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| void slidingWindow(string s) { auto window = ...
int left = 0, right = 0; while (right < s.size()) { char c = s[right]; window.add(c); right++;
...
printf("window: [%d, %d)\n", left, right);
while (window needs shrink) { char d = s[left]; window.remove(d); left++;
... } } }
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