View Compilation Error

0_0_36724811_21959.c:3:5: error: variably modified 'a' at file scope
 int a[MAX];
     ^
0_0_36724811_21959.c: In function 'main':
0_0_36724811_21959.c:14:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for(int i=1;i<=N;i++)
    ^
0_0_36724811_21959.c:14:4: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_36724811_21959.c:17:12: error: redefinition of 'i'
    for(int i=2;i<=N;i++)
            ^
0_0_36724811_21959.c:14:12: note: previous definition of 'i' was here
    for(int i=1;i<=N;i++)
            ^
0_0_36724811_21959.c:17:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for(int i=2;i<=N;i++)
    ^