oj.uz

Submission #237373

# Submission time Handle Problem Language Result Execution time Memory
237373 2020-06-06T09:23:48 Z uacoder123 Watching (JOI13_watching) C++14
100 / 100
 511 ms 16376 KB 
#include <bits/stdc++.h>
using namespace std;
#define F first
#define S second
#define FOR(i,a,b) for (auto i = (a); i <= (b); ++i)
#define NFOR(i,a,b) for(auto i = (a); i >= (b); --i)
#define all(x) (x).begin(), (x).end()
#define sz(x) int(x.size())
#define mp(i,a) make_pair(i,a)
#define pb(a) push_back(a)
#define bit(x,b) (x&(1LL<<b))

typedef long long int lli;
typedef pair <lli,lli> ii;
typedef pair <ii,lli> iii;
typedef vector <lli> vi;
lli s,l;
vi v;
int dp[2001][2001];
int cal(int p,int s1,int w)
{
    if(dp[p][s1]!=-1)
        return(dp[p][s1]);
    if(p==v.size())
        return(0);
    int i1=p,i2;
    while(i1<v.size()&&v[i1]<w+v[p])
        i1++;
    i2=i1;
    while(i2<v.size()&&v[i2]<2*w+v[p])
        i2++;
    if(s1>0)
        dp[p][s1]=min(cal(i1,s1-1,w),1+cal(i2,s1,w));
    else
        dp[p][s1]=1+cal(i2,s1,w);
    return(dp[p][s1]);
}
lli check(lli w)
{
    memset(dp,-1,sizeof(dp));
    return((cal(0,s,w)<=l)?1:0);
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    lli test=1;
    for(;test>0;--test)
    {
        lli n,f,ans=1000000000,le=1,ri=1000000002;
        cin>>n>>s>>l;
        for(lli i=0;i<n;++i)
        {
            cin>>f;
            v.pb(f);
        }
        sort(all(v));
        if(s+l>=n)
        {
            cout<<1<<endl;
            exit(0);
        }
        while(le<=ri)
        {
            lli m=(le+ri)/2;
            if(check(m))
            {
                ans=m;
                ri=m-1;
            }
            else
                le=m+1;
        }
        cout<<ans<<endl;
    }
    return(0);
}

Compilation message

watching.cpp: In function 'int cal(int, int, int)':
watching.cpp:24:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(p==v.size())
        ~^~~~~~~~~~
watching.cpp:27:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while(i1<v.size()&&v[i1]<w+v[p])
           ~~^~~~~~~~~
watching.cpp:30:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while(i2<v.size()&&v[i2]<2*w+v[p])
           ~~^~~~~~~~~

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 68 ms 16000 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Correct 67 ms 16000 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 4 ms 384 KB Output is correct
7 Correct 69 ms 16000 KB Output is correct
8 Correct 66 ms 16000 KB Output is correct
9 Correct 69 ms 16000 KB Output is correct
10 Correct 68 ms 16000 KB Output is correct
11 Correct 69 ms 16000 KB Output is correct
12 Correct 70 ms 16000 KB Output is correct
13 Correct 68 ms 16120 KB Output is correct
14 Correct 67 ms 16000 KB Output is correct
15 Correct 67 ms 16000 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 71 ms 16120 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 72 ms 16000 KB Output is correct
8 Correct 115 ms 16120 KB Output is correct
9 Correct 248 ms 16248 KB Output is correct
10 Correct 511 ms 16248 KB Output is correct
11 Correct 108 ms 16120 KB Output is correct
12 Correct 356 ms 16376 KB Output is correct
13 Correct 69 ms 16000 KB Output is correct
14 Correct 69 ms 16000 KB Output is correct
15 Correct 69 ms 16000 KB Output is correct