View Compilation Error

0_0_38755185_18962.cpp:8:1: error: expected ',' or ';' before 'const'
    8 | const int M=400;
      | ^~~~~
0_0_38755185_18962.cpp: In function 'void gg(int, int, int)':
0_0_38755185_18962.cpp:20:24: error: 'M' was not declared in this scope
   20 |       if (pd(now+i)) f[M+i]+=z;
      |                        ^
0_0_38755185_18962.cpp: In function 'int main()':
0_0_38755185_18962.cpp:59:38: error: 'M' was not declared in this scope
   59 |                   tt=max(tt,f[j-a[i]+M]);
      |                                      ^