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== 沙盒区 ==
=== 1号沙盒 ===
缩进
:缩进
::缩进
<pre>#include<stdio.h>
int main(){
int n;
long long sum=0,m,i;
for(n=1;n<=20;n++){
for(m=1,i=n;i-1;i--)m*=i;
sum+=m;
}
printf("总和为：%lld\n",sum);
return 0;
}</pre>
=== 2号沙盒 ===
模板测试
<includeonly>开始{{{1}}}{{{2}}}{{{3}}}{{{1}}}结束</includeonly><noinclude>模板</noinclude>
=== 3号沙盒 ===
<ret>1</ret>
=== 4号沙盒 ===
测试
{{施工中}}
wawawa
=== 5号沙盒 ===
=== 6号沙盒 ===
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