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374.cpp
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374.cpp
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__________________________________________________________________________________________________
sample 4 ms submission
// Forward declaration of guess API.
// @param num, your guess
// @return -1 if my number is lower, 1 if my number is higher, otherwise return 0
int guess(int num);
class Solution {
public:
int guessNumber(int n) {
int l = 1, r = n;
while(l <= r) {
int mid = l + (r-l)/2;
int x = guess(mid);
if(x == 0) return mid;
else if(x == 1) l = mid + 1;
else r = mid - 1;
}
return -1;
}
};
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sample 7984 kb submission
// Forward declaration of guess API.
// @param num, your guess
// @return -1 if my number is lower, 1 if my number is higher, otherwise return 0
int guess(int num);
class Solution {
public:
int guessNumber(int n) {
if(n <= 0)
return 0;
if(n == 1)
return 1;
int start = 1;
int finish = n;
while(start <= finish){
if(guess(start) == 0)
return start;
if(guess(finish) == 0)
return finish;
int middle = start + (finish - start) / 2;
if(guess(middle) == 0)
return middle;
else if(guess(middle) < 0)
finish = middle - 1;
else
start = middle + 1;
}
return 0;
}
};
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