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Re:这题怎么做才好呢,求大牛给个提示吧!!!In Reply To:这题怎么做才好呢,求大牛给个提示吧!!! Posted by:200740442 at 2010-07-05 16:15:28 用dp求解, 设数组为map[i][j][k],其中i代表位数,j代表n位的和,k代表最后一位是0还是1,然后又一下等式:如果最后一位是0 则 map[i][j][0]=map[i-1][j][0]+map[i-1][j][1];
如果最后一位是1 则 map[i][j][1]=map[i-1][j][0]+map[i-1][j-1][1];
注意结果是 map[n][k][0]+map[n][k][1];
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