View Compilation Error

0_0_21675645_24311.cpp: In function 'int main()':
0_0_21675645_24311.cpp:25:32: error: 'strlen' was not declared in this scope
             len[i]=strlen(cache);
                                ^
0_0_21675645_24311.cpp:50:35: error: 'strcmp' was not declared in this scope
        if(strcmp(value[k],value[j])==0) goto next;
                                   ^