View Compilation Error

0_0_23629423_23428.cpp:1:1: error: expected unqualified-id before 'for'
 for(int i=0;i<n;i++)//n为输入序列的长度
 ^
0_0_23629423_23428.cpp:1:13: error: 'i' does not name a type
 for(int i=0;i<n;i++)//n为输入序列的长度
             ^
0_0_23629423_23428.cpp:1:17: error: 'i' does not name a type
 for(int i=0;i<n;i++)//n为输入序列的长度
                 ^