For each exchange, your program needs to use standard output to send a **single
line** with one integer Q
I think the reason why you get TLE is that you need to print a newline for each
Q you print.
Also, your make a typical mistake writing the binary search.
If the input is A = 3 and B = 4, and the correct answer is 4, your code will
keep asking for Q = 3, and getting response that 3 is TOO_SMALL.
Here is the correct solution:
```C
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main() {
int T; //n cases
int A, B; //lower exlusive bound, upper inclusive bound
int N; //max number of guessing
int Q; //my try
char res[13];
int i, k;
scanf("%d", &T);
for (i = 1; i <= T; i++) { //stops after T cases
scanf("%d", &A);
scanf("%d", &B);
scanf("%d", &N);
for (k = 0; k < N; k++) { //stops after N tries
Q = (B + A + 1) / 2; //gets the avarage between min,max
fflush(stdout); //random fflush 1
printf("%d\n", Q);
fflush(stdout); //random fflush 2
scanf("%s", res); //get the answer from the machine
if (res[4] == 'S') //TOO_SMALL
A = Q;
else if (res[4] == 'B') //TOO_BIG
B = Q - 1;
else if (res[4] == 'E') //CORRECT
k = N;
else if (res[4] == 'G') //WRONG_ANSWER
return 0;
else
k = N; //just in case to make the run end
fflush(stdout); //random fflush 3
}
}
return 0;
}
```
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