问题 C: Repeat Number
时间限制: 1 Sec 内存限制: 128 MB提交: 23 解决: 7[][][]
题目描写叙述
Definition: a+b = c, if all the digits of c are same ( c is more than ten)。then we call a and b are Repeat Number. My question is How many Repeat Numbers in [x,y].
输入
There are several test cases.
Each test cases contains two integers x, y(1<=x<=y<=1,000,000) described above.
Proceed to the end of file.
输出
For each test output the number of couple of Repeat Number in one line.
例子输入
1 10 10 12
例子输出
5 2
提示
If a equals b, we can call a, b are Repeat Numbers too, and a is the Repeat Numbers for itself.
这道题,我是暴力加二分过的,枚举c的可能值就可以。然后求中间点与边界差的最小值就可以
#include#include #include #include #include #include using namespace std;vector G;void init(){ int k=1; for(int i=0;i<6;i++) { k=k*10+1; for(int j=1;j<=9;j++) G.push_back(k*j); }}int main(){ int x,y; init(); while(cin>>x>>y) { int p=lower_bound(G.begin(),G.end(),2*x)-G.begin(); int q=lower_bound(G.begin(),G.end(),2*y)-G.begin(); int ans=0; //for(int i=0;i<10;i++) // cout< < 2*y) q--; // cout< <<" "<
<< y-mid ? mid-x+1 : y-mid+1; else ans+= mid-x+1 < y-mid ? mid-x+1 : y-mid; } cout< <