39 lines
1.1 KiB
C++
39 lines
1.1 KiB
C++
#include <algorithm>
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#include <iostream>
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#include <vector>
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typedef std::vector<int>::iterator VECINT_ITER;
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int Josephus(int n, int k)
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{
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static std::vector<int> vecJosephus(1, 0);
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if (n <= (int)vecJosephus.size())
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return vecJosephus[n - 1];
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int j = (Josephus(n - 1, k) + k) % n;
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vecJosephus.push_back(j);
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return j;
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}
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int main(void)
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{
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for (int i = 0; i < 100000; Josephus(++i, 15));
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for (int nSizeMin, nSizeMax; std::cin >> nSizeMin >> nSizeMax;)
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{
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if (nSizeMin > nSizeMax)
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std::swap(nSizeMin, nSizeMax);
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if (nSizeMin == 0 && nSizeMax == 0)
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break;
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std::vector<int> vecCover(nSizeMin / 2, 0);
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for (int nSize = nSizeMin, nJump = 15; nSize <= nSizeMax; ++nSize) {
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int j = Josephus(nSize, nJump);
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if (j > nSize / 2)
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j = nSize - j;
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if (j < vecCover.size())
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vecCover[j] = 1;
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}
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VECINT_ITER ir = std::find(vecCover.begin() + 1, vecCover.end(), 0);
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if (ir == vecCover.end())
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std::cout << "Better estimate needed" << std::endl;
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else
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std::cout << ir - vecCover.begin() << std::endl;
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}
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return 0;
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}
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