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34 lines
616 B
34 lines
616 B
#include <bits/stdc++.h>
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using namespace std;
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string str;
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void dfs(int L, int R) {
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if (R > L) {
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int mid = L + R >> 1;
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dfs(L, mid); // 左子树
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dfs(mid + 1, R); // 右子树
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}
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// 我该输出啥？
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int one = 0, zero = 0;
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for (int i = L; i <= R; i++)
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if (str[i] == '0')
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zero++;
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else
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one++;
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if (one && zero)
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cout << 'F';
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else if (one)
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cout << 'I';
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else
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cout << 'B';
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}
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int main() {
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int n;
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cin >> n >> str;
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dfs(0, str.size() - 1);
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return 0;
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}
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