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要及时返回 到最后一层 不论能不能 更新ans 都要 return 别跟我一样 .... 傻乎乎的 往下搜应该是这样的
if (depth == 0)
{
if (leftv == 0 && nows < ans)
ans = nows;
return;
}
而不是 这样的
if (depth == 0 && leftv == 0 && nows < ans))
{
ans = nows;
return;
}
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