278. First Bad Version LeetCode
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题意:寻找第一个坏的版本。坏版本之后的都是坏版本。
题解:二分。
// Forward declaration of isBadVersion API.bool isBadVersion(int version);class Solution {public: int firstBadVersion(int n) { long long l = 1,r = n,mid; while(l < r) { mid = (l + r) / 2; if(isBadVersion(mid)) r = mid; else l = mid + 1; } return r; }};
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