最初由 麦琪 发布
You guys find it not challenging? OK, here is another one.
The story takes place in a far-away country. In this country, there
are many married couples who seem to be happy. But the queen knows
better: She knows that there are husbands who cheat on their wives;
in fact, the queen knows that there is at least one unfaithful
husband.
The queen is sick of this and proposes the following: Starting on
January 1, if on a particular day, a woman finds out that her husband
is unfaithful, then the woman waits until 12 at night and then shoots
her husband.
Each woman does not know whether or not her husband is unfaithful, but
she knows exactly which other husbands are unfaithful.
On January 1, at 12 at night, all women open the windows of their
homes and listen. But, they don't hear shots.
On January 2, at 12 at night, all women open the windows of their
homes and listen. But, they don't hear shots.
On January 3, at 12 at night, all women open the windows of their
homes and listen. But, they don't hear shots.
Etc., etc.
On January 18, at 12 at night, all women open the windows of their
homes and listen. But, they don't hear shots.
On January 19, at 12 at night, all women open the windows of their
homes and listen. Now they hear shots.
Question: How many unfaithful husbands are there?