0 KB -