这到题应该怎么做啊？

<span class="hljs-function"><span class="hljs-type">int</span> <span class="hljs-title">main</span><span class="hljs-params">()</span>
</span>{
    <span class="hljs-type">int</span> k = <span class="hljs-number">0</span>;
    <span class="hljs-type">int</span> i, j,m;
    <span class="hljs-keyword">for</span> (i = <span class="hljs-number">0</span>; i <= <span class="hljs-number">2</span>; i++)
    {
        <span class="hljs-keyword">for</span> (j = <span class="hljs-number">0</span>; j < <span class="hljs-number">3</span>; j++)<span class="hljs-comment">//一共循环3次，当j=3的时候跳出循环，这个时候k自加了三次，变成3</span>
            k++;
        k = k - j;<span class="hljs-comment">//k-j就是3-3=0,所以k的值是0        </span>
    }
    m = i + j;<span class="hljs-comment">//同理，i的值也是3，所以m的值是6</span>
    <span class="hljs-keyword">return</span> <span class="hljs-number">0</span>;
}