View Compilation Error

0_0_25709230_27781.cpp:8:23: error: 'M' was not declared in this scope
 int e[N][N],q[N],flag[M],slack[N];
                       ^
0_0_25709230_27781.cpp: In function 'void KM(int)':
0_0_25709230_27781.cpp:15:9: error: 'flag' was not declared in this scope
  memset(flag,0,sizeof(flag));
         ^