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#include<iostream>
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using namespace std;
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int main() {
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int n, ans = 0, c, b, max = 1;
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cin >> n >> b;
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for (int i = 0; i < n - 1; i++) {
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cin >> c;
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if (c == b + 1) max++;
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else max = 1;
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if (ans < max) ans = max;
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b = c;
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}
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cout << ans << endl;
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return 0;
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} |
