# |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
797856 |
2023-07-30T03:21:19 Z |
OrazB |
Watching (JOI13_watching) |
C++14 |
|
145 ms |
2644 KB |
#include <bits/stdc++.h>
using namespace std;
#define all(x) (x).begin(), (x).end()
const int N = 2e3+5;
int a[N];
int main ()
{
ios::sync_with_stdio(false);
cin.tie(0);
int n, p, q;
cin >> n >> p >> q;
for (int i = 1; i <= n; i++) cin >> a[i];
sort(a+1,a+n+1);
if (p+q >= n) return cout << 1, 0;
int l = 1, r = 1e9, ans = -1;
while(l <= r){
int md = (l+r)>>1;
vector<vector<int>> dp(n+1, vector<int>(min(p+1,q+1), 1e9));
for (int i = 0; i <= p; i++) dp[0][i] = 0;
for (int i = 1; i <= n; i++){
for (int j = 0; j <= min(p,q); j++){
int x = 1, y = i, pos1;
while(x <= y){
int mid = (x+y)>>1;
if (a[mid] > a[i]-md){
pos1 = mid;
y = mid - 1;
}else x = mid + 1;
}
x = 1, y = i;
int pos2;
while(x <= y){
int mid = (x+y)>>1;
if (a[mid] > a[i]-2*md){
pos2 = mid;
y = mid - 1;
}else x = mid + 1;
}
if (p <= q){
if (j) dp[i][j] = min(dp[i][j], dp[pos1-1][j-1]);
dp[i][j] = min(dp[i][j], dp[pos2-1][j]+1);
}else{
if (j) dp[i][j] = min(dp[i][j], dp[pos2-1][j-1]);
dp[i][j] = min(dp[i][j], dp[pos1-1][j]+1);
}
}
}
if (*min_element(all(dp[n])) <= max(p,q)){
ans = md;
r = md - 1;
}else l = md + 1;
}
cout << ans;
}
Compilation message
watching.cpp: In function 'int main()':
watching.cpp:43:38: warning: 'pos2' may be used uninitialized in this function [-Wmaybe-uninitialized]
43 | dp[i][j] = min(dp[i][j], dp[pos2-1][j]+1);
| ~~~~^~
watching.cpp:42:45: warning: 'pos1' may be used uninitialized in this function [-Wmaybe-uninitialized]
42 | if (j) dp[i][j] = min(dp[i][j], dp[pos1-1][j-1]);
| ~~~~^~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
212 KB |
Output is correct |
2 |
Correct |
0 ms |
212 KB |
Output is correct |
3 |
Correct |
0 ms |
212 KB |
Output is correct |
4 |
Correct |
1 ms |
212 KB |
Output is correct |
5 |
Correct |
0 ms |
212 KB |
Output is correct |
6 |
Correct |
1 ms |
212 KB |
Output is correct |
7 |
Correct |
1 ms |
212 KB |
Output is correct |
8 |
Correct |
1 ms |
212 KB |
Output is correct |
9 |
Runtime error |
1 ms |
468 KB |
Execution killed with signal 6 |
10 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
7 ms |
440 KB |
Output is correct |
2 |
Correct |
0 ms |
212 KB |
Output is correct |
3 |
Correct |
1 ms |
212 KB |
Output is correct |
4 |
Correct |
1 ms |
212 KB |
Output is correct |
5 |
Correct |
1 ms |
212 KB |
Output is correct |
6 |
Correct |
1 ms |
212 KB |
Output is correct |
7 |
Correct |
30 ms |
468 KB |
Output is correct |
8 |
Correct |
145 ms |
1372 KB |
Output is correct |
9 |
Runtime error |
6 ms |
2644 KB |
Execution killed with signal 6 |
10 |
Halted |
0 ms |
0 KB |
- |