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View Compilation Error

0_0_22103547_9702.c:5:7: error: variably modified 'a' at file scope
 int n,a[3*MAX],b[3*MAX];
       ^
0_0_22103547_9702.c:5:16: error: variably modified 'b' at file scope
 int n,a[3*MAX],b[3*MAX];
                ^
0_0_22103547_9702.c: In function 'main':
0_0_22103547_9702.c:11:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int i=1;i<=n;i++)
   ^
0_0_22103547_9702.c:11:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_22103547_9702.c:16:11: error: redefinition of 'i'
   for(int i=1;i<=n;i++)
           ^
0_0_22103547_9702.c:11:11: note: previous definition of 'i' was here
   for(int i=1;i<=n;i++)
           ^
0_0_22103547_9702.c:16:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int i=1;i<=n;i++)
   ^
0_0_22103547_9702.c:26:11: error: redefinition of 'i'
   for(int i=1;i<=2*n;i++)  
           ^
0_0_22103547_9702.c:16:11: note: previous definition of 'i' was here
   for(int i=1;i<=n;i++)
           ^
0_0_22103547_9702.c:26:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int i=1;i<=2*n;i++)  
   ^


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