Submission #751036

#	Time	Username	Problem	Language	Result	Execution time	Memory
751036		stevancv	Two Antennas (JOI19_antennas)	C++14	100 / 100	468 ms	45580 KiB

antennas

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define sp ' '
#define en '\n'
#define smin(a, b) a = min(a, b)
#define smax(a, b) a = max(a, b)
using namespace std;
const int N = 2e5 + 2;
const int inf = 2e9;
int mn[4 * N], mx[4 * N], st[4 * N], lzymn[4 * N], lzymx[4 * N], h[N];
void Propagate(int node, int l, int r) {
    if (lzymn[node] == inf) return;
    smax(st[node], lzymx[node] - mn[node]);
    smax(st[node], mx[node] - lzymn[node]);
    if (l < r) {
        smin(lzymn[2 * node], lzymn[node]);
        smin(lzymn[2 * node + 1], lzymn[node]);
        smax(lzymx[2 * node], lzymx[node]);
        smax(lzymx[2 * node + 1], lzymx[node]);
    }
    lzymn[node] = inf; lzymx[node] = -1;
}
void Update(int node, int l, int r, int x, int y) {
    Propagate(node, l, r);
    if (l == r) {
        if (y == 0) {mn[node] = mx[node] = h[l];}
        else {mn[node] = inf; mx[node] = -1;}
        return;
    }
    int mid = l + r >> 1;
    if (x <= mid) Update(2 * node, l, mid, x, y);
    else Update(2 * node + 1, mid + 1, r, x, y);
    mn[node] = min(mn[2 * node], mn[2 * node + 1]);
    mx[node] = max(mx[2 * node], mx[2 * node + 1]);
    smax(st[node], max(st[2 * node], st[2 * node + 1]));
}
void Add(int node, int l, int r, int ql, int qr, int v) {
    Propagate(node, l, r);
    if (r < ql || qr < l) return;
    if (ql <= l && r <= qr) {
        lzymn[node] = lzymx[node] = v;
        Propagate(node, l, r);
        return;
    }
    int mid = l + r >> 1;
    Add(2 * node, l, mid, ql, qr, v);
    Add(2 * node + 1, mid + 1, r, ql, qr, v);
    smax(st[node], max(st[2 * node], st[2 * node + 1]));
}
int Get(int node, int l, int r, int ql, int qr) {
    Propagate(node, l, r);
    if (r < ql || qr < l) return -1;
    if (ql <= l && r <= qr) return st[node];
    int mid = l + r >> 1;
    int aa = Get(2 * node, l, mid, ql, qr);
    int bb = Get(2 * node + 1, mid + 1, r, ql, qr);
    smax(st[node], max(st[2 * node], st[2 * node + 1]));
    return max(aa, bb);
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int n; cin >> n;
    vector<int> a(n), b(n);
    vector<vector<array<int, 2>>> op(n);
    for (int i = 0; i < n; i++) {
        cin >> h[i] >> a[i] >> b[i];
        if (i + a[i] < n) op[i + a[i]].push_back({i, 0});
        if (i + b[i] + 1 < n) op[i + b[i] + 1].push_back({i, 1});
    }
    int q; cin >> q;
    vector<int> l(q), r(q), ans(q);
    vector<vector<int>> qq(n);
    for (int i = 0; i < q; i++) {
        cin >> l[i] >> r[i];
        l[i] -= 1; r[i] -= 1;
        qq[r[i]].push_back(i);
    }
    for (int i = 1; i <= 4 * n; i++) {mn[i] = lzymn[i] = inf; mx[i] = lzymx[i] = st[i] = -1;}
    for (int i = 0; i < n; i++) {
        for (auto u : op[i]) Update(1, 0, n - 1, u[0], u[1]);
        if (i >= a[i]) Add(1, 0, n - 1, max(0, i - b[i]), i - a[i], h[i]);
        for (int j : qq[i]) ans[j] = Get(1, 0, n - 1, l[j], i);
    }
    for (int i = 0; i < q; i++) cout << ans[i] << en;
    return 0;
}

Compilation message (stderr)

antennas.cpp: In function 'void Update(int, int, int, int, int)':
antennas.cpp:31:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   31 |     int mid = l + r >> 1;
      |               ~~^~~
antennas.cpp: In function 'void Add(int, int, int, int, int, int)':
antennas.cpp:46:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   46 |     int mid = l + r >> 1;
      |               ~~^~~
antennas.cpp: In function 'int Get(int, int, int, int, int)':
antennas.cpp:55:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   55 |     int mid = l + r >> 1;
      |               ~~^~~

• Subtask 1: 2 / 2
• Subtask 2: 11 / 11
• Subtask 3: 22 / 22
• Subtask 4: 65 / 65