# Min flips of continuous characters to make all characters same in a string

- Difficulty Level : Easy
- Last Updated : 13 Jul, 2022

Given a string consisting only of 1’s and 0’s. In one flip we can change any continuous sequence of this string. Find this minimum number of flips so the string consist of same characters only.**Examples:**

Input : 00011110001110 Output : 2 We need to convert 1's sequence so string consist of all 0's. Input : 010101100011 Output : 4

We need to find the min flips in string so all characters are equal. All we have to find numbers of sequence which consisting of 0’s or 1’s only. Then number of flips required will be half of this number as we can change all 0’s or all 1’s.

## C++

`// CPP program to find min flips in binary ` `// string to make all characters equal ` `#include <bits/stdc++.h> ` `using` `namespace` `std; ` ` ` `// To find min number of flips in binary string ` `int` `findFlips(` `char` `str[], ` `int` `n) ` `{ ` ` ` `char` `last = ` `' '` `; ` `int` `res = 0; ` ` ` ` ` `for` `(` `int` `i = 0; i < n; i++) { ` ` ` ` ` `// If last character is not equal ` ` ` `// to str[i] increase res ` ` ` `if` `(last != str[i]) ` ` ` `res++; ` ` ` `last = str[i]; ` ` ` `} ` ` ` ` ` `// To return min flips ` ` ` `return` `res / 2; ` `} ` ` ` `// Driver program to check findFlips() ` `int` `main() ` `{ ` ` ` `char` `str[] = ` `"00011110001110"` `; ` ` ` `int` `n = ` `strlen` `(str); ` ` ` ` ` `cout << findFlips(str, n); ` ` ` ` ` `return` `0; ` `} ` |

## Java

`// Java program to find min flips in binary ` `// string to make all characters equal ` `public` `class` `minFlips { ` ` ` ` ` `// To find min number of flips in binary string ` ` ` `static` `int` `findFlips(String str, ` `int` `n) ` ` ` `{ ` ` ` `char` `last = ` `' '` `; ` `int` `res = ` `0` `; ` ` ` ` ` `for` `(` `int` `i = ` `0` `; i < n; i++) { ` ` ` ` ` `// If last character is not equal ` ` ` `// to str[i] increase res ` ` ` `if` `(last != str.charAt(i)) ` ` ` `res++; ` ` ` `last = str.charAt(i); ` ` ` `} ` ` ` ` ` `// To return min flips ` ` ` `return` `res / ` `2` `; ` ` ` `} ` ` ` ` ` `// Driver program to check findFlips() ` ` ` `public` `static` `void` `main(String[] args) ` ` ` `{ ` ` ` `String str = ` `"00011110001110"` `; ` ` ` `int` `n = str.length(); ` ` ` ` ` `System.out.println(findFlips(str, n)); ` ` ` `} ` `} ` |

## Python 3

`# Python 3 program to find min flips in ` `# binary string to make all characters equal ` ` ` `# To find min number of flips in ` `# binary string ` `def` `findFlips(` `str` `, n): ` ` ` ` ` `last ` `=` `' '` ` ` `res ` `=` `0` ` ` ` ` `for` `i ` `in` `range` `( n) : ` ` ` ` ` `# If last character is not equal ` ` ` `# to str[i] increase res ` ` ` `if` `(last !` `=` `str` `[i]): ` ` ` `res ` `+` `=` `1` ` ` `last ` `=` `str` `[i] ` ` ` ` ` `# To return min flips ` ` ` `return` `res ` `/` `/` `2` ` ` `# Driver Code ` `if` `__name__ ` `=` `=` `"__main__"` `: ` ` ` ` ` `str` `=` `"00011110001110"` ` ` `n ` `=` `len` `(` `str` `) ` ` ` ` ` `print` `(findFlips(` `str` `, n)) ` ` ` `# This code is contributed by ita_c ` |

## C#

`// C# program to find min flips in ` `// binary string to make all ` `// characters equal ` `using` `System; ` ` ` `public` `class` `GFG { ` ` ` ` ` `// To find min number of flips ` ` ` `// in binary string ` ` ` `static` `int` `findFlips(String str, ` `int` `n) ` ` ` `{ ` ` ` `char` `last = ` `' '` `; ` `int` `res = 0; ` ` ` ` ` `for` `(` `int` `i = 0; i < n; i++) { ` ` ` ` ` `// If last character is not ` ` ` `// equal to str[i] increase ` ` ` `// res ` ` ` `if` `(last != str[i]) ` ` ` `res++; ` ` ` `last = str[i]; ` ` ` `} ` ` ` ` ` `// To return min flips ` ` ` `return` `res / 2; ` ` ` `} ` ` ` ` ` `// Driver program to check findFlips() ` ` ` `public` `static` `void` `Main() ` ` ` `{ ` ` ` `String str = ` `"00011110001110"` `; ` ` ` `int` `n = str.Length; ` ` ` ` ` `Console.Write(findFlips(str, n)); ` ` ` `} ` `} ` ` ` `// This code is contributed by nitin mittal ` |

## PHP

`<?php ` `// PHP program to find min flips in binary ` `// string to make all characters equal ` ` ` `// To find min number of ` `// flips in binary string ` `function` `findFlips(` `$str` `, ` `$n` `) ` `{ ` ` ` `$last` `= ` `' '` `; ` ` ` `$res` `= 0; ` ` ` ` ` `for` `(` `$i` `= 0; ` `$i` `< ` `$n` `; ` `$i` `++) ` ` ` `{ ` ` ` ` ` `// If last character is not equal ` ` ` `// to str[i] increase res ` ` ` `if` `(` `$last` `!= ` `$str` `[` `$i` `]) ` ` ` `$res` `++; ` ` ` `$last` `= ` `$str` `[` `$i` `]; ` ` ` `} ` ` ` ` ` `// To return min flips ` ` ` `return` `intval` `(` `$res` `/ 2); ` `} ` ` ` ` ` `// Driver Code ` ` ` `$str` `= ` `"00011110001110"` `; ` ` ` `$n` `= ` `strlen` `(` `$str` `); ` ` ` ` ` `echo` `findFlips(` `$str` `, ` `$n` `); ` ` ` `// This code is contributed by Sam007 ` `?> ` |

## Javascript

`<script> ` ` ` `// JavaScript program to find min flips in binary ` `// string to make all characters equal ` ` ` ` ` ` ` `// To find min number of flips in binary string ` ` ` `function` `findFlips( str , n) { ` ` ` `var` `last = ` `' '` `; ` ` ` `var` `res = 0; ` ` ` ` ` `for` `(i = 0; i < n; i++) { ` ` ` ` ` `// If last character is not equal ` ` ` `// to str[i] increase res ` ` ` `if` `(last != str.charAt(i)) ` ` ` `res++; ` ` ` `last = str.charAt(i); ` ` ` `} ` ` ` ` ` `// To return min flips ` ` ` `return` `parseInt(res / 2); ` ` ` `} ` ` ` ` ` `// Driver program to check findFlips() ` ` ` ` ` `var` `str = ` `"00011110001110"` `; ` ` ` `var` `n = str.length; ` ` ` ` ` `document.write(findFlips(str, n)); ` ` ` ` ` `// This code contributed by aashish1995 ` ` ` `</script> ` |

**Time Complexity: **O(n) **Auxiliary Space: **O(1)

**Output: **

2

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