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OI-codes/Luogu/P2678/P2678.cpp

38 lines
651 B
C++

#include <bits/stdc++.h>
using namespace std;
int n, m, l, r, mid, ans, a[50005];
bool check(int x) {
int now = 0, cnt = 0, i = 0;
for (int i = 1; i <= n; i++) {
if (a[i] - a[now] < x) {
cnt++;
} else {
now = i;
}
}
return cnt <= m;
}
int main() {
cin >> r >> n >> m;
for (int i = 1; i <= n; i++) {
cin >> a[i];
}
a[n + 1] = r;
l = 1;
while (l <= r) {
mid = l + r >> 1;
if (check(mid)) {
ans = mid;
l = mid + 1;
} else {
r = mid - 1;
}
}
cout << ans << endl;
return 0;
}