[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**. 

```Python
1   import math,string,itertools,fractions,heapq,collections,re,array,bisect,sys,random,time,copy,functools
2   sys.setrecursionlimit(10**7)
3   inf = 10**20
4   eps = 1.0 / 10**15
5   mod = 10**9+7
6   def LI(): return [int(x) for x in sys.stdin.readline().split()]
7   def LI_(): return [int(x)-1 for x in sys.stdin.readline().split()]
8   def LF(): return [float(x) for x in sys.stdin.readline().split()]
9   def LS(): return sys.stdin.readline().split()
10  def I(): return int(sys.stdin.readline())
11  def F(): return float(sys.stdin.readline())
12  def S(): return input()
13  def pf(s): return print(s, flush=True)
14  def main():
15      n,s = LI()
16      a = [LI() for _ in range(n)]
17      x = [_[0] for _ in a]
18      p = [_[1] for _ in a]
19      if x[0] > s:
20          return x[-1] - s
21      if x[-1] < s:
22          return s - x[0]
23      r = 0
24      i = 0
25      j = n - 1
26      d = p[:]
27      e = collections.defaultdict(list)
28      sk = set()
29      while i < j:
30          if x[i] > s:
31              break
32          if x[j] < s:
33              break
34          if d[i] >= d[j]:
35              d[i] += d[j]
36              j -= 1
37              if j >= 0 and d[j] < d[j+1]:
38                  d[j] = d[j+1]
39                  sk.add(i)
40          else:
41              d[j] += d[i]
42              i += 1
43              if i < n and d[i] < d[i-1]:
44                  d[i] = d[i-1]
45                  sk.add(i)
46      t = s
47      if i == j:
48          r += abs(x[i]-s)
49          t = x[i]
50          i -= 1
51          j += 1
52      else:
53          if x[i] > s:
54              r += abs(x[j]-s)
55              t = x[j]
56              i -= 1
57              j += 1
58          else:
59              r += abs(x[i]-s)
60              t = x[i]
61              i -= 1
62              j += 1
63      while i >= 0 or j < n:
64          if i < 0:
65              r += abs(x[-1]-t)
66              break
67          if j >= n:
68              r += abs(x[0]-t)
69              break
70          if i in sk:
71              d[i-1] = d[i]
72              i-=1
73              continue
74          if j in sk:
75              d[j+1] = d[j]
76              j+=1
77              continue
78          if d[i] >= d[j]:
79              r += abs(x[i]-t)
80              t = x[i]
81              i -= 1
82          else:
83              r += abs(x[j]-t)
84              t = x[j]
85              j += 1
86      return r
87  print(main())
```


**Question**: Does line `21` have control dependence over line `71` in function `main`? If so, provide a trace.

**Output**:


Ground truth answer: yes