52 lines
910 B
C
52 lines
910 B
C
#include <leetcode/utils.h>
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#include <stdio.h>
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static int pick = 0;
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/**
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* Forward declaration of guess API.
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* @param num your guess
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* @return -1 if num is higher than the picked number
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* 1 if num is lower than the picked number
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* otherwise return 0
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* int guess(int num);
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*/
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int guess(int num)
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{
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if (num > pick)
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return -1;
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if (num < pick)
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return 1;
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return 0;
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}
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int guessNumber(int n)
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{
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int low = 1, high = n;
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while (low < high)
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{
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int res = guess((low + high) / 2);
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if (res == -1)
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high = (n + 1) / 2;
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else if (res == 1)
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low = (low + high) / 2;
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else
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return res;
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}
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return high + guess(high);
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}
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int main()
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{
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pick = 6;
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ASSERT(guessNumber(10), pick, fail);
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pick = 1;
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ASSERT(guessNumber(2), pick, fail);
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return 0;
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fail:
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return -1;
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} |