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src/HighSchoolProblemGenerator.java

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+ import java.text.DecimalFormat;
+import java.util.Random;
+
+public class HighSchoolProblemGenerator extends AbstractProblemGenerator {
+    public HighSchoolProblemGenerator(Random random, DecimalFormat df) {
+        super(random, df);
+    }
+
+    @Override
+    public MathProblem generate() {
+        int operandCount = random.nextInt(3) + 3; // 3-5 个操作数
+        double[] operandsVal = new double[operandCount];
+        String[] displayOperands = new String[operandCount];
+        String[] selectedOperators = new String[operandCount - 1];
+
+        // 生成基本操作数
+        for (int i = 0; i < operandCount; i++) {
+            int v = random.nextInt(100) + 1;
+            operandsVal[i] = v;
+            displayOperands[i] = String.valueOf(v);
+        }
+        // 运算符选择（更均衡，避免连乘/连除）
+        String previousOperator = null;
+        double pPlus = 0.35, pMinus = 0.25, pTimes = 0.25, pDivide = 0.15;
+        for (int i = 0; i < operandCount - 1; i++) {
+            String operator;
+            if ("*".equals(previousOperator) || "/".equals(previousOperator)) {
+                double randValue = random.nextDouble();
+                double total = pPlus + pMinus;
+                operator = randValue < (pPlus / total) ? "+" : "-";
+            } else {
+                double randValue = random.nextDouble();
+                if (randValue < pPlus) operator = "+";
+                else if (randValue < pPlus + pMinus) operator = "-";
+                else if (randValue < pPlus + pMinus + pTimes) operator = "*";
+                else operator = "/";
+            }
+            selectedOperators[i] = operator;
+            previousOperator = operator;
+        }
+
+        // 三角函数
+        int trigIndex = random.nextInt(operandCount);
+        String[] functions = {"sin", "cos", "tan"};
+        String function = functions[random.nextInt(functions.length)];
+        int[] angles = {0, 30, 45, 60, 90};
+        int angle = angles[random.nextInt(angles.length)];
+        if ("tan".equals(function) && angle == 90) angle = 60; // 避免 tan(90°)
+        double trigVal = calculateTrigFunction(function, angle);
+        operandsVal[trigIndex] = trigVal;
+        displayOperands[trigIndex] = function + angle;
+
+        // 括号选择（显示用 displayOperands，计算用 operandsVal）
+        boolean addedBracket = false;
+        int startPos = findBracketStart(operandsVal, selectedOperators, 0.3);
+        StringBuilder expBuilder = new StringBuilder();
+        for (int i = 0; i < operandCount; i++) {
+            if (startPos != -1 && i == startPos) expBuilder.append("(");
+            expBuilder.append(displayOperands[i]);
+            if (startPos != -1 && i == startPos + 1) expBuilder.append(")");
+            if (i < operandCount - 1) expBuilder.append(" ").append(selectedOperators[i]).append(" ");
+        }
+        String expression = expBuilder.toString();
+
+        // 计算结果（double）
+        double result;
+        if (startPos != -1) {
+            double bracketResult = applyOperatorDouble(operandsVal[startPos], operandsVal[startPos + 1], selectedOperators[startPos]);
+            int newCount = operandCount - 1;
+            double[] newVals = new double[newCount];
+            String[] newOps = new String[newCount - 1];
+            for (int i = 0; i < startPos; i++) newVals[i] = operandsVal[i];
+            newVals[startPos] = bracketResult;
+            for (int i = startPos + 1; i < newCount; i++) newVals[i] = operandsVal[i + 1];
+            for (int i = 0; i < newCount - 1; i++) newOps[i] = (i < startPos) ? selectedOperators[i] : selectedOperators[i + 1];
+            result = newVals[0];
+            for (int i = 0; i < newCount - 1; i++) result = applyOperatorDouble(result, newVals[i + 1], newOps[i]);
+        } else {
+            result = operandsVal[0];
+            for (int i = 0; i < operandCount - 1; i++) result = applyOperatorDouble(result, operandsVal[i + 1], selectedOperators[i]);
+        }
+
+        return new MathProblem(expression, df.format(result), "高中");
+    }
+}