Submission #932649

#	Time	Username	Problem	Language	Result	Execution time	Memory
932649		Whisper	Index (COCI21_index)	C++17	110 / 110	1704 ms	14772 KiB

index

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

#define int long long
#define FOR(i, a, b) for ( int i = a ; i <= b ; i++ )
#define FORD(i, a, b) for (int i = b; i >= a; i --)
#define REP(i, n) for (int i = 0; i < n; ++i)
#define REPD(i, n) for (int i = n - 1; i >= 0; --i)
#define pii pair<int , int>
#define Lg(x) 31 - __builtin_clz(x)

#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)

constexpr ll LINF = (1ll << 60);
constexpr int INF = (1ll << 30);
constexpr int MAX = 2e5 + 5;
constexpr int Mod = 1e9 + 7;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

void setupIO(){
    #define name "Whisper"
    //Phu Trong from Nguyen Tat Thanh High School for gifted student
    srand(time(NULL));
    cin.tie(nullptr)->sync_with_stdio(false); cout.tie(nullptr);
    //freopen(name".inp", "r", stdin);
    //freopen(name".out", "w", stdout);
    cout << fixed << setprecision(10);
}

template <class X, class Y>
    bool minimize(X &x, const Y &y){
        X eps = 1e-9;
        if (x > y + eps) {x = y; return 1;}
        return 0;
    }

template <class X, class Y>
    bool maximize(X &x, const Y &y){
        X eps = 1e-9;
        if (x + eps < y) {x = y; return 1;}
        return 0;
    }
int nArr, numQuery;
int a[MAX];

#define Block 555

struct Queries{
    int l, r, id;
    Queries(){}
    Queries(int _l, int _r, int _id): l(_l), r(_r), id(_id){}

    bool operator < (const Queries& oth) const{
        if (l / Block == oth.l / Block) return r < oth.r;
        return l / Block < oth.l / Block;
    }
} qs[MAX];
struct FenwickTree{
    int n;
    vector<int> f;
    void init(int _n){
        this -> n = _n;
        f.resize(n + 5);
    }

    void modify(int x, int val){
        for ( ; x > 0; x -= x & (-x)) f[x] += val;
    }
    int query(int x){
        int res = 0;
        for ( ; x <= n; x += x & (-x)) res += f[x];
        return res;
    }
    int query(int l, int r){
        return query(r) - query(l - 1);
    }
} fen;
void add(int x){
    fen.modify(x, 1);
}
void sub(int x){
    fen.modify(x, -1);
}
int res[MAX];
void Whisper(){
    cin >> nArr >> numQuery;
    int Lim = 0;
    for (int i = 1; i <= nArr; ++i) cin >> a[i], maximize(Lim, a[i]);
    for (int i = 1; i <= numQuery; ++i){
        int l, r; cin >> l >> r;
        qs[i] = Queries(l, r, i);
    }
    fen.init(Lim + 5);
    int L = 1, R = 0;
    sort(qs + 1, qs + numQuery + 1);
    for (int i = 1; i <= numQuery; ++i){
        while (L > qs[i].l) add(a[--L]);
        while (L < qs[i].l) sub(a[L++]);
        while (R > qs[i].r) sub(a[R--]);
        while (R < qs[i].r) add(a[++R]);

        int l = 1, r = Lim;
        int ans = 1;
        while (l <= r){
            int mid = (l + r) >> 1;
            if (fen.query(mid) >= mid){
                ans = mid, l = mid + 1;
            }
            else r = mid - 1;
        }
        res[qs[i].id] = ans;
    }
    for (int i = 1; i <= numQuery; ++i) cout << res[i] << '\n';
}


signed main(){
    setupIO();
    int Test = 1;
//    cin >> Test;
    for ( int i = 1 ; i <= Test ; i++ ){
        Whisper();
        if (i < Test) cout << '\n';
    }
}

• Subtask 1: 20 / 20
• Subtask 2: 40 / 40
• Subtask 3: 50 / 50