Submission #1282496

#	Time	Username	Problem	Language	Result	Execution time	Memory
1282496		swishy123	Hedgehog Daniyar and Algorithms (IZhO19_sortbooks)	C++20	100 / 100	1699 ms	38116 KiB

sortbooks

#include <bits/stdc++.h>
#define ll long long
#define ld long double

using namespace std;

const int def = 4e6+1;
const int maxk = 18;
const ll inf = 1e18;

int st[def];
void update(int l, int r, int crr, int i, int v){
    if (r < i || l > i)
        return;
    if (l == r){
        st[crr] = max(v, st[crr]);
        return;
    }
    int mid = (l + r) / 2;
    update(l, mid, crr * 2 + 1, i, v);
    update(mid + 1, r, crr * 2 + 2, i, v);

    st[crr] = max(st[crr * 2 + 1], st[crr * 2 + 2]);
}

int get(int l, int r, int ql, int qr, int crr){
    if (l > qr || r < ql)
        return 0;
    if (l >= ql && r <= qr)
        return st[crr];
    int mid = (l + r) / 2;
    return max(get(l, mid, ql, qr, crr * 2 + 1), get(mid + 1, r, ql, qr, crr * 2 + 2));
}

void solve(){
    int n, q;
    cin >> n >> q;

    vector<int> a(n);
    for (int i = 0; i < n; i++)
        cin >> a[i];

    stack<pair<int, int>> st;
    vector<int> pos(n, -1);

    for (int i = 0; i < n; i++){
        while (st.size() && st.top().first <= a[i])
            st.pop();
        if (st.size())
            pos[i] = st.top().second;
        st.push({a[i], i});
    }

    vector<tuple<int, int, int, int>> qr;
    for (int i = 0; i < q; i++){
        int l, r, k;
        cin >> l >> r >> k;

        l--; r--;
        qr.push_back({r, l, k, i});
    }
    sort(qr.begin(), qr.end());

    int j = 0;
    vector<int> res(q, -1);

    for (int i = 0; i < q; i++){
        auto [r, l, k, indx] = qr[i];
        while (j <= r){
            if (pos[j] != -1)
                update(0, n - 1, 0, pos[j], a[pos[j]] + a[j]);
            j++;
        }
        int val = get(0, n - 1, l, r, 0);
        res[indx] = val <= k;
    }
    for (int i = 0; i < q; i++)
        cout << res[i] << endl;
}

/*

*/

main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    if (ifstream("input.txt").good()){
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout); 
    }

    int t = 1;
    while (t--){
        solve();
        cout << "\n";
    }
}

Compilation message (stderr)

sortbooks.cpp:85:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   85 | main(){
      | ^~~~
sortbooks.cpp: In function 'int main()':
sortbooks.cpp:90:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   90 |         freopen("input.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
sortbooks.cpp:91:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   91 |         freopen("output.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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