Poj.2590 Steps【“英語題”,水】 2015/09/22
阿新 • • 發佈:2019-01-27
Steps
What is the minimum number of steps in order to get from x to y? The length of the first and the last step must be 1.
Input consists of a line containing n, the number of test cases.
同ZOJ1871
Time Limit: 1000MS | Memory Limit: 65536K |
Total Submissions: 7825 | Accepted: 3600 |
Description
One steps through integer points of the straight line. The length of a step must be nonnegative and can be by one bigger than, equal to, or by one smaller than the length of the previous step.What is the minimum number of steps in order to get from x to y? The length of the first and the last step must be 1.
Input
Output
For each test case, a line follows with two integers: 0 <= x <= y < 2^31. For each test case, print a line giving the minimum number of steps to get from x to y.Sample Input
3 45 48 45 49 45 50
Sample Output
3 3 4
Source
#include<iostream> #include<cstdio> #include<cstring> #include<cmath> using namespace std; int main(){ int from,to,t; cin>>t; while( t-- ){ scanf("%d%d",&from,&to); int dis = to - from; if( !dis ){ printf("0\n"); continue; } int x = 0,i,step; for( i = 1 ; ; ++i ){ if( x + i * 2 >= dis ) break; x += i*2; } step = i*2-2; if( x+i*2 == dis ) printf("%d\n",step+2); else if( x+i >= dis ) printf("%d\n",step+1); else printf("%d\n",step+2); } return 0; }