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"No, the whole waist is broken and people are divided into two parts from the middle." Wang Zeduan said.退一步说，他们最会避敌锋芒，主力往哪个方向追，他们便朝哪个方向退，同时四散包围，一旦他们觉得合适了，就会出击。D > B enters the synchronized block, and since instance is not null at this time, it immediately leaves the synchronized block and returns the result to the program calling the method. E > At this point, thread B intends to use the Singleton instance, only to find that it has not been initialized, so an error occurs. Therefore, there is still the possibility of errors in the program. In fact, the running process of the program is very complicated. From this, we can see that it is more difficult and challenging to write programs especially in multi-threaded environment. We further optimized the program:《神枪游侠》讲诉的是在英国殖民时期的1759年，罗杰斯奉命率领骑兵队深入西北边陲地带，扫荡由法军撑腰的印第安人，不料功亏一簧，被他们从地图上没有的路线逃跑了。在骑兵队追踪的过程中，遇到印第安向导叛变及部队携带的火药爆炸等意外，又有高山大河等天险，但罗杰斯始终不放弃任务，直到打通前往太平洋的西北通道。It is divided into two groups AB. Group A has three signatures A1, A2 and A3. If A3 is drawn, it will be empty and will advance directly to the next match. If A1A2 is drawn for the match, the winner will compete with A3 for a total of 2 matches, and the first and second place in Group A will be obtained.