Submission #1095113

#	Time	Username	Problem	Language	Result	Execution time	Memory
1095113		KasymK	Hedgehog Daniyar and Algorithms (IZhO19_sortbooks)	C++17	100 / 100	1191 ms	124752 KiB

sortbooks

#include "bits/stdc++.h"
using namespace std;
#define ff first
#define ss second
#define all(v) v.begin(), v.end()
#define ll long long
#define pb push_back
#define pii pair<int, int>
#define pli pair<ll, int>
#define pll pair<ll, ll>
#define tr(i, c) for(auto i = c.begin(); i != c.end(); ++i)
#define wr puts("----------------")
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
const int N = 1e6+6;
const int INF = 2e9;
int v[N], id[N], l[N], r[N], k[N], ans[N];
vector<int> Q[N];

struct node{
    int l, r, val;
} seg[N<<2];

void build(int x, int l, int r){
    seg[x].l = l, seg[x].r = r;
    if(l == r){
        seg[x].val = -INF;
        return;
    }
    int mid = (l+r)>>1;
    build(x<<1, l, mid);
    build(x<<1|1, mid+1, r);
    seg[x].val = max(seg[x<<1].val, seg[x<<1|1].val);
}

void update(int x, int k, int u){
    if(seg[x].l == seg[x].r){
        seg[x].val = u;
        return;
    }
    int mid = (seg[x].l+seg[x].r)>>1;
    if(k <= mid)
        update(x<<1, k, u);
    else
        update(x<<1|1, k, u);
    seg[x].val = max(seg[x<<1].val, seg[x<<1|1].val);
}

int query(int x, int l, int r){
    if(seg[x].l == l and seg[x].r == r)
        return seg[x].val;
    int mid = (seg[x].l+seg[x].r)>>1;
    if(r <= mid)
        return query(x<<1, l, r);
    else if(l > mid)
        return query(x<<1|1, l, r);
    else
        return max(query(x<<1, l, mid), query(x<<1|1, mid+1, r));
}

int main(){
    // freopen("file.txt", "r", stdin);
    int n, q;
    scanf("%d%d", &n, &q);
    for(int i = 1; i <= n; ++i){
        int x;
        scanf("%d", &x);
        v[i] = x;
    }
    stack<int> st;
    for(int i = 1; i <= n; ++i){
        while(!st.empty() and v[st.top()] <= v[i])
            st.pop();
        if(st.empty())
            id[i] = -1;
        else
            id[i] = st.top();
        st.push(i);
    }
    // for(int i = 1; i <= n; ++i)
    //     printf("%d ", id[i]);
    // puts("");
    // wr;
    for(int i = 1; i <= q; ++i){
        scanf("%d%d%d", &l[i], &r[i], &k[i]);
        Q[r[i]].pb(i);
    }
    build(1, 1, n);
    for(int j = 1; j <= n; ++j){
        int i = id[j];
        if(~i)
            update(1, i, v[i]+v[j]);
        for(auto &ww : Q[j])
            ans[ww] = (query(1, l[ww], r[ww]) <= k[ww]);
    }
    for(int i = 1; i <= q; ++i)
        printf("%d\n", ans[i]);
    return 0;
}

Compilation message (stderr)

sortbooks.cpp: In function 'int main()':
sortbooks.cpp:64:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |     scanf("%d%d", &n, &q);
      |     ~~~~~^~~~~~~~~~~~~~~~
sortbooks.cpp:67:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |         scanf("%d", &x);
      |         ~~~~~^~~~~~~~~~
sortbooks.cpp:85:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   85 |         scanf("%d%d%d", &l[i], &r[i], &k[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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