2023年开始用luogu，这是我的第一个MLE。

#include <iostream>

#define maxn 26

using namespace std;

int l[maxn], r[maxn], mid[maxn];

int findLine(int pt) {
    for (int i = 0; i < maxn; i++) {
        if (mid[i] == pt) {
            return i;
        }
    }
    return 0;
}

void dfs(int pt) {
    int line = findLine(pt);
    cout << char(pt);
    if (l[line] != int('*')) {
        dfs(l[line]);
    }
    if (r[line] != int('*')) {
        dfs(r[line]);
    }
    return;
}

int main() {
    int n;
    char temp[3];
    cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> temp;
        mid[i] = int(temp[0]);
        l[i] = int(temp[1]);
        r[i] = int(temp[2]);
    }
    dfs(mid[0]);
    return 0;
}

输出：

abbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
b...（共1048576个b）

run: line 1:     3 File size limit exceeded
(core dumped) LD_LIBRARY_PATH=/usr/local/gc
c-9.2.0/lib64 ./a.out

Exited with error status 153

$总字符数$	$字符数(不包含空白字符)$	$单词数$	$段落数$
$1048577$	$1048576$	$1$	$1$