Try all substrings of s. For each, check if it contains all characters of t.
There are substrings. Checking each against t takes comparisons. Total: .
For , that's operations. Far too slow.
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The trap
Try all substrings of s. For each, check if it contains all characters of t.
There are substrings. Checking each against t takes comparisons. Total: .
For , that's operations. Far too slow.