View Compilation Error

0_0_18532679_3114.c: In function 'Build':
0_0_18532679_3114.c:22:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
     for(int i=l;i<=mid;i++)
     ^
0_0_18532679_3114.c:22:5: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_18532679_3114.c:24:13: error: redefinition of 'i'
     for(int i=l;i<=r;i++)
             ^
0_0_18532679_3114.c:22:13: note: previous definition of 'i' was here
     for(int i=l;i<=mid;i++)
             ^
0_0_18532679_3114.c:24:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
     for(int i=l;i<=r;i++)
     ^
0_0_18532679_3114.c: In function 'main':
0_0_18532679_3114.c:57:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int i=1;i<=n;i++)
         ^