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提醒下WA的同学。在机器和机器建边的时候,要这样写。
for(int l = 1; l <= n; ++l){ // 外层循环扫到 i -> l
if(i == l) continue;
WA了一页因为写成这样。
for(int l = i + 1; l <= n; ++l){ // 外层循环扫到 i -> l
啥也不说了,先等我哭够。
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