View Compilation Error

0_0_22258931_20520.cpp:11:9: error: 'M' was not declared in this scope
 int ans[M];
         ^
0_0_22258931_20520.cpp: In member function 'void AC::find(char*, int)':
0_0_22258931_20520.cpp:81:49: error: 'ans' was not declared in this scope
                 if(height[temp]<=h&&val[temp])  ans[temp]++;
                                                 ^
0_0_22258931_20520.cpp: In function 'int main()':
0_0_22258931_20520.cpp:125:27: error: 'ans' was not declared in this scope
             printf("%d\n",ans[pos[i]] );
                           ^