View Compilation Error

0_0_31573627_32749.c:4:5: error: variably modified 'a' at file scope
 int a[MA];
     ^
0_0_31573627_32749.c: In function 'main':
0_0_31573627_32749.c:11:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
  for(int i=0;i<n;i++)
  ^
0_0_31573627_32749.c:11:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_31573627_32749.c:15:10: error: redefinition of 'i'
  for(int i=1;i<m;i++)
          ^
0_0_31573627_32749.c:11:10: note: previous definition of 'i' was here
  for(int i=0;i<n;i++)
          ^
0_0_31573627_32749.c:15:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
  for(int i=1;i<m;i++)
  ^