>输入格式</h4><div class="ui bottom attached segment font-content"><div style="position: relative; overflow: hidden;"><div class=content><p>The first line of input contains three positive integers: n (the number of directories other than the root directory), m (the number of files), and k (the desired path name length). The root directory has number 0, and all the remaining directories are numbered 1 through n. Files are numbered 1 through m. The second line contains the length s of the introduced symli