제출 #681523

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
681523		drdilyor	Hedgehog Daniyar and Algorithms (IZhO19_sortbooks)	C++17	0 / 100	1039 ms	136152 KiB

sortbooks

#include <bits/stdc++.h>
#ifdef ONPC
    #include "t_debug.cpp"
#else
    #define debug(...) 42
#endif
using namespace std;
//namespace pbds = __gnu_pbds;
using ll = long long;
const int inf = 1e9;
const ll infl = 1e18;
const int RANDOM = chrono::high_resolution_clock::now().time_since_epoch().count();
mt19937 rng(RANDOM);
template<typename T, typename U> istream& operator>>(istream& is, pair<T, U>& p) { return is >> p.first >> p.second; }
template<typename Cont> int sz(const Cont& cont) { return int(cont.size()); }
const string fileio = "";
constexpr int tests = 0, nmax = 2e5, nlog = __lg(nmax), mod = 1e9+7;

template<typename F>
struct SegTree {
    int n;
    vector<int> tree;
    const F& merge;
    SegTree(int n, int def, const F& merge) : n(n), tree(4*n, def), merge(merge) {
    }

    int query(int l, int r) {
        l += n;
        r += n;
        int res = tree[0]; // def
        while (l <= r) {
            if (l % 2 == 1) res = merge(res, tree[l++]);
            if (r % 2 == 0) res = merge(tree[r--], res);
            l /= 2;
            r /= 2;
        }
        return res;
    }

    void update(int i, int x) {
        tree[i+= n] = x;
        for (i /= 2; i >= 1; i /= 2)
            tree[i] = merge(tree[i*2], tree[i*2+1]);
    }
};

int solve() {
    
    int n, m;
    cin >> n >> m;
    if (!cin) return 1;
    vector<int> w(n);
    for (auto& i : w) cin >> i;
    vector<int> ix(n);
    iota(ix.begin(), ix.end(), 0);
    sort(ix.begin(), ix.end(), [&](int a, int b) {
        return w[a] > w[b];
    });

    vector<tuple<int,int,int,int>> q(m);
    vector<int> ans(n);
    for (int i = 0; i < m; i++) {
        int l, r, k;
        cin >> l >> r >> k;
        q[i] = {k, l, r, i};
    }
    sort(q.begin(), q.end(), greater{});

    vector<int> left(n, -1);
    vector<int> right(n, n);
    {
        vector<pair<int,int>> st{{-1, -1}};
        for (int i = 0; i < n; i++) {
            if (w[i] < st.back().first) {
                left[i] = st.back().second;
            }
            while (w[i] <= st.back().first)
                st.pop_back();
            st.emplace_back(w[i], i);
        }
    }
    {
        vector<pair<int,int>> st{{inf+1, n}};
        for (int i = n-1; i >= 0;i --) {
            if (w[i] > st.back().first) {
                right[i] = st.back().second;
            }
            while (w[i] >= st.back().first)
                st.pop_back();
            st.emplace_back(w[i], i);
        }
    }


    SegTree lbound(n, -1, [](int a, int b) { return max(a, b); });
    SegTree rbound(n, n, [](int a, int b) { return min(a, b); });

    int j = 0;
    for (auto [k, l, r, qi] : q) {
        while (j < n && k < w[ix[j]]) {
            lbound.update(ix[j], left[ix[j]]);
            rbound.update(ix[j], right[ix[j]]);
            j++;
        }
        int lb = lbound.query(l, r);
        int rb = rbound.query(l, r);
        assert(lb <= rb);
        cout << (lb <= l && r <= rb) << '\n';
    }


    return 0;
}

signed main() {
    int t = 1;
    #ifdef ONPC
    t = 10000;
    #else
    if (fileio.size()) {freopen((fileio+".in").c_str(),"r",stdin);freopen((fileio+".out").c_str(),"w",stdout);}
    #endif
    cin.tie(0)->sync_with_stdio(0);
    if (tests) cin >> t;
    while (t-- && cin) {
        if (solve()) break;
        #ifdef ONPC
            cout << "____________________" << endl;
        #endif
    }
    return 0;
}

/*
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▒███ ▒███  ▒███ ▒▒▒ ▒███ ▒███  ▒███  ▒███  ▒███ ▒███ ▒███ ▒███ ▒███ ▒▒▒ 
▒███ ▒███  ▒███     ▒███ ▒███  ▒███  ▒███  ▒███ ▒███ ▒███ ▒███ ▒███     
▒▒████████ █████    ▒▒████████ █████ █████ ▒▒███████ ▒▒██████  █████    
 ▒▒▒▒▒▒▒▒ ▒▒▒▒▒      ▒▒▒▒▒▒▒▒ ▒▒▒▒▒ ▒▒▒▒▒   ▒▒▒▒▒███  ▒▒▒▒▒▒  ▒▒▒▒▒     
                                            ███ ▒███                    
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*/

컴파일 시 표준 에러 (stderr) 메시지

sortbooks.cpp: In function 'int main()':
sortbooks.cpp:120:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  120 |     if (fileio.size()) {freopen((fileio+".in").c_str(),"r",stdin);freopen((fileio+".out").c_str(),"w",stdout);}
      |                         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sortbooks.cpp:120:74: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  120 |     if (fileio.size()) {freopen((fileio+".in").c_str(),"r",stdin);freopen((fileio+".out").c_str(),"w",stdout);}
      |                                                                   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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