View Compilation Error

0_0_37536026_3822.cpp: In function 'int main()':
0_0_37536026_3822.cpp:9:17: error: 'Maxn' was not declared in this scope
         int len[Maxn];//绳子
                 ^
0_0_37536026_3822.cpp:14:13: error: 'len' was not declared in this scope
             len[i]=t*100.0;
             ^
0_0_37536026_3822.cpp:16:14: error: 'len' was not declared in this scope
         sort(len,len+N);//排序，直接找最大值
              ^