View Compilation Error

0_0_20816338_2197.cpp: In function 'int manacher(int*)':
0_0_20816338_2197.cpp:20:29: error: 'memset' was not declared in this scope
     memset( p, 0, sizeof(p) );
                             ^
0_0_20816338_2197.cpp:26:9: error: 'j' was not declared in this scope
     str[j] = -1;
         ^
0_0_20816338_2197.cpp:31:11: error: 'i' was not declared in this scope
     for ( i = 0; i < len; i++ ){
           ^