View Compilation Error

0_0_32383317_215.c: In function 'main':
0_0_32383317_215.c:10:3: error: unknown type name 'bool'
   bool flag=true;
   ^
0_0_32383317_215.c:10:13: error: 'true' undeclared (first use in this function)
   bool flag=true;
             ^
0_0_32383317_215.c:10:13: note: each undeclared identifier is reported only once for each function it appears in
0_0_32383317_215.c:13:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int i=0;i<l;i++)
         ^
0_0_32383317_215.c:13:9: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_32383317_215.c:17:22: error: 'false' undeclared (first use in this function)
                 flag=false;
                      ^
0_0_32383317_215.c:46:17: error: redefinition of 'i'
         for(int i=u;i<l;)
                 ^
0_0_32383317_215.c:13:17: note: previous definition of 'i' was here
         for(int i=0;i<l;i++)
                 ^
0_0_32383317_215.c:46:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int i=u;i<l;)
         ^