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    string a, b;
    cin >> a >> b;

    int n = a.size(), m = b.size();
    int count = 0;

    for (int i = 0; i + m <= n; i++) {
        string s = a.substr(i, m);
        if (s == b)
            count++;
    }

1) O(n)
2) O(n+m)
3) O(n^2)
4) O(nm)

time 500 ms
memory 256 Mb
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