This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define f0(i, n) for(int i(0); i<(n); i++)
#define f1(i, n) for(int i(1); i<=(n); i++)
using namespace std;
typedef long long ll;
const int N = 2002;
typedef pair <int, int> pii;
int n, p, q, a[N];
ostream& operator << (ostream &os, pii yu){
cout << yu.first << " " << yu.second;
}
istream& operator >> (istream &is, pii &yu){
cin >> yu.first >> yu.second;
}
int f[N][N];
bool check(int mid){
memset(f, -1, sizeof(f));
f0(j, q + 1) f[0][j] = p;
f1(i, n){
f0(j, q + 1){
if(j == 0){
int k = lower_bound(a + 1, a + n + 1, a[i] - mid + 1) - a; --k;
/// k + 1 -> i
if(f[k][j] > 0){
f[i][j] = f[k][j] - 1;
}
}
else{
int k = lower_bound(a + 1, a + n + 1, a[i] - mid + 1) - a; --k;
/// k + 1 -> i
if(f[k][j] > 0){
f[i][j] = f[k][j] - 1;
}
k = lower_bound(a + 1, a + n + 1, a[i] - 2*mid + 1) - a; --k;
f[i][j] = max(f[i][j], f[k][j - 1]);
}
}
}
return (f[n][q] >= 0);
}
int main(){
ios_base::sync_with_stdio(0);
cin >> n >> p >> q;
f1(i, n) cin >> a[i];
sort(a + 1, a + n + 1);
if(p + q >= n){
cout << 1; return 0;
}
int l = 1, r = 1e9 + 2, ans = -1;
while(l <= r){
int mid = (l + r)/2;
if(check(mid)) ans = mid, r = mid - 1;
else l = mid + 1;
}
cout << ans;
}
Compilation message (stderr)
watching.cpp: In function 'std::ostream& operator<<(std::ostream&, pii)':
watching.cpp:14:1: warning: no return statement in function returning non-void [-Wreturn-type]
}
^
watching.cpp: In function 'std::istream& operator>>(std::istream&, pii&)':
watching.cpp:18:1: warning: no return statement in function returning non-void [-Wreturn-type]
}
^
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