Section 7.1.1
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#include <cstdio>
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#include <algorithm>
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int n, m, a[100005];
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bool check(int d)
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{
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int cow = 0, nxt = 0;
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for (int i = 0; i < n; i++)
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if (a[i] >= nxt)
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cow++, nxt = a[i] + d;
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return cow >= m;
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}
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int main()
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{
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scanf("%d%d", &n, &m);
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for (int i = 0; i < n; i++) scanf("%d", a + i);
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std::sort(a, a + n);
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int L = 0, R = 0x3f3f3f3f, mid;
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while (L < R)
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check(mid = (L + R) >> 1) ? L = mid + 1 : R = mid;
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printf("%d", L - 1);
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return 0;
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}
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#include <cstdio>
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#include <algorithm>
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int n, m, a[100005];
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bool check(int d)
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{
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int cow = 0, nxt = 0;
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for (int i = 0; i < n; i++)
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if (a[i] >= nxt)
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cow++, nxt = a[i] + d;
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return cow >= m;
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}
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int main()
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{
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scanf("%d%d", &n, &m);
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for (int i = 0; i < n; i++) scanf("%d", a + i);
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std::sort(a, a + n);
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int L = 0, R = 0x3f3f3f3f, mid;
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while (L < R)
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check(mid = (L + R) >> 1) ? L = mid + 1 : R = mid;
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printf("%d", L - 1);
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return 0;
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}
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