'commit'

TangDou/CSP-J/AcWingTraining/T8/419_2.cpp

@@ -0,0 +1,33 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+string str;
+
+void dfs(int L, int R) {
+    if (R > L) {
+        int mid = L + R >> 1;
+        dfs(L, mid);     // 左子树
+        dfs(mid + 1, R); // 右子树
+    }
+    // 我该输出啥？
+    int one = 0, zero = 0;
+    for (int i = L; i <= R; i++)
+        if (str[i] == '0')
+            zero++;
+        else
+            one++;
+
+    if (one && zero)
+        cout << 'F';
+    else if (one)
+        cout << 'I';
+    else
+        cout << 'B';
+}
+
+int main() {
+    int n;
+    cin >> n >> str;
+    dfs(0, str.size() - 1);
+    return 0;
+}