[UVA][模] 10116 - Robot Motion＠Morris' Blog｜PChome Online 人新台

Morris' Blog 我在摸索我存在的意、生命的意、涵及值。有真正神手般的害，套用模式是大部分的情。那害的我存在的意何，托出神的存在？有候不能怪人不我，我已始省思，什我有人的原因，而是全要靠人。有候我我不同，那是因我做不到很多人能到的事情。我不到、玩不起、得不明、理解得不多，我缺少的文能力，就是一切一切能的判定。此，我不得能做些人有助的事情。我知道我自己是不服的性格，但在我不得不。我有能力，因此我必。我到底世界作什？充不定性，而我是法出拔萃，想一般人似乎也回不了了。越大的挑需要越力的支持，而我的支持是什？最近人，但都是失的局，人能接受，不需要言，不需要通，一切所想都表不出。
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2012-05-28 21:59:00| 人1,441| 回0 | 上一篇 | 下一篇

[UVA][模] 10116 - Robot Motion

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Problem F: Robot Motion

Source file:	robot.{c, cpp, java, pas}
Input file:	robot.in
Output file:	robot.out

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.

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.

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.

Example input:

3 6 5 NEESWE WWWESS SNWWWW 4 5 1 SESWE EESNW NWEEN EWSEN 0 0 0

Example output:

10 step(s) to exit 3 step(s) before a loop of 8 step(s)

磨手感

#include <stdio.h>
#include <stdlib.h>

int main() {
    int r, c, s, i, j;
    while(scanf("%d %d %d", &r, &c, &s) == 3) {
        if(r == 0 && c == 0 && s == 0)
            break;
    &bsp;   char map[20][20];
        for(i = 0; i < r; i++)
            scanf("%s", map[i]);
        int used[20][20] = {};
        int x = 0, y = s-1, step = 0;
        for(i = 0; i < r; i++)
            for(j = 0; j < c; j++)
                used[i][j] = -1;
        used[x][y] = 0;
        while(1) {
            step++;
            if(map[x][y] == 'N')
                x--;
            else if(map[x][y] == 'S')
                x++;
            else if(map[x][y] == 'E')
                y++;
            else
                y--;
            if(x < 0 || y < 0 || x >= r || y >= c) {
                printf("%d step(s) to exit\n", step);
                break;
            }
            if(used[x][y] != -1) {
                printf("%d step(s) before a loop of %d step(s)\n", used[x][y], step-used[x][y]);
                break;
            }
            used[x][y] = step;
        }
    }
    return 0;
}