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View Compilation Error

0_0_24070885_31441.c: In function 'main':
0_0_24070885_31441.c:37:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int q=len-1;q>=0;q--){
   ^
0_0_24070885_31441.c:37:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code


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