Submission #894525

#	Time	Username	Problem	Language	Result	Execution time	Memory
894525		vjudge1	Index (COCI21_index)	C++17	60 / 110	404 ms	10688 KiB

index

#include <bits/stdc++.h>
using namespace std;
 
#define speed ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define rall(x) x.rbegin(), x.rend()
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
#define mp make_pair
#define pb push_back
#define F first
#define S second
#define nl '\n'
//#define int long long
 
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef long double ld;
 
const int N = 2e5 + 5;
const int M = 1e3 + 5;
const int inf = 1e9 + 123;
const ll infl = 1e15 + 10;
const int mod = 1e9 + 7;
const int P = 31;
const int block = 300;
 
int n, q, MX, a[N], t[N], ans[N];
 
struct query{
    int l, r, id;
};
 
vector <query> qs;
 

bool cmp(const query& a, const query& b) {
    if(a.l/block < b.l/block)
        return true;
    if(a.l / block > b.l / block)
        return false;
    return a.r < b.r;
}
 
void upd(int v, int tl, int tr, int pos, int x){
    if(tl == tr){
        t[v] += x;
        return;
    }
    int tm = (tl + tr) >> 1;
    if(pos <= tm)
        upd(v + v, tl, tm, pos, x);
    else
        upd(v + v + 1, tm + 1, tr, pos, x);
    t[v] = t[v + v] + t[v + v + 1];
}

int get(int v, int tl, int tr, int l, int r){
    if(tl > r || l > tr)
        return 0;
    if(l <= tl && tr <= r)
        return t[v];
    int tm = (tl + tr) >> 1;
    return get(v + v, tl, tm, l, r) + get(v + v + 1, tm + 1, tr, l, r);
}

void add(int x){
    upd(1, 1, MX, x, 1);
}

void del(int x){
    upd(1, 1, MX, x, -1);
}

void solve() {
    cin >> n >> q;
    for(int i = 1; i <= n; i++)
        cin >> a[i];
    for(int i = 1; i <= q; i++){
        int l, r;
        cin >> l >> r;
        qs.pb({l, r, i});
        MX = max(MX, r);
    }

    sort(all(qs), cmp);
 
    int l = 1, r = 0;
    for(auto Q : qs){
        while (r < Q.r)
            add(a[++r]);
        while (l < Q.l)
            del(a[l++]);
        while (l > Q.l)
            add(a[--l]);
        while(r > Q.r)
            del(a[r--]);
        int l = 1, r = n + 1, mid;
        while(r - l > 1){
            mid = (l + r) >> 1;
            if(get(1, 1, MX, mid, MX) >= mid)
                l = mid; 
            else
                r = mid;
        }
        ans[Q.id] = l;
    }
    for(int i = 1; i <= q; i++)
        cout << ans[i] << nl;
}
 
signed main() { 
    speed;
    int T = 1;
    // cin >> T;
    while (T--)
        solve();
}
 

• Subtask 1: 20 / 20
• Subtask 2: 40 / 40
• Subtask 3: 0 / 50