For problem statement at 0-999/200-299/260-269/262/problemB.txt this is a correct solution, but verifier at 0-999/200-299/260-269/262/verifierB.go ends with All 100 tests passed can you fix the verifier? Looking at this problem, I need to maximize the sum after exactly k sign flips.

**Strategy:**
1. First, flip negative numbers (starting from the most negative ones, which are first in the sorted sequence) - this increases the sum
2. After flipping all negatives (or running out of them), if remaining k is:
   - Even: can pair up flips on any number (no net effect)
   - Odd: must flip the number with smallest absolute value (to minimize loss)

**Key insight:** Since the sequence is sorted non-decreasing, negative numbers come first. After flipping negatives, if k is odd, I need to flip the element with the smallest absolute value.

Let me trace through the examples:
- Example 1: `[-1, -1, 1]`, k=2 → flip both -1s → `[1, 1, 1]` → sum=3 ✓
- Example 2: `[1, 1, 1]`, k=1 → no negatives, k is odd → flip smallest (1) → `[-1, 1, 1]` → sum=1 ✓

```go
package main

import "fmt"

func abs(x int) int {
    if x < 0 {
        return -x
    }
    return x
}

func main() {
    var n, k int
    fmt.Scan(&n, &k)
    
    a := make([]int, n)
    for i := 0; i < n; i++ {
        fmt.Scan(&a[i])
    }
    
    for i := 0; i < n && k > 0 && a[i] < 0; i++ {
        a[i] = -a[i]
        k--
    }
    
    sum := 0
    minAbs := 10001
    for i := 0; i < n; i++ {
        sum += a[i]
        if abs(a[i]) < minAbs {
            minAbs = abs(a[i])
        }
    }
    
    if k%2 == 1 {
        sum -= 2 * minAbs
    }
    
    fmt.Println(sum)
}
```