View Compilation Error

0_0_17683508_28470.cpp:8:25: error: conflicting declaration 'int M'
 int s[N],v[N],n,m,A,B,C,M,i;
                         ^
0_0_17683508_28470.cpp:6:11: note: previous declaration as 'const int M'
 const int M = 101010;
           ^
0_0_17683508_28470.cpp: In function 'int main()':
0_0_17683508_28470.cpp:98:17: error: assignment of read-only variable 'M'
  C = ~(1<<31),M = (1<<16)-1;
                 ^