# Minimum swaps for bracket balancing in golang

Go program for Minimum swaps for bracket balancing. Here problem description and other solutions.

``````package main

import "fmt"
/*
Go program for
Minimum swaps for bracket balancing
*/
func swapBalancingCount(text string) {
var n int = len(text)
if n == 0 {
return
}
// Auxiliary variables
var bracketCount int = 0
var index int = 0
var sum int = 0
var data = text
var point = 0
// This is collecting the all open bracket character position.
var openBracket = make([]int,0)
// This loop are collecting position of all open bracket.
// And calculates the number of open and close brackets.
for i := 0 ; i < n ; i++ {
if data[i] == '[' {
openBracket = append(openBracket, i)
bracketCount++
} else {
bracketCount--
}
}
if bracketCount != 0 {
// Means open and close brackets not same
return
}
// Reset bracket counter
bracketCount = 0
for i := 0 ; i < n ; i++ {
if data[i] == '[' {
bracketCount++
index++
} else if data[i] == ']' {
bracketCount--
}
if bracketCount < 0 {
// Calculate number of swap operations
// required to move to block brackets.
// Here open break position will use
sum   += (openBracket[index] - i)
point = openBracket[index]
// Swap element
var t byte = data[i]

data = data[:i] +  string(data[point]) + data[i+1:]
data = data[:point] + string(t) + data[point+1:]

// Reset counter
bracketCount = 1
// Position to next open bracket
index++
}
}
// Balancing bracket

// Display given and calculated results
fmt.Println(" Given text     : ", text)
fmt.Println(" Results text   : ", data)
fmt.Println(" Swaps  : ", sum)
}
func main() {

var text string = "]]][[[[]"
/*
]]][[[[]  <-  text
--
]][][[[]  ➀ Swap position 2-3
--
][]][[[]  ➁ Swap position 1-2
--
[]]][[[]  ➂ Swap position 0-1
--
[]][][[]  ➃ Swap position 3-4
--
[][]][[]  ➄ Swap position 2-3
--
[][][][]  ➅ Swap position 4-5
----------------------------
Number of swap : 6
*/
swapBalancingCount(text)
text = "][[][]"
/*
][[][]  <-  text
--
[][][]  ➀ Swap position 0-1

----------------------------
Number of swap : 1
*/
swapBalancingCount(text)
}``````

Output

`````` Given text     : ]]][[[[]
Results text   : [][][][]
Swaps  : 6
Given text     : ][[][]
Results text   : [][][]
Swaps  : 1``````

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