Count the number of substrings with exactly $$$k$$$ distinct characters. I created a video on this classic 2 Pointer problem
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Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
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Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
4 days
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Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
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Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
4 days
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