# Calculate score for the given binary string

Given a binary string str. For n-contiguous 1s the score is updated as score = score + n2 and for n-contiguous 0s, the score is updated as score = score – n2. The task is to find the score of the complete binary string.

Examples:

Input: str = 11011
Output: 7
score(“11”) – score(“0”) + score(“11”) = 22 – 12 + 22 = 7

Input: str = 1100011
Output: -1

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

Approach: For solving the problem iterate over the given string and calculate the number of contiguous 1s and 0s. For each contiguous chunk of n 1s add n2 to the current score and similarly for each contiguous chunk of n 0s subtract n2 from the current score.

Below is the implementation of the above approach:

## C++

 `// C++ implementation of the approach ` `#include ` `using` `namespace` `std; ` ` `  `// Function to return the score for ` `// the given binary string ` `int` `calcScore(string str) ` `{ ` `    ``int` `score = 0; ` `    ``int` `len = str.length(); ` ` `  `    ``// Traverse through string character ` `    ``for` `(``int` `i = 0; i < len;) { ` ` `  `        ``// Initialize current chunk's size ` `        ``int` `chunkSize = 1; ` ` `  `        ``// Get current character ` `        ``char` `currentChar = str[i++]; ` ` `  `        ``// Calculate total chunk size ` `        ``// of same characters ` `        ``while` `(i < len && str[i] == currentChar) { ` `            ``chunkSize++; ` `            ``i++; ` `        ``} ` ` `  `        ``// Add/subtract pow(chunkSize, 2) ` `        ``// depending upon character ` `        ``if` `(currentChar == ``'1'``) ` `            ``score += ``pow``(chunkSize, 2); ` `        ``else` `            ``score -= ``pow``(chunkSize, 2); ` `    ``} ` ` `  `    ``// Return the score ` `    ``return` `score; ` `} ` ` `  `// Driver code ` `int` `main() ` `{ ` `    ``string str = ``"11011"``; ` `    ``cout << calcScore(str); ` ` `  `    ``return` `0; ` `} `

## Java

 `// Java implementation of the approach  ` `class` `GFG  ` `{ ` `     `  `    ``// Function to return the score for  ` `    ``// the given binary string  ` `    ``public` `static` `int` `calcScore(String str)  ` `    ``{  ` `        ``int` `score = ``0``;  ` `        ``int` `len = str.length();  ` ` `  `        ``// Traverse through string character  ` `        ``for` `(``int` `i = ``0``; i < len;)  ` `        ``{  ` ` `  `            ``// Initialize current chunk's size  ` `            ``int` `chunkSize = ``1``;  ` ` `  `            ``// Get current character  ` `            ``char` `currentChar = str.charAt(i++);  ` ` `  `            ``// Calculate total chunk size  ` `            ``// of same characters  ` `            ``while` `(i < len && str.charAt(i) == currentChar)  ` `            ``{  ` `                ``chunkSize++;  ` `                ``i++;  ` `            ``}  ` ` `  `            ``// Add/subtract pow(chunkSize, 2)  ` `            ``// depending upon character  ` `            ``if` `(currentChar == ``'1'``)  ` `                ``score += Math.pow(chunkSize, ``2``);  ` `            ``else` `                ``score -= Math.pow(chunkSize, ``2``);  ` `        ``} ` `         `  `        ``// Return the score  ` `        ``return` `score;  ` `    ``}  ` ` `  `    ``// Driver code  ` `    ``public` `static` `void` `main(String[] args) ` `    ``{  ` `        ``String str = ``"11011"``;  ` `        ``System.out.println(calcScore(str));  ` `    ``}  ` `} ` ` `  `// This code is contributed by Naman_Garg `

## Python3

 `# Python 3 implementation of the approach ` ` `  `# Function to return the score for ` `# the given binary string ` `def` `calcScore(``str``): ` `    ``score ``=` `0` `    ``len1 ``=` `len``(``str``) ` ` `  `    ``# Traverse through string character ` `    ``i ``=` `0` `    ``while``(i < len1): ` `         `  `        ``# Initialize current chunk's size ` `        ``chunkSize ``=` `1` ` `  `        ``# Get current character ` `        ``currentChar ``=` `str``[i] ` `        ``i ``+``=` `1` ` `  `        ``# Calculate total chunk size ` `        ``# of same characters ` `        ``while` `(i < len1 ``and` `str``[i] ``=``=` `currentChar): ` `            ``chunkSize ``+``=` `1` `            ``i ``+``=` `1` ` `  `        ``# Add/subtract pow(chunkSize, 2) ` `        ``# depending upon character ` `        ``if` `(currentChar ``=``=` `'1'``): ` `            ``score ``+``=` `pow``(chunkSize, ``2``) ` `        ``else``: ` `            ``score ``-``=` `pow``(chunkSize, ``2``) ` ` `  `    ``# Return the score ` `    ``return` `score ` ` `  `# Driver code ` `if` `__name__ ``=``=` `'__main__'``: ` `    ``str` `=` `"11011"` `    ``print``(calcScore(``str``)) ` ` `  `# This code is contributed by ` `# Surendra_Gangwar `

## C#

 `// C# implementation of the approach  ` `using` `System; ` `     `  `class` `GFG  ` `{ ` `     `  `    ``// Function to return the score for  ` `    ``// the given binary string  ` `    ``public` `static` `int` `calcScore(String str)  ` `    ``{  ` `        ``int` `score = 0;  ` `        ``int` `len = str.Length;  ` ` `  `        ``// Traverse through string character  ` `        ``for` `(``int` `i = 0; i < len;)  ` `        ``{  ` ` `  `            ``// Initialize current chunk's size  ` `            ``int` `chunkSize = 1;  ` ` `  `            ``// Get current character  ` `            ``char` `currentChar = str[i++];  ` ` `  `            ``// Calculate total chunk size  ` `            ``// of same characters  ` `            ``while` `(i < len && str[i] == currentChar)  ` `            ``{  ` `                ``chunkSize++;  ` `                ``i++;  ` `            ``}  ` ` `  `            ``// Add/subtract pow(chunkSize, 2)  ` `            ``// depending upon character  ` `            ``if` `(currentChar == ``'1'``)  ` `                ``score += (``int``)Math.Pow(chunkSize, 2);  ` `            ``else` `                ``score -= (``int``)Math.Pow(chunkSize, 2);  ` `        ``} ` `         `  `        ``// Return the score  ` `        ``return` `score;  ` `    ``}  ` ` `  `    ``// Driver code  ` `    ``public` `static` `void` `Main(String[] args) ` `    ``{  ` `        ``String str = ``"11011"``;  ` `        ``Console.WriteLine(calcScore(str));  ` `    ``}  ` `} ` ` `  `// This code contributed by Rajput-Ji `

## PHP

 ` `

Output:

```7
```

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