View Compilation Error

0_0_38115697_10214.c:5:1: error: unknown type name 'bool'
 bool flag = false;
 ^
0_0_38115697_10214.c:5:13: error: 'false' undeclared here (not in a function)
 bool flag = false;
             ^
0_0_38115697_10214.c: In function 'init':
0_0_38115697_10214.c:9:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
  for (int i = 0; i < 100002; i++)
  ^
0_0_38115697_10214.c:9:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_38115697_10214.c: In function 'merge':
0_0_38115697_10214.c:32:10: error: 'true' undeclared (first use in this function)
   flag = true;
          ^
0_0_38115697_10214.c:32:10: note: each undeclared identifier is reported only once for each function it appears in
0_0_38115697_10214.c: In function 'main':
0_0_38115697_10214.c:65:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for (int i = 0; i < 100002; i++)
   ^