Python program using map function to find row with maximum number of 1's

In this article, we will learn how to use map function to find row with maximum number of 1's. 2D array is given and the elements of the arrays are 0 and 1. All rows are sorted. We have to find row with maximum number of 1's. Here we use map (). The map function is the simplest one among Python built-ins used for functional programming. These tools apply functions to sequences and other iterables.

Let?s say the input is the following array ?

[[0, 1, 1, 1, 1],[0, 0, 1, 1, 1],[1, 1, 1, 1, 1],[0, 0, 0, 0, 1]]

Output displays the row with maximum number of 1s ?

2

Find row with maximum number of 1's

In this example, we will find a row with maximum number of 1?s using the map() function ?

Example

<div class="execute"></div><div class="code-mirror  language-python" contenteditable="plaintext-only" spellcheck="false" style="outline: none; overflow-wrap: break-word; overflow-y: auto; white-space: pre-wrap;"><span class="token keyword">def</span> <span class="token function">maximumFunc</span><span class="token punctuation">(</span>n<span class="token punctuation">)</span><span class="token punctuation">:</span>
	max1 <span class="token operator">=</span> <span class="token builtin">list</span><span class="token punctuation">(</span><span class="token builtin">map</span><span class="token punctuation">(</span><span class="token builtin">sum</span><span class="token punctuation">,</span>n<span class="token punctuation">)</span><span class="token punctuation">)</span>
	<span class="token keyword">print</span> <span class="token punctuation">(</span><span class="token string">"Row with maximum number of 1s = "</span><span class="token punctuation">,</span>max1<span class="token punctuation">.</span>index<span class="token punctuation">(</span><span class="token builtin">max</span><span class="token punctuation">(</span>max1<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span>

<span class="token comment"># Driver program</span>
<span class="token keyword">if</span> __name__ <span class="token operator">==</span> <span class="token string">"__main__"</span><span class="token punctuation">:</span>
	n <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">,</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">,</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">]</span>
	maximumFunc<span class="token punctuation">(</span>n<span class="token punctuation">)</span>
</div><div class="output-wrapper"><div class="console-close"></div><div class="code-output"></div></div>

Output

Row with maximum number of 1s = 2

Find row with maximum number of 1's using for loop

In this example, we will find a row with maximum number of 1?s using a for loop simply ?

Example

<div class="execute"></div><div class="code-mirror  language-python" contenteditable="plaintext-only" spellcheck="false" style="outline: none; overflow-wrap: break-word; overflow-y: auto; white-space: pre-wrap;">m <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">,</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">,</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">]</span>
mrows <span class="token operator">=</span> <span class="token builtin">len</span><span class="token punctuation">(</span>m<span class="token punctuation">)</span>

max1 <span class="token operator">=</span> <span class="token number">0</span>

<span class="token keyword">for</span> k <span class="token keyword">in</span> <span class="token builtin">range</span><span class="token punctuation">(</span>mrows<span class="token punctuation">)</span><span class="token punctuation">:</span>
	c <span class="token operator">=</span> m<span class="token punctuation">[</span>k<span class="token punctuation">]</span><span class="token punctuation">.</span>count<span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span>
	
<span class="token keyword">if</span><span class="token punctuation">(</span>c <span class="token operator">>=</span> max1<span class="token punctuation">)</span><span class="token punctuation">:</span>
	max1 <span class="token operator">=</span> c
	res <span class="token operator">=</span> k<span class="token operator">+</span><span class="token number">1</span>
	
<span class="token keyword">print</span><span class="token punctuation">(</span><span class="token string">"The row with maximum number of 1s = "</span><span class="token punctuation">,</span> res<span class="token punctuation">)</span>
</div><div class="output-wrapper"><div class="console-close"></div><div class="code-output"></div></div>

Output

The row with maximum number of 1s = 3