微策略2012年校园招聘笔试题-棋盘寻宝


http://www.acmerblog.com/blog-2-1240.html
现在有一个8*8的棋盘,上面放着64个价值不等的礼物,每个小的棋盘上面放置一个礼物(礼物的价值大于0小于1000),一个人的初始位置在棋盘的左上角,每次他只能向下或向右移动一步,并拿走对应棋盘上的礼物,结束位置在棋盘的右下角,请设计一个算法使其能够获得最大价值的礼物。

简单的动态规划,最优子结构很明显。 dp[i][j]能取得的最大值,取决于dp[i-1][j],dp[i][j-1]的最大值这里对第一行和第一列单独处理,因为只能向右和向下。map[i][j] += max(map[i-1][j], map[i][j-1])
01#include <stdio.h>
02int map[8][8], i, j, ans;
03int main() {
04    while (~scanf("%d", &map[0][0])) {
05        for (j = 1; j < 8; j++) {
06            scanf("%d", &map[0][j]);
07            map[0][j] += map[0][j - 1];
08        }
09        for (i = 1; i < 8; i++) {
10            scanf("%d", &map[i][0]);
11            map[i][0] += map[i - 1][0];
12            for (j = 1; j < 8; j++) {
13                scanf("%d", &map[i][j]);
14                map[i][j] += (
15                        map[i][j - 1] > map[i - 1][j] ?
16                                map[i][j - 1] : map[i - 1][j]);
17            }
18        }
19        printf("%d\n", map[7][7]);
20    }
21    return 0;
22}

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