UVa 227 Puzzle

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不知道为什么总是编译错误，未定义gets()。
#include <algorithm>  #include <iostream>  #include <cstdlib>  #include <stdio.h>#include <string.h>int main() {    //freopen("227.txt", "r", stdin);    char map[5][6], cmd;    int cases = 0;    while(gets(map[0])) {        if(!strcmp(map[0], "Z"))            break;        if(cases)            puts("");        printf("Puzzle #%d:\n", ++cases);        gets(map[1]), gets(map[2]), gets(map[3]), gets(map[4]);        int i, j, x, y;        for(i = 0; i < 5; i++) {            for(j = 0; j < 5; j++) {                if(map[i][j] == ' ' || map[i][j] == '\0')                    x = i, y = j;            }        }        int error = 0;        while(1) {            cmd = getchar();            if(cmd == 'A') {                if(x == 0) {                    error = 1;                    break;                }                map[x][y] = map[x-1][y];                x--;            } else if(cmd == 'B') {                if(x == 4) {                    error = 1;                    break;                }                map[x][y] = map[x+1][y];                x++;            } else if(cmd == 'L') {                if(y == 0) {                    error = 1;                    break;                }                map[x][y] = map[x][y-1];                y--;            } else if(cmd == 'R') {                if(y == 4) {                    error = 1;                    break;                }                map[x][y] = map[x][y+1];                y++;            } else if(cmd == '0')                break;        }        if(cmd != '0') {            while((cmd = getchar()) != '0');        }        while((cmd = getchar()) != '\n');        if(error)            puts("This puzzle has no final configuration.");        else {            map[x][y] = ' ';            for(i = 0; i < 5; i++) {                for(j = 0; j < 5; j++) {                    if(j)                        putchar(' ');                    putchar(map[i][j]);                }                puts("");            }        }        memset(map, 0, sizeof(map));    }    return 0;}
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