bool isBadVersion(int version);
class Solution {
public:
int firstBadVersion(int n) {
int l = 1;
int r = n;
while (l < r) {
const int m = l + (r - l) / 2;
if (isBadVersion(m))
r = m;
else
l = m + 1;
}
return l;
}
};
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