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Submission #494340

# Submission time Handle Problem Language Result Execution time Memory
494340 2021-12-15T08:15:15 Z AlperenT Index (COCI21_index) C++17
110 / 110
 488 ms 9924 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = 2e5 + 5, SQRT = sqrt(N);

int n, q, arr[N], cur, l, r, a, b, cnt[N], cntbig, ans[N];

struct Query{
    int l, r, i;

    bool operator < (const Query &scnd) const{
        if(l / SQRT == scnd.l / SQRT) return r < scnd.r;
        else return l / SQRT < scnd.l / SQRT;
    }
};

Query queries[N];

void fixcur(){
    while(cntbig - cnt[cur] >= cur + 1) cntbig -= cnt[cur], cur++;

    while(cntbig < cur) cur--, cntbig += cnt[cur];
}

int main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);

    cin >> n >> q;

    for(int i = 1; i <= n; i++) cin >> arr[i];

    for(int i = 1; i <= q; i++){
        cin >> queries[i].l >> queries[i].r;
        queries[i].i = i;
    }

    sort(queries + 1, queries + q + 1);

    a = 0, b = -1;

    for(int i = 1; i <= q; i++){
        l = queries[i].l, r = queries[i].r;

        while(b + 1 <= r){
            b++;
            cnt[arr[b]]++;
            if(arr[b] >= cur) cntbig++;
            fixcur();
        }

        while(b > r){
            cnt[arr[b]]--;
            if(arr[b] >= cur) cntbig--;
            b--;
            fixcur();
        }

        while(a - 1 >= l){
            a--;
            cnt[arr[a]]++;
            if(arr[a] >= cur) cntbig++;
            fixcur();
        }

        while(a < l){
            cnt[arr[a]]--;
            if(arr[a] >= cur) cntbig--;
            a++;
            fixcur();
        }

        ans[queries[i].i] = cur;
    }

    for(int i = 1; i <= q; i++) cout << ans[i] << "\n";
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 111 ms 1732 KB Output is correct
12 Correct 108 ms 1764 KB Output is correct
13 Correct 121 ms 1744 KB Output is correct
14 Correct 104 ms 1744 KB Output is correct
15 Correct 108 ms 1744 KB Output is correct
16 Correct 111 ms 1728 KB Output is correct
17 Correct 107 ms 1732 KB Output is correct
18 Correct 105 ms 1752 KB Output is correct
19 Correct 104 ms 1776 KB Output is correct
20 Correct 103 ms 1684 KB Output is correct

Subtask #3
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 111 ms 1732 KB Output is correct
12 Correct 108 ms 1764 KB Output is correct
13 Correct 121 ms 1744 KB Output is correct
14 Correct 104 ms 1744 KB Output is correct
15 Correct 108 ms 1744 KB Output is correct
16 Correct 111 ms 1728 KB Output is correct
17 Correct 107 ms 1732 KB Output is correct
18 Correct 105 ms 1752 KB Output is correct
19 Correct 104 ms 1776 KB Output is correct
20 Correct 103 ms 1684 KB Output is correct
21 Correct 475 ms 6780 KB Output is correct
22 Correct 452 ms 9880 KB Output is correct
23 Correct 462 ms 9924 KB Output is correct
24 Correct 479 ms 9836 KB Output is correct
25 Correct 442 ms 9796 KB Output is correct
26 Correct 454 ms 9864 KB Output is correct
27 Correct 488 ms 9836 KB Output is correct
28 Correct 450 ms 9792 KB Output is correct
29 Correct 443 ms 9840 KB Output is correct
30 Correct 461 ms 9828 KB Output is correct