Unexpected TLE in O(NlogN) Algorithm with N = 2e5

Revision en1, by Riyad_Hossain, 2024-06-28 12:57:35

Hello coders,

I've recently encountered a perplexing issue while working on a problem where the input size (N) is up to 200,000. Despite my algorithm's O( n log n ) complexity, it consistently hits a Time Limit Exceeded (TLE) error on the 8th test case. I've optimized my code to the best of my ability and ensured it's running in O(NlogN) time complexity, but the problem persists.

Problem: 1955D - Inaccurate Subsequence Search Submission: 267829049

Main Code: Iterate over n and log n for

    int cnt = 0;
    map<int, int> mpp;
    for (int i = 0; i < m; i++)
    {
        mpp[a[i]]++;
        if (ms.count(a[i]) >= mpp[a[i]])
            cnt++;
    }
 
    int ans = cnt >= k;
    for (int i = 0; i < n - m; i++)
    {
        mpp[a[i]]--;
        if (ms.count(a[i]) > mpp[a[i]])
            cnt--;
 
        mpp[a[i + m]]++;
        if (ms.count(a[i + m]) >= mpp[a[i + m]])
            cnt++;
        ans += cnt >= k;
    }
 
    print(ans);
Tags tle, help

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  Rev. Lang. By When Δ Comment
en3 English Riyad_Hossain 2024-06-29 06:17:00 1 Tiny change: 'lo coders,\n\nI've r' -> 'lo coders, \n\nI've r'
en2 English Riyad_Hossain 2024-06-28 13:05:06 368
en1 English Riyad_Hossain 2024-06-28 12:57:35 1051 Initial revision (published)