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14 lines
342 B
C++
14 lines
342 B
C++
#include <cstdio>
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long long n, k, ans;
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int main()
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{
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scanf("%lld%lld", &n, &k);
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long long sz = n < k ? n : k;
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for (long long i = 1, last, t; i <= sz; i = last + 1)
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{
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t = k / i, last = k / t;
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if (last >= n) last = n;
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ans -= ((last - i + 1) * (i + last) >> 1) * t;
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}
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printf("%lld", ans + n * k);
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} |