Submission #746257

#	Time	Username	Problem	Language	Result	Execution time	Memory
746257		nguyentunglam	Triple Jump (JOI19_jumps)	C++17	100 / 100	1045 ms	59980 KiB

jumps

#include<bits/stdc++.h>
#define fi first
#define se second
#define endl "\n"
#define ii pair<int, int>
using namespace std;
const int N = 5e5 + 10;
int lazy[N << 2], T[N << 2], mx[N << 2];
int a[N], ans[N];
vector<pair<int, int> > query[N];

void build(int s, int l, int r) {
    lazy[s] = -2e9;
    if (l == r) {
        mx[s] = a[l];
        return;
    }
    int mid = l + r >> 1;
    build(s << 1, l, mid);
    build(s << 1 | 1, mid + 1, r);
    mx[s] = max(mx[s << 1], mx[s << 1 | 1]);
}

void push(int s, int l, int r) {
    T[s] = max(T[s], lazy[s] + mx[s]);
    if (l != r) {
        lazy[s << 1] = max(lazy[s << 1], lazy[s]);
        lazy[s << 1 | 1] = max(lazy[s << 1 | 1], lazy[s]);
    }
}

void up(int s, int l, int r, int from, int to, int val) {
    push(s, l, r);
    if (l > to || r < from) return;
    if (from <= l && r <= to) {
        lazy[s] = max(lazy[s], val);
        push(s, l, r);
        return;
    }
    int mid = l + r >> 1;
    up(s << 1, l, mid, from, to, val);
    up(s << 1 | 1, mid + 1, r, from, to, val);
    T[s] = max(T[s << 1], T[s << 1  | 1]);
}

int get(int s, int l, int r, int from, int to) {
    push(s, l, r);
    if (l > to || r < from) return 0;
    if (from <= l && r <= to) return T[s];
    int mid = l + r >> 1;
    return max(get(s << 1, l, mid, from, to), get(s << 1 | 1, mid + 1, r, from, to));
}

int main() {
    #define task ""
    cin.tie(0) -> sync_with_stdio(0);
    if (fopen ("task.inp", "r")) {
        freopen ("task.inp", "r", stdin);
        freopen ("task.out", "w", stdout);
    }
    if (fopen (task".inp", "r")) {
        freopen (task".inp", "r", stdin);
        freopen (task".out", "w", stdout);
    }
    int n; cin >> n;
    for(int i = 1; i <= n; i++) cin >> a[i];
    build(1, 1, n);

    int q; cin >> q;
    for(int i = 1; i <= q; i++) {
        int l, r; cin >> l >> r;
        query[l].emplace_back(r, i);
    }
    stack<int> st;
    for(int i = n; i >= 1; i--) {
        while (!st.empty() && a[st.top()] <= a[i]) {
            up(1, 1, n, st.top() * 2 - i, n, a[st.top()] + a[i]);
            st.pop();
        }
        if (!st.empty()) up(1, 1, n, st.top() * 2 - i, n, a[st.top()] + a[i]);
        for(auto &[r, idx] : query[i]) {
            ans[idx] = get(1, 1, n, i, r);
        }
        st.push(i);
    }
    for(int i = 1; i <= q; i++) cout << ans[i] << endl;
}

Compilation message (stderr)

jumps.cpp: In function 'void build(int, int, int)':
jumps.cpp:18:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   18 |     int mid = l + r >> 1;
      |               ~~^~~
jumps.cpp: In function 'void up(int, int, int, int, int, int)':
jumps.cpp:40:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   40 |     int mid = l + r >> 1;
      |               ~~^~~
jumps.cpp: In function 'int get(int, int, int, int, int)':
jumps.cpp:50:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   50 |     int mid = l + r >> 1;
      |               ~~^~~
jumps.cpp: In function 'int main()':
jumps.cpp:58:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   58 |         freopen ("task.inp", "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
jumps.cpp:59:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |         freopen ("task.out", "w", stdout);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
jumps.cpp:62:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   62 |         freopen (task".inp", "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
jumps.cpp:63:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |         freopen (task".out", "w", stdout);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 14 / 14
• Subtask 3: 27 / 27
• Subtask 4: 54 / 54