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我晕...难度用double不是这样做的? 但是double的精度不行..连sample3都过不了啊
i = 2;
t = 1;
ans = 0.0;
while (i < strlen(a))
{
ans += double(a[i] - 48) / (pow(8.0, double(t)));
i++;
t++;
}
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