oj.uz

Submission #888991

# Submission time Handle Problem Language Result Execution time Memory
888991 2023-12-18T14:36:34 Z ducngo Passport (JOI23_passport) C++17
6 / 100
 31 ms 8668 KB 
#include <bits/stdc++.h>
#define getbit(i, j) ((i >> j) & 1)
#define maxn 200005
#define name "Passport"
using namespace std;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

long long GetRandom(long long l, long long r)
{
    return uniform_int_distribution<long long> (l, r)(rng);
}

int n,q,r[maxn];
int dpl[2505][2505],dpr[2505][2505];
pair<int,int> a[maxn];
int f[2505][2505],xd[2505][2505];

int tinh(int d,int c)
{
    if(d>c) return 1e9;
    if(d==1&&c==n) return 0;
    if(xd[d][c]==1) return f[d][c];

    xd[d][c]=1;
    int val=1e9;
    int u=dpl[d][c];
    val=min(val,tinh(u,c)+1);
    u=dpr[d][c];
    val=min(val,tinh(d,u)+1);
    val=min({val,tinh(d+1,c),tinh(d,c-1)});
    if(d==c) val=min(val,tinh(a[d].first,a[d].second)+1);
    f[d][c]=val;
    return f[d][c];
}

void sub1()
{
    int vt=1,sl=0;
    while(vt<n)
    {
        int luu=vt;
//        cout<<vt<<' '<<dpr[1][vt]<<'\n';
        vt=r[vt];
        sl++;
        if(luu==vt) break;
    }
    if(vt!=n) cout<<-1<<'\n';
    else cout<<sl<<'\n';
    exit(0);
}

void sub()
{
    r[1]=a[1].second;
    for(int i=2;i<=n;i++) r[i]=max(r[i-1],a[i].second);
    int x;
    cin >> x;
    sub1();
    exit(0);
}

void sub3()
{
    for(int i=1;i<=n;i++)
    {
        dpl[i][i]=a[i].first;
        dpr[i][i]=a[i].second;
        for(int j=i+1;j<=n;j++)
        {
            dpl[i][j]=min(dpl[i][j-1],a[j].first);
            dpr[i][j]=max(dpr[i][j-1],a[j].second);
        }
    }

    r[1]=a[1].second;
    for(int i=2;i<=n;i++) r[i]=max(r[i-1],a[i].second);

    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=n;j++) f[i][j]=1e9;
    }

    for(int i=1;i<=q;i++)
    {
        int x;
        cin >> x;
        if(q==1&&x==1) sub1();
        int val=tinh(x,x);
        if(val>n) cout<<-1<<'\n';
        else cout<<val<<'\n';
    }
    exit(0);
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    if(fopen(name".inp","r"))
    {
        freopen(name".inp","r",stdin);
        freopen(name".out","w",stdout);
    }
    cin >> n;
    for(int i=1;i<=n;i++)
    {
        cin >> a[i].first >> a[i].second;
    }
    cin >> q;
    if(n>2500&&q==1) sub();
    if(n<=2500)sub3();
}

Compilation message

passport.cpp: In function 'int main()':
passport.cpp:103:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  103 |         freopen(name".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
passport.cpp:104:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  104 |         freopen(name".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8540 KB Output is correct
2 Correct 1 ms 8540 KB Output is correct
3 Correct 1 ms 8540 KB Output is correct
4 Correct 25 ms 5340 KB Output is correct
5 Correct 23 ms 5204 KB Output is correct
6 Correct 23 ms 5200 KB Output is correct
7 Correct 31 ms 5212 KB Output is correct
8 Correct 27 ms 4948 KB Output is correct

Subtask #2
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8540 KB Output is correct
2 Correct 1 ms 8668 KB Output is correct
3 Correct 1 ms 8540 KB Output is correct
4 Correct 1 ms 8540 KB Output is correct
5 Correct 2 ms 8540 KB Output is correct
6 Correct 1 ms 8540 KB Output is correct
7 Incorrect 1 ms 8536 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #3
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8540 KB Output is correct
2 Correct 1 ms 8668 KB Output is correct
3 Correct 1 ms 8540 KB Output is correct
4 Correct 1 ms 8540 KB Output is correct
5 Correct 2 ms 8540 KB Output is correct
6 Correct 1 ms 8540 KB Output is correct
7 Incorrect 1 ms 8536 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #4
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8540 KB Output is correct
2 Correct 1 ms 8668 KB Output is correct
3 Correct 1 ms 8540 KB Output is correct
4 Correct 1 ms 8540 KB Output is correct
5 Correct 2 ms 8540 KB Output is correct
6 Correct 1 ms 8540 KB Output is correct
7 Incorrect 1 ms 8536 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #5
0 / 46.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8540 KB Output is correct
2 Correct 1 ms 8540 KB Output is correct
3 Correct 1 ms 8540 KB Output is correct
4 Correct 25 ms 5340 KB Output is correct
5 Correct 23 ms 5204 KB Output is correct
6 Correct 23 ms 5200 KB Output is correct
7 Correct 31 ms 5212 KB Output is correct
8 Correct 27 ms 4948 KB Output is correct
9 Correct 2 ms 8540 KB Output is correct
10 Correct 1 ms 8668 KB Output is correct
11 Correct 1 ms 8540 KB Output is correct
12 Correct 1 ms 8540 KB Output is correct
13 Correct 2 ms 8540 KB Output is correct
14 Correct 1 ms 8540 KB Output is correct
15 Incorrect 1 ms 8536 KB Output isn't correct
16 Halted 0 ms 0 KB -