View Compilation Error

0_0_17355147_21415.c: In function 'slove':
0_0_17355147_21415.c:6:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
  for(int i=d+1;i<=end;i++){
  ^
0_0_17355147_21415.c:6:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_17355147_21415.c:8:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int j=0;j<31;j++){
   ^
0_0_17355147_21415.c: In function 'main':
0_0_17355147_21415.c:25:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int i=0;i<n;i++){
   ^