View Compilation Error

0_0_29979711_31737.cpp: In function 'int main()':
0_0_29979711_31737.cpp:62:8: error: 't' was not declared in this scope
 memset(t,0,sizeof(t));
        ^
0_0_29979711_31737.cpp:62:21: error: 'memset' was not declared in this scope
 memset(t,0,sizeof(t));
                     ^