[INSTRUCTIONS]

You are a program-analysis assistant. Your task is to statically analyze the control dependence of a given code snippet. 

## 1. Control Dependence Definition
  Control dependence captures the influence of control-flow decisions on the execution of statements.

  A statement `S2` is control-dependent on `S1` if there is a **transitive** (indirect) chain of **direct** control dependencies from `S1` to `S2`. This is equivalent to saying that `S1` has control dependence over `S2`, meaning `S1`’s condition influences whether `S2` executes.


  **Direct Control Dependence**:
  A statement `S2` is **directly** control-dependent on a statement `S1` if:
  
  1.	`S1` is a conditional control statement (e.g., an `if`, `while`, `for`, `switch`, etc.).
  
  2.	`S1` directly determines whether `S2` executes. That is, `S1` has multiple successor branches, 

  - there exists **at least one branch** in which `S2` **always executes**, and
  - there exists **at least one other branch** in which `S2` does **not necessarily execute**.

    “Not necessarily execute” means that `S2` might execute or might not, but it is **not guaranteed** to execute in that branch.

  `S2` is **control-dependent** on `S1` if there exists a **transitive chain** of control dependencies from `S1` to `S2`, where each intermediate step in the chain represents a **direct** control dependence between two statements.



## 2. Output Format
When asked, “Does line `S1` have control dependence over line `S2`? If so, provide a trace.” You should respond in JSON format as follows:

- If there is a control dependence:

```json
{
  "ControlDependence": true,
  "Trace": [S1, ..., S2]
}
```

- If there is no control dependence:
```json
{
  "ControlDependence": false
}
```

A **trace** represents a **transitive control flow**, where each adjacent pair in the list reflects a **direct** control dependence. The trace must starts with `S1` and ends with `S2`.


    

## 3. Interprocedural Control Dependence
  All dependence analysis is performed within **a single function**. We do not track dependencies across function boundaries. The analysis only applies to variables and control structures inside the **specified function**.


## 4. Example Code Snippet

### Example 1

```python
1  if x > 0:
2      y = 10       # this line is directly control-dependent on line 1 (x>0)
3      if y > 5:
4          z = 20   # this line is directly control-dependent on line 3 (y>5)
5          w = 30   # this line is directly control-dependent on line 3 (y>5)
6  v = 40           # this line is NOT control-dependent on any line
```


**Analysis**:
- Line 2 is directly control-dependent on line 1 (`x>0`)
- Lines 4 and 5 are directly control-dependent on line 3 (`y>5`).
- Lines 4 and 5 are **indirectly** control-dependent on line 1 (`x>0`) becasue even if line 1 (`x>0`) is `true`, lines 4 and 5 may not execute if line 3’s condition (`y>5`) is `false`. However, since control dependence is transitive, lines 4 and 5 are **indirectly** control-dependent on line 1. 
- Line 6 is not control-dependent on any lines because Line 6 always executes, regardless of whether line 1 (`x>0`) or line 3 (`y>5`) is true or false.



#### Example Question 1.1: 
Does line `1` have control dependence over line `5`? If so, provide a trace.

**Output**: 
```json
{
  "ControlDependence": true,
  "Trace": [1, 3, 5]
}
```

#### Example Question 1.2:
Does line `3` have control dependence over line `6`? If so, provide a trace.

**Output**: 
```json
{
  "ControlDependence": false
}
```


### Example 2

```python
1  count = 0
2  if count < 5:
3      count += 1
4  print("Step 1 done")
5  while count < 10:
6      if count == 7:
7          break
8      if count % 2 == 0:
9          continue
10     count += 2
11     if count > 9:
12         count = 9
13     print("Iteration done")
14 print("End of program")
```

#### Example Question 2.1: 
Does line `5` have control dependence over line `13`? If so, provide a trace.

**Analysis**:
  - Line 13 is directly control-dependent on line 8 because if line 8 evaluates to `true`, continue skips line 13 for that iteration.
  - Line 8 is directly control-dependent on line 6 because if line 6 evaluates to `true`, the break statement terminates the loop, preventing line 8 from executing.
  - Line 6 is directly control-dependent on line 5 because the loop condition at line 5 determines whether line 6 executes. If line 5 evaluates to `false`, execution skips the loop entirely.


Since control dependence is transitive, line 5 indirectly controls line 13 through lines 6 and 8. The trace is `5->6->8->13`.

**Output**:
```json
{
  "ControlDependence": true,
  "Trace": [5, 6, 8, 13]
}
```

#### Example Question 2.2: 
Does line `8` have control dependence over line `10`? If so, provide a trace.


**Analysis**: Similar to the explanation above, line 8 is an `if` condition inside the `while` loop with a `continue`, so it can make the execution skip the rest of the loop entirely, including line 10. Therefore, line 10 directly control-dependent on 8.



**Output**:
```json
{
  "ControlDependence": true,
  "Trace": [8, 10]
}
```

#### Example Question 2.3: 
Does line `5` have control dependence over line `14`? If so, provide a trace.

**Analysis**: Line 5 doesn't affect whether line 14 is reached. Line 14 is outside the while loop (lines 5 -- 13) and will be executed regardless of the condition. 

**Output**:
```json
{
  "ControlDependence": false
}
```


#### Example Question 2.4: 
Does line `2` have control dependence over line `12`? If so, provide a trace.

**Analysis**: Line 2 doesn't affect whether line 12 is reached. The condition in line 2 only controls whether line 3 is executed. Line 12 is in while loop (line 5 -- 13) and will or will not be executed regardless of the condition in line 2. 

**Output**:
```json
{
  "ControlDependence": false
}
```

---

[YOUR TURN]

Below is **your target snippet**. 

```Java
1   import java.util.Scanner;
2   public class Solution {
3       static Long shootDamage;
4       static Long shootCounter;
5       static Long shield;
6       static String code;
7       static Long damage;
8       static Long movements;
9       static int lastIterableElement;
10      public static String hackTheSystem(String[] softwareToHack) {
11          shootDamage = 1L;
12          shootCounter = 0L;
13          shield = Long.parseLong(softwareToHack[0]);
14          code = softwareToHack[1];
15          damage = 0L;
16          movements = 0L;
17          int sizeScript = code.length() - 1;
18          lastIterableElement = sizeScript;
19          for (int i = 0; i < code.length(); i++) {
20              if (code.charAt(i) == 'S') {
21                  damage += shootDamage;
22                  shootCounter++;
23              }
24              if (code.charAt(i) == 'C') {
25                  shootDamage *= 2;
26              }
27          }
28          if (damage <= shield) {
29              return String.valueOf(movements);
30          }
31          if (shootCounter > shield) {
32              return "IMPOSSIBLE";
33          }
34          for (int i = sizeScript; i >= 0; i--) {
35              for (int j = sizeScript - 1; j >= 0; j--) {
36                  if(code.charAt(j) == 'S' && code.charAt(i) == 'S') {
37                      i--;
38                      continue;
39                  }
40                  if(code.charAt(i) == 'C') {
41                      shootDamage /= 2;
42                      i--;
43                      lastIterableElement--;
44                      continue;
45                  }
46                  if (code.charAt(j) == 'C' && code.charAt(i) == 'S') {
47                      movements++;
48                      damage -= (shootDamage / 2);
49                      char[] c = code.toCharArray();
50                      if (damage <= shield) {
51                          return String.valueOf(movements);
52                      }
53                      char temp = c[j];
54                      c[j] = c[i];
55                      c[i] = temp;
56                      code = String.valueOf(c);
57                      if (i == lastIterableElement) {
58                          shootDamage /= 2;
59                          if(i>0) {
60                              i--;
61                          }
62                      } else {
63                          i++;
64                          j += 2;
65                      }
66                  }
67              }
68          }
69          return String.valueOf(movements);
70      }
71      private static final Scanner scan = new Scanner(System.in);
72      public static void main(String[] args) {
73          int numberOfCases = Integer.parseInt(scan.nextLine());
74          String[][] cases = new String[numberOfCases][2];
75          for (int i = 0; i < numberOfCases; i++) {
76              String[] caseNumber = scan.nextLine().split(" ");
77              cases[i][0] = caseNumber[0];
78              cases[i][1] = caseNumber[1];
79          }
80          for (int i = 0; i < numberOfCases; i++) {
81              System.out.println("Case #" + i + ": " + hackTheSystem(cases[i]));
82          }
83      }
84  }
```


**Question**: Does line `20` have control dependence over line `25` in function `hackTheSystem`? If so, provide a trace.

**Output**:


Ground truth answer: no