Submission #863973

#	Time	Username	Problem	Language	Result	Execution time	Memory
863973		wii	Hedgehog Daniyar and Algorithms (IZhO19_sortbooks)	C++17	100 / 100	680 ms	92412 KiB

sortbooks

#include <bits/stdc++.h>
using namespace std;

typedef double db;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;

#define X first
#define Y second
#define gcd __gcd
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define bit(i, mask) ((mask) >> (i) & 1)
#define reset(x, val) memset(x, val, sizeof(x))
#define foru(i,a,b) for(int i = (a); i <= (b); ++i)
#define ford(i,a,b) for(int i = (a); i >= (b); --i)
#define FastIO ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);

template<typename T> bool maximize(T &res, const T &val) { if (res < val) { res = val; return true; } return false; }
template<typename T> bool minimize(T &res, const T &val) { if (val < res) { res = val; return true; } return false; }

const ll Linf = 0x3f3f3f3f3f3f3f3f;
const int Inf = 0x3f3f3f3f;
const ll Mod = 1e9 + 7;
const ll Mod2 = ll(1e9) + 9;
const int Lim = 1e6 + 5;
const int inv6 = 166666668;

/// ====*====*====*====*====*====*====*====*====*====*====*====*====*====*====*====*====

const int base = 3;
const int N = 1e6 + 2;
const int K = log2(N);
const int dx[] = {+1, -1, 0, 0};
const int dy[] = {0, 0, +1, -1};
const int block_size = sqrt(2e9) + 2;

using tup = tuple<int, int, int>;

int n, q;
int a[N];

int f[N];
vector<tup> qs[N];

void update(int u, int x) {
    for (; u > 0; u -= u & -u)
        maximize(f[u], x);
}

int get(int u) {
    int ans = 0;
    for (; u <= n; u += u & -u)
        maximize(ans, f[u]);
    return ans;
}

int ans[N];
void solve() {
    cin >> n >> q;
    foru(i, 1, n) cin >> a[i];

    int l, r, k;
    foru(i, 1, q) {
        cin >> l >> r >> k;
        qs[r].emplace_back(l, k, i);
    }

    stack<int> st;
    foru(i, 1, n) {
        while (!st.empty() && a[i] >= a[st.top()]) st.pop();
        if (!st.empty()) update(st.top(), a[i] + a[st.top()]);//, cout << i << " " << st.top() << " " << a[i] + a[st.top()] << "\n";

        for (auto [l, k, id]: qs[i]) {
            //cout << "? " << l << " " << i << " " << get(l) << "\n";
            ans[id] = get(l) <= k;
        }

        st.push(i);
    }

    foru(i, 1, q) cout << ans[i] << "\n";
}

signed main() {
    FastIO;

    #define task "test"
    if (fopen(task".inp", "r")) {
		freopen(task".inp", "r", stdin);
		freopen(task".out", "w", stdout);
	}

    #ifdef Sieve
        Linear_sieve();
    #endif

    #ifdef Ckn_calc
        precal_nck();
    #endif

    int ntest = 1;
    // cin >> ntest;
    while (ntest--) {
        //cout << "Case " << q << ": " << "\n"; 
        solve();
        cout << "\n";
    }

    return 0;
}

/**  /\_/\
 *  (= ._.)
 *  / >TL \>AC
**/

Compilation message (stderr)

sortbooks.cpp: In function 'int main()':
sortbooks.cpp:91:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   91 |   freopen(task".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
sortbooks.cpp:92:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   92 |   freopen(task".out", "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