leetcode/src/278.c at master · lennylxx/leetcode · GitHub

Name: leetcode/src/278.c at master · lennylxx/leetcode · GitHub
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#include<stdio.h>
#include<stdbool.h>
#include<assert.h>

#defineBAD 3 // for testing

// Forward declaration of isBadVersion API.
boolisBadVersion(intversion) {
return (version >= BAD);
}

intfirstBadVersion(intn) {
if (n <= 1) returnn;

intlow=1;
inthigh=n;
intmid;
while (low <= high) {
mid=low+ (high-low) / 2;
if (isBadVersion(mid)) {
high=mid-1;
 }
else {
low=mid+1;
 }
 }

returnlow;
}

intmain() {

assert(firstBadVersion(3) ==3);
assert(firstBadVersion(4) ==3);
assert(firstBadVersion(5) ==3);
assert(firstBadVersion(6) ==3);
assert(firstBadVersion(7) ==3);
assert(firstBadVersion(8) ==3);
assert(firstBadVersion(9) ==3);

return0;
}