View Compilation Error

0_0_38529588_27046.c: In function 'meisushu':
0_0_38529588_27046.c:18:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
     for (int i = l; i < r; i++)
     ^
0_0_38529588_27046.c:18:5: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_38529588_27046.c:34:13: error: expected ';' before '}' token
             }
             ^