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21 lines
461 B
C++
21 lines
461 B
C++
#include <bits/stdc++.h>
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using namespace std;
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typedef long long ll;
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const int N = 1e5 + 50;
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int a[N];
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int main()
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{
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int n, m;
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ll ans = 0;
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scanf("%d%d", &n, &m);
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for (int i = 0; i < m; i++)
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scanf("%d", a + i);
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sort(a, a + m);
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for (int i = 1; i < m; i++)
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a[i - 1] = a[i] - a[i - 1];
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sort(a, a + m - 1, greater<int>());
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for (int i = n - 1; i < m - 1; i++)
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ans += a[i];
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printf("%lld", ans);
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return 0;
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} |