Uva 11520 - Fill the Square 贪心 难度: 0

题目

https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=2515

题意

n*n矩阵中填入大写字母，n <= 10，要求从上到下从左到右字母序最小，相邻格子字母不同

思路

如刘书思路，状态比较小，不会导致矛盾。

感想

1. 状态较小

代码

#include <algorithm>
#include <cassert>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <map>
#include <queue>
#include <set>
#include <tuple>
#define LOCAL_DEBUG
using namespace std;
typedef pair<double, int> MyPair;
const int MAXN = ;
int dx[] = { , -, ,  };
int dy[] = { , , , - };
char maze[MAXN][MAXN];
bool used[];
void fillin(int i, int j, int n) {
    memset(used, , sizeof used);
    for (int di = ; di < ; di++) {
        int tx = i + dx[di];
        int ty = j + dy[di];
        if ( > tx || tx >= n)continue;
        if ( > ty || ty >= n)continue;
        if (maze[tx][ty] == '.')continue;
        used[maze[tx][ty] - 'A'] = true;
    }
}

int main() {
#ifdef LOCAL_DEBUG
    freopen("C:\\Users\\Iris\\source\\repos\\ACM\\ACM\\input.txt", "r", stdin);
    //freopen("C:\\Users\\Iris\\source\\repos\\ACM\\ACM\\output.txt", "w", stdout);
#endif // LOCAL_DEBUG
    int T;
    scanf("%d", &T);
    for (int ti = ; ti <= T; ti++) {
        int n;
        scanf("%d", &n);
        for (int i = ; i < n; i++)scanf("%s", maze + i);
        for (int i = ; i < n; i++) {
            for (int j = ; j < n; j++) {
                if (maze[i][j] != '.')continue;
                fillin(i, j, n);
                for (char c = 'A'; c <= 'Z'; c++) {
                    if (!used[c - 'A']) {
                        maze[i][j] = c;
                        break;
                    }
                }
            }
        }
        printf("Case %d:\n", ti);
        for (int i = ; i < n; i++)printf("%s\n", maze[i]);

    }

    return ;
}