hdu - 4452 - Running Rabbits
题意:一个N*N的正方形田野分成1*1的格子,有两只兔子,Tom在左上角(1, 1),Jerry在右下角(N, N),它们可以沿东南西北4个方向走,但不可出格,各有各的速度,相遇时,两只兔子交换移动方向,碰边界时反向,各自还有自己的转左周期,周期一到即转左(但此时两只兔子相遇就不执行此周期转左),问K小时后两只兔子的坐标。——>>照着走就是了。
边界处理:若N = 5,
右或下出界:
x(或y)直接取模2*N-2
1234543212345432123……周期为2*5-2,存入数组a;
左或上出界:
x(或y) 变成1 - x(或1 - y)再取模2*N-2
……123454321234543212345周期为2*5-2,存入数组b;
开始没注意到speed( 1≤s<N),以为会来回改变方向多次,写多写错……其实挺水,这题……
[cpp]
#include <cstdio>
#include <algorithm>
using namespace std;
int N, a[50], b[50];
void turn(char& c) //转左
{
switch(c)
{
case 'E': c = 'N'; break;
case 'S': c = 'E'; break;
case 'W': c = 'S'; break;
case 'N': c = 'W'; break;
}
}
void moveto(char& c, int s, int& x, int& y) //移步
{
switch(c)
{
case 'E':
{
y += s;
if(y > N)
{
y = a[y%(2*N-2)];
c = 'W';
}
break;
}
case 'S':
{
x += s;
if(x > N)
{
x = a[x%(2*N-2)];
c = 'N';
}
break;
}
case 'W':
{
y -= s;
if(y < 1)
{
y = b[(1-y)%(2*N-2)];
c = 'E';
}
break;
}
case 'N':
{
x -= s;
if(x < 1)
{
x = b[(1-x)%(2*N-2)];
c = 'S';
}
break;
}
}
}
int main()
{
int K, T_s, T_t, J_s, J_t, i;
char T_c, J_c;
while(~scanf("%d", &N))
{
if(!N) return 0;
scanf("\n%c%d%d", &T_c, &T_s, &T_t);
scanf("\n%c%d%d", &J_c, &J_s, &J_t);
scanf("%d", &K);
int T_x = 1, T_y = 1, J_x = N, J_y = N;
a[0] = 2;
for(i = 1; i <= N; i++) a[i] = i;
for(i = N+1; i <= 2*N-3; i++) a[i] = 2*N-i;
b[0] = 1;
for(i = 1; i <= N-1; i++) b[i] = i+1;
for(i = N; i <= 2*N-3; i++) b[i] = 2*N-i-1;
for(i = 1; i <= K; i++)
{
moveto(T_c, T_s, T_x, T_y);
moveto(J_c, J_s, J_x, J_y);
if(T_x == J_x && T_y == J_y) swap(T_c, J_c);
else
{
if(i % T_t == 0) turn(T_c);
if(i % J_t == 0) turn(J_c);
}
}
printf("%d %d\n", T_x, T_y);
printf("%d %d\n", J_x, J_y);
}
return 0;
}
补充:软件开发 , C++ ,