Hopscotch(codeforces 141B)
作者:互联网
Hopscotch
time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard outputSo nearly half of the winter is over and Maria is dreaming about summer. She's fed up with skates and sleds, she was dreaming about Hopscotch all night long. It's a very popular children's game. The game field, the court, looks as is shown in the figure (all blocks are square and are numbered from bottom to top, blocks in the same row are numbered from left to right). Let us describe the hopscotch with numbers that denote the number of squares in the row, staring from the lowest one: 1-1-2-1-2-1-2-(1-2)..., where then the period is repeated (1-2).
The coordinate system is defined as shown in the figure. Side of all the squares are equal and have length a.
Maria is a very smart and clever girl, and she is concerned with quite serious issues: if she throws a stone into a point with coordinates (x, y), then will she hit some square? If the answer is positive, you are also required to determine the number of the square.
It is believed that the stone has fallen into the square if it is located strictly inside it. In other words a stone that has fallen on the square border is not considered a to hit a square.
InputThe only input line contains three integers: a, x, y, where a (1 ≤ a ≤ 100) is the side of the square, x and y ( - 106 ≤ x ≤ 106, 0 ≤ y ≤ 106) are coordinates of the stone.
OutputPrint the number of the square, inside which the stone fell. If the stone is on a border of some stone or outside the court, print "-1" without the quotes.
Examples Input Copy1 0 0Output Copy
-1Input Copy
3 1 1Output Copy
1Input Copy
3 0 10Output Copy
5Input Copy
3 0 7Output Copy
-1Input Copy
3 4 0Output Copy
-1
#include<iostream> #include<cstdio> #include<cmath> using namespace std; int main(){ double a, x, y; scanf("%lf %lf %lf", &a, &x, &y); if(x>=a || x<=-a || !((int)y%(int)a)) puts("-1"); else{ int flr = (int)y/(int)a + 1; if(flr==1){ if(x > -a/2 && x < a/2 && y > 0 && y < a) puts("1"); else puts("-1"); }else{ int flag = 1; int num = (flr - 1) / 2 * 3 + 1; if((flr - 1) % 2 == 0) flag = 2; if(flag==1){ num++; double up = flr * a, bot = up - a, lef = -a/2.0, rig = a/2.0; if(y<up && y >bot && x>lef && x<rig) printf("%d\n", num); else puts("-1"); }else{ double up = flr * a, bot = up - a, lef1 = -a, rig1 = 0, lef2 = 0, rig2 = a; if(y<up && y>bot && x>lef1 && x<rig1) printf("%d\n",num-1); else if(y<up && y>bot && x>lef2 && x<rig2) printf("%d\n",num); else puts("-1"); } } } return 0; }
标签:stone,square,Hopscotch,141B,codeforces,&&,Output,Input,Copy 来源: https://www.cnblogs.com/LS-Joze/p/11666779.html