题目：

题解：

#define MAX(a, b) ((a) > (b) ? (a) : (b))int lengthLongestPath(char * input){int n = strlen(input);int pos = 0;int ans = 0;int * level = (int *)malloc(sizeof(int) * (n + 1));memset(level, 0, sizeof(int) * (n + 1));while (pos < n) {/* 检测当前文件的深度 */int depth = 1;while (pos < n && input[pos] == '\t') {pos++;depth++;}/* 统计当前文件名的长度 */bool isFile = false;  int len = 0;   while (pos < n && input[pos] != '\n') {if (input[pos] == '.') {isFile = true;}len++;pos++;}/* 跳过当前的换行符 */pos++;if (depth > 1) {len += level[depth - 1] + 1;}if (isFile) {ans = MAX(ans, len);} else {level[depth] = len;}}free(level);return ans;
}