Li Changjiang, Duan Huanghe, Zhang Zhujiang, and He Haihe participated in a mathematical competition at the same time. After the match, they predicted each other's ranking together. Li Changjiang said: "Zhang Zhujiang is the first, and my third. " Duan Huanghe said: " "My first place is He Haihe fourth place. " Zhang Zhujiang said, "He Haihe second place, my third place. " He Haihe did not say anything. After the results were announced, they found that the predictions were only half right. Can be launched from the above, the correct position of the competition is:. ['He Haihe first, the Yellow River second, Zhang Zhujiang third, Li Changjiang fourth.', 'Section Yellow River first, He Haihe second, Li Changjiang third, Zhang Zhujiang fourth.', 'Li Changjiang first, Zhang Zhukou second, Duan Huanghe third, He Haihe fourth.', 'Zhang Zhujiang first, Li Changjiang second, He Haihe third, and Yellow river fourth.']