Cao Cao made up a big army and was going to invade the whole South China. Yu Zhou was worried about it. He thought the only way to beat Cao Cao is to have a spy in Cao Cao's army. But all generals and soldiers of Cao Cao were loyal, it's impossible to convince any of them to betray Cao Cao.
Cao Cao made up a big army and was going to
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C - The Battle of Chibi HDU - 5542 (树状数组+离散化)
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