二分查找模板
二分查找
http://www.nowcoder.com/questionTerminal/7bc4a1c7c371425d9faa9d1b511fe193
/*
最左边n结束，>> 位移运算，low = mid + 1，high = mid;
*/
int upper_bound_(int n, int v, vector<int>& a) {
int low = 0,high = n;
while(low<high){
int mid =low+high >> 1;//位移运算优先级低于+-*/
a[mid]<v?low=mid+1:high=mid; //最先找到满足大于等于v的最小下标值
}
return low+1;
}
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