upgrade to python3;add some validator examples

examples/range_validator.cpp

@@ -0,0 +1,68 @@
+// 数值范围验证程序
+// 验证输出的数值是否在合理范围内
+// 编译: g++ -o range_validator range_validator.cpp
+
+#include <iostream>
+#include <fstream>
+#include <vector>
+#include <algorithm>
+using namespace std;
+
+int main(int argc, char* argv[]) {
+    if (argc != 4) {
+        cout << "WA" << endl;
+        return 0;
+    }
+    
+    ifstream input(argv[1]);     // 输入数据，包含范围信息
+    ifstream expected(argv[2]);  // 期望答案
+    ifstream result(argv[3]);    // 用户输出
+    
+    if (!input.is_open() || !expected.is_open() || !result.is_open()) {
+        cout << "WA" << endl;
+        return 0;
+    }
+    
+    // 读取输入数据中的范围信息
+    int n;
+    input >> n;
+    vector<int> arr(n);
+    for (int i = 0; i < n; i++) {
+        input >> arr[i];
+    }
+    
+    int min_val = *min_element(arr.begin(), arr.end());
+    int max_val = *max_element(arr.begin(), arr.end());
+    
+    // 读取期望答案
+    int exp_result;
+    if (!(expected >> exp_result)) {
+        cout << "WA" << endl;
+        return 0;
+    }
+    
+    // 读取用户答案
+    int user_result;
+    if (!(result >> user_result)) {
+        cout << "WA" << endl;
+        return 0;
+    }
+    
+    // 验证答案是否在合理范围内
+    if (user_result < min_val || user_result > max_val) {
+        cout << "WA" << endl;
+        return 0;
+    }
+    
+    // 验证答案是否正确
+    if (user_result == exp_result) {
+        cout << "AC" << endl;
+    } else {
+        cout << "WA" << endl;
+    }
+    
+    input.close();
+    expected.close();
+    result.close();
+    return 0;
+}