oj.uz

답안 #590049

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
590049 2022-07-05T13:44:20 Z Tien_Noob 3단 점프 (JOI19_jumps) C++17
27 / 100
 97 ms 21552 KB 
//Make CSP great again
//Vengeance
#include <bits/stdc++.h>
#define TASK "TESTCODE"
#define Log2(x) 31 - __builtin_clz(x)
using namespace std;
const int N = 5e5;
int a[N + 1], res[N + 1], n, q;
vector<pair<int, int> > query[N + 1];
struct SegmentTree
{
    int add[4 * N + 1], mx[4 * N + 1], lazy[4 * N + 1];
    void buildtree(int v, int TreeL, int TreeR)
    {
        add[v] = lazy[v] = 0;
        if (TreeL == TreeR)
        {
            mx[v] = a[TreeL];
            return ;
        }
        int mid = (TreeL + TreeR)/2;
        buildtree(v * 2, TreeL, mid);
        buildtree(v * 2 + 1, mid + 1, TreeR);
        mx[v] = max(mx[2 * v], mx[2 * v + 1]);
    }
    void down(int v)
    {
        lazy[2 * v] = max(lazy[2 * v], lazy[v]);
        lazy[2 * v + 1] = max(lazy[2 * v + 1], lazy[v]);
    }
    void upd(int v, int TreeL, int TreeR, int L, int R, int val)
    {
        //cerr << v << '\n';
        if (L > R)
        {
            return ;
        }
        if (TreeL == L && TreeR == R)
        {
            lazy[v] = max(lazy[v], val);
            add[v] = max(add[v], lazy[v] + mx[v]);
            return ;
        }
        int mid = (TreeL + TreeR)/2;
        down(v);
        upd(v * 2, TreeL, mid, L, min(R, mid), val);
        upd(v * 2 + 1, mid + 1, TreeR, max(L, mid + 1), R, val);
        add[v] = max(add[2 * v], add[2 * v + 1]);
    }
    int get(int v, int TreeL, int TreeR, int L, int R)
    {
        if (L > R)
        {
            return 0;
        }
        if (TreeL == L && TreeR == R)
        {
            return max(add[v], lazy[v] + mx[v]);
        }
        down(v);
        int mid = (TreeL + TreeR)/2;
        return max(get(v * 2, TreeL, mid, L, min(R, mid)), get(v * 2 + 1, mid + 1, TreeR, max(L, mid + 1), R));
    }
} tree;
void read()
{
    cin >> n;
    for (int i = 1; i <= n; ++ i)
    {
        cin >> a[i];
    }
    cin >> q;
    for (int i = 1; i <= q; ++ i)
    {
        int l, r;
        cin >> l >> r;
        query[l].emplace_back(r, i);
    }
    tree.buildtree(1, 1, n);
}
void solve()
{
    stack<int> st;
    for (int l = n; l >= 1; -- l)
    {
        while(!st.empty() && a[l] >= a[st.top()])
        {
            tree.upd(1, 1, n, 2 * st.top() - l, n, a[l] + a[st.top()]);
            //cerr << l << ' ' << st.top() << '\n';
            st.pop();
        }
        if (!st.empty())
        {
            //cerr << l << ' ' << st.top() << '\n';
            tree.upd(1, 1, n, 2 * st.top() - l, n, a[l] + a[st.top()]);
        }
        st.push(l);
        for (auto &[r, i] : query[l])
        {
            res[i] = tree.get(1, 1, n, l, r);
        }
    }
    for (int i = 1; i <= q; ++ i)
    {
        cout << res[i] << '\n';
    }
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    if (fopen(TASK".INP", "r"))
    {
        freopen(TASK".INP", "r", stdin);
        //freopen(TASK".OUT", "w", stdout);
    }
    int t = 1;
    bool typetest = false;
    if (typetest)
    {
        cin >> t;
    }
    for (int __ = 1; __ <= t; ++ __)
    {
        //cout << "Case " << __ << ": ";
        read();
        solve();
    }
}

Compilation message

jumps.cpp: In function 'int main()':
jumps.cpp:114:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  114 |         freopen(TASK".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 11988 KB Output is correct
2 Incorrect 7 ms 11988 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 11988 KB Output is correct
2 Incorrect 7 ms 11988 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
27.0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 93 ms 20768 KB Output is correct
2 Correct 59 ms 21552 KB Output is correct
3 Correct 55 ms 20684 KB Output is correct
4 Correct 91 ms 20680 KB Output is correct
5 Correct 97 ms 20788 KB Output is correct
6 Correct 92 ms 20104 KB Output is correct
7 Correct 82 ms 19948 KB Output is correct
8 Correct 81 ms 20004 KB Output is correct
9 Correct 84 ms 20332 KB Output is correct

Subtask #4
0 / 54.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 11988 KB Output is correct
2 Incorrect 7 ms 11988 KB Output isn't correct
3 Halted 0 ms 0 KB -