View Compilation Error

0_0_18073488_1746.cpp: In function 'bool cmp(node, node)':
0_0_18073488_1746.cpp:17:25: error: 'strcmp' was not declared in this scope
  if(strcmp(a.type,b.type)==0) return a.qua>b.qua;
                         ^
0_0_18073488_1746.cpp: In function 'int main()':
0_0_18073488_1746.cpp:64:26: error: 'memset' was not declared in this scope
    memset(wz,0,sizeof(wz));
                          ^
0_0_18073488_1746.cpp:67:42: error: 'strcmp' was not declared in this scope
     if(strcmp(elem[i].type,elem[i-1].type)!=0)
                                          ^
0_0_18073488_1746.cpp: At global scope:
0_0_18073488_1746.cpp:89:2: error: expected unqualified-id before '<' token
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  ^