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#include <bits/stdc++.h>
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using namespace std;
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const int N = 100100;
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char s[N];
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int main() {
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int n, cnt = 0;
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scanf("%d%s", &n, s);
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for (int i = 0, p = 0; i < n; i++)
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if (p != s[i])
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p = s[i], cnt++;
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printf("%d", min(n, cnt + 2));
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return 0;
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} |
