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FZOI/数位递增数.cpp

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+#include <iostream>
+#include <string>
+
+using namespace std;
+
+bool isIncreasingNumber(int n) {
+    string num = to_string(n);
+    for (int i = 0; i < num.size() - 1; i++) {
+        if (num[i] > num[i + 1]) {
+            return false;
+        }
+    }
+    return true;
+}
+
+int main() {
+    int n;
+    cin >> n;
+
+    int count = 0;
+    for (int i = 10; i <= n; i++) {
+        if (isIncreasingNumber(i)) {
+            count++;
+        }
+    }
+
+    cout << count << endl;
+
+    return 0;
+}