#include<bits/stdc++.h>
using namespace std;
int n,p,q,a,st,md,ed,dp[2005][2005],val,idx,st1,st2,type;
vector<int> small[2005],large[2005],v;
int main()
{
scanf("%d%d%d",&n,&p,&q);
for(int i=1;i<=n;i++)
{
scanf("%d",&a);
v.push_back(a);
}
sort(v.begin(),v.end());
st=1;
ed=1e9;
while(ed>=st)
{
md=(st+ed)/2;
//printf("%d %d %d\n",st,md,ed);
for(int i=0;i<n;i++)
{
for(int j=0;j<n;j++)
{
dp[i][j]=1e9;
}
}
md=(st+ed)/2;
for(int i=0;i<v.size()-1;i++)
{
val=v[i+1]+md-1;
idx=upper_bound(v.begin(),v.end(),val)-v.begin()-1;
//printf("%d %d\n",i,idx);
small[idx].push_back(i);
}
//printf("\n");
for(int i=0;i<v.size()-1;i++)
{
val=v[i+1]+2*md-1;
idx=upper_bound(v.begin(),v.end(),val)-v.begin()-1;
//printf("%d %d\n",i,idx);
large[idx].push_back(i);
}
//printf("\n");
st1=upper_bound(v.begin(),v.end(),v[0]+md-1)-v.begin()-1;
st2=upper_bound(v.begin(),v.end(),v[0]+2*md-1)-v.begin()-1;
//printf("%d %d\n",st1,st2);
dp[st1][1]=min(dp[st1][1],0);
dp[st2][0]=min(dp[st2][0],1);
for(int i=1;i<n;i++)
{
for(int j=0;j<n;j++)
{
for(int k=0;k<small[i].size();k++)
{
if(j>0)
{
dp[i][j]=min(dp[i][j],dp[small[i][k]][j-1]);
}
}
for(int k=0;k<large[i].size();k++)
{
dp[i][j]=min(dp[i][j],dp[large[i][k]][j]+1);
}
}
}
type=-1;
for(int i=0;i<=p;i++)
{
if(dp[n-1][i]<=q)
{
type=0;
}
}
if(type==0)
{
ed=md-1;
}else
{
st=md+1;
}
for(int i=0;i<n;i++)
{
small[i].clear();
large[i].clear();
}
}
//printf("%d %d %d\n",st,md,ed);
printf("%d\n",st);
}
Compilation message
watching.cpp: In function 'int main()':
watching.cpp:28:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
28 | for(int i=0;i<v.size()-1;i++)
| ~^~~~~~~~~~~
watching.cpp:36:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
36 | for(int i=0;i<v.size()-1;i++)
| ~^~~~~~~~~~~
watching.cpp:53:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
53 | for(int k=0;k<small[i].size();k++)
| ~^~~~~~~~~~~~~~~~
watching.cpp:60:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
60 | for(int k=0;k<large[i].size();k++)
| ~^~~~~~~~~~~~~~~~
watching.cpp:7:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
7 | scanf("%d%d%d",&n,&p,&q);
| ~~~~~^~~~~~~~~~~~~~~~~~~
watching.cpp:10:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
10 | scanf("%d",&a);
| ~~~~~^~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
716 KB |
Output is correct |
| 2 |
Correct |
0 ms |
332 KB |
Output is correct |
| 3 |
Correct |
1 ms |
384 KB |
Output is correct |
| 4 |
Correct |
5 ms |
844 KB |
Output is correct |
| 5 |
Correct |
2 ms |
716 KB |
Output is correct |
| 6 |
Correct |
4 ms |
716 KB |
Output is correct |
| 7 |
Correct |
2 ms |
716 KB |
Output is correct |
| 8 |
Correct |
2 ms |
844 KB |
Output is correct |
| 9 |
Correct |
2 ms |
716 KB |
Output is correct |
| 10 |
Correct |
2 ms |
844 KB |
Output is correct |
| 11 |
Correct |
2 ms |
716 KB |
Output is correct |
| 12 |
Correct |
2 ms |
844 KB |
Output is correct |
| 13 |
Correct |
4 ms |
844 KB |
Output is correct |
| 14 |
Correct |
2 ms |
776 KB |
Output is correct |
| 15 |
Correct |
2 ms |
948 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
890 ms |
16260 KB |
Output is correct |
| 2 |
Correct |
2 ms |
384 KB |
Output is correct |
| 3 |
Correct |
633 ms |
16312 KB |
Output is correct |
| 4 |
Runtime error |
80 ms |
32500 KB |
Execution killed with signal 11 |
| 5 |
Halted |
0 ms |
0 KB |
- |
