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为啥别人也这样的算法就ac了In Reply To:这样怎么也tle不能理解了 Posted by:first at 2006-04-02 21:51:46 > #include <iostream> > using namespace std; > > int k; > __int64 mod_sum(int n) > { > int d = k/n; > int t1 = n; > int t2 = k/(d + 1); > int s, e; > __int64 sum = 0; > while(t1 - t2 > 10) > { > s = k%t1; > e = k%(t2 + 1); > sum += __int64(s + e)*(t1 - t2)/2; > d ++; > t1 = t2; > t2 = k/(d + 1); > } > int i; > for(i = 2; i <= t1; i ++) > sum += k%i; > return sum; > } > int main() > { > int n; > scanf("%d %d", &n, &k); > __int64 sum = 0; > if(n == 1) > sum = 0; > else if(k == 1) > sum = n - 1; > else > { > if(n <= k) > sum = mod_sum(n); > else > { > sum = mod_sum(k); > sum += __int64(k)*(n - k); > } > } > printf("%I64d\n", sum); > return 0; > } Followed by:
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