Submission #524106

#	Time	Username	Problem	Language	Result	Execution time	Memory
524106		Kalashnikov	Hedgehog Daniyar and Algorithms (IZhO19_sortbooks)	C++17	0 / 100	1979 ms	38000 KiB

sortbooks

#include <bits/stdc++.h>
using namespace std;
#define all(v) v.begin() , v.end()
const int N = 1e6+55;
int a[N] , lef[N] , mx[4*N] , ans[N];
int n, m;
    
void upd(int pos , int val , int u = 1, int ul = 1, int ur = n) {
    if(ul == ur) {
        mx[u] = val;
        return;
    }
    
    int um = ul+ur >> 1;
    if(pos <= um) upd(pos , val , u<<1 , ul , um);
    else upd(pos , val , u<<1|1 , um+1 , ur);
    mx[u] = max(mx[u<<1] , mx[u<<1|1]);
}

int get(int l , int r , int u = 1 , int ul = 1 , int ur = n) {
    if(l <= ul && ur <= r) return mx[u];
    if(r < ul || ur < l) return 0;
    
    int um = ul+ur >> 1;
    return max(get(l , r , u<<1 , ul , um) , get(l , r , u<<1|1 , um+1 , ur));
}

int main() {
    cin >> n >> m;
    for(int i = 1; i <= n; i ++) {
        cin >> a[i];
    }
    stack<int> st;
    for(int i = 1; i <= n; i ++) {
        lef[i] = i;
        while(st.size() && a[i] >= a[st.top()]) {
            lef[i] = lef[st.top()];
            st.pop();
        }
        st.push(i);
    }
    for(int i = 1; i <= n; i ++) lef[i] --;
    vector<array<int,4>> q;
    for(int i = 1, l, r, k; i <= m; i ++) {
        cin >> l >> r >> k;
        q.push_back({r , l, k , i});
    }
    sort(all(q));
    for(auto [r , l , k , i]: q) {
        if(lef[r] != 0) {
            upd(lef[r] , a[r] + a[lef[r]]);
            lef[r] = 0;
        }
        ans[i] = (get(l , r) <= k);
    }
    for(int i = 1; i <= m; i ++) {
        cout << ans[i] << '\n';
    }
}

Compilation message (stderr)

sortbooks.cpp: In function 'void upd(int, int, int, int, int)':
sortbooks.cpp:14:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   14 |     int um = ul+ur >> 1;
      |              ~~^~~
sortbooks.cpp: In function 'int get(int, int, int, int, int)':
sortbooks.cpp:24:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   24 |     int um = ul+ur >> 1;
      |              ~~^~~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 9
• Subtask 3: 0 / 13
• Subtask 4: 0 / 17
• Subtask 5: 0 / 30
• Subtask 6: 0 / 23