View Compilation Error

0_0_38602313_1894.cpp:6:16: error: 'struct std' redeclared as different kind of symbol
 typedef struct std
                ^~~
<built-in>: note: previous declaration 'namespace std { }'
0_0_38602313_1894.cpp:9:2: error: 'typedef int std' redeclared as different kind of symbol
 }std;
  ^~~
<built-in>: note: previous declaration 'namespace std { }'
0_0_38602313_1894.cpp:10:1: error: 'std' does not name a type
 std a[101];
 ^~~
0_0_38602313_1894.cpp: In function 'int main()':
0_0_38602313_1894.cpp:34:18: error: 'a' was not declared in this scope
             gets(a[i].str);
                  ^
0_0_38602313_1894.cpp:37:28: error: 'a' was not declared in this scope
                 if (strlen(a[i].str) < strlen(a[j].str))
                            ^
0_0_38602313_1894.cpp:39:32: error: 'a' was not declared in this scope
         for (i = 0; i < strlen(a[0].str); i++)
                                ^