POJ 1573 Robot Motion
2016-09-04 15:46
453 查看
Robot Motion
Description
A robot has been programmed to follow the instructions in its path. Instructions for the next direction the robot is to move are laid down in a grid. The possible instructions are
N north (up the page)
S south (down the page)
E east (to the right on the page)
W west (to the left on the page)
For example, suppose the robot starts on the north (top) side of Grid 1 and starts south (down). The path the robot follows is shown. The robot goes through 10 instructions in the grid before leaving the grid.
Compare what happens in Grid 2: the robot goes through 3 instructions only once, and then starts a loop through 8 instructions, and never exits.
You are to write a program that determines how long it takes a robot to get out of the grid or how the robot loops around.
Input
There will be one or more grids for robots to navigate. The data for each is in the following form. On the first line are three integers separated by blanks: the number of rows in the grid, the number of columns in the grid, and the number of the column in which the robot enters from the north. The possible entry columns are numbered starting with one at the left. Then come the rows of the direction instructions. Each grid will have at least one and at most 10 rows and columns of instructions. The lines of instructions contain only the characters N, S, E, or W with no blanks. The end of input is indicated by a row containing 0 0 0.
Output
For each grid in the input there is one line of output. Either the robot follows a certain number of instructions and exits the grid on any one the four sides or else the robot follows the instructions on a certain number of locations once, and then the instructions on some number of locations repeatedly. The sample input below corresponds to the two grids above and illustrates the two forms of output. The word "step" is always immediately followed by "(s)" whether or not the number before it is 1.
Sample Input
Sample Output
Source
Mid-Central USA 1999
解析:模拟。
Time Limit: 1000MS | Memory Limit: 10000K | |
Total Submissions: 12978 | Accepted: 6290 |
A robot has been programmed to follow the instructions in its path. Instructions for the next direction the robot is to move are laid down in a grid. The possible instructions are
N north (up the page)
S south (down the page)
E east (to the right on the page)
W west (to the left on the page)
For example, suppose the robot starts on the north (top) side of Grid 1 and starts south (down). The path the robot follows is shown. The robot goes through 10 instructions in the grid before leaving the grid.
Compare what happens in Grid 2: the robot goes through 3 instructions only once, and then starts a loop through 8 instructions, and never exits.
You are to write a program that determines how long it takes a robot to get out of the grid or how the robot loops around.
Input
There will be one or more grids for robots to navigate. The data for each is in the following form. On the first line are three integers separated by blanks: the number of rows in the grid, the number of columns in the grid, and the number of the column in which the robot enters from the north. The possible entry columns are numbered starting with one at the left. Then come the rows of the direction instructions. Each grid will have at least one and at most 10 rows and columns of instructions. The lines of instructions contain only the characters N, S, E, or W with no blanks. The end of input is indicated by a row containing 0 0 0.
Output
For each grid in the input there is one line of output. Either the robot follows a certain number of instructions and exits the grid on any one the four sides or else the robot follows the instructions on a certain number of locations once, and then the instructions on some number of locations repeatedly. The sample input below corresponds to the two grids above and illustrates the two forms of output. The word "step" is always immediately followed by "(s)" whether or not the number before it is 1.
Sample Input
3 6 5 NEESWE WWWESS SNWWWW 4 5 1 SESWE EESNW NWEEN EWSEN 0 0 0
Sample Output
10 step(s) to exit 3 step(s) before a loop of 8 step(s)
Source
Mid-Central USA 1999
解析:模拟。
#include <cstdio> #include <cstring> char s[15][15]; int n, m , start; int dis[15][15]; bool inGrid(int x, int y) { return 1 <= x && x <= n && 1 <= y && y <= m; } void solve() { memset(dis, 0, sizeof(dis)); int time = 0; int x = 1, y = start; while(1){ if(!inGrid(x, y)){ printf("%d step(s) to exit\n", time); break; } if(dis[x][y] != 0){ printf("%d step(s) before a loop of %d step(s)\n", dis[x][y]-1, time-dis[x][y]+1); break; } dis[x][y] = ++time; if(s[x][y] == 'N') --x; else if(s[x][y] == 'S') ++x; else if(s[x][y] == 'E') ++y; else if(s[x][y] == 'W') --y; } } int main() { while(scanf("%d%d%d", &n, &m, &start), n){ for(int i = 1; i <= n; ++i) scanf("%s", &s[i][1]); solve(); } return 0; }
相关文章推荐
- 迭代器
- 校招开篇第一次面试——打响校招的第一枪(一)
- hihocoder Boxes 状压八进制bfs 加预处理
- LeetCode 74. Search a 2D Matrix
- 模式识别之聚类
- dd命令中seek和skip的用法
- URI URN URL
- java获取域名Whois注册信息
- (一)@Input属性讨论
- 四校联考 tree3
- Mysql-5.6.30卸载
- PHP 通用检测函数集
- 第4章 表达式
- var React = require(“react”)的require是啥?
- C#控制台基础 调用非静态类的静态方法与非静态方法
- 归并排序
- poj1717&&vijos p1222(背包变形)
- 切勿辜负青春一场
- 0904总结
- Jsoup爬取360电影网上的信息