oj.uz

Submission #1103608

# Submission time Handle Problem Language Result Execution time Memory
1103608 2024-10-21T11:45:55 Z 12345678 Fire (BOI24_fire) C++17
0 / 100
 2000 ms 12964 KB 
#include <bits/stdc++.h>

using namespace std;

#define ll long long

const int nx=2e5+5;

ll n, m, nxt[nx], inv[nx], vs[nx], ans=-1, cnt;
pair<ll, ll> vl[nx];
vector<ll> d[nx];

bool dfs(int u)
{
    int in=0;
    vs[u]=1;
    for (auto v:d[u])
    {
        if (vs[v]==2) continue;
        if (vs[v]==1) return cnt++, vs[u]=vs[v]=2, 1;
        in=in||dfs(v);
    }
    if (vs[u]==2) return cnt++, 0;
    vs[u]=2;
    if (in) return cnt++, 1;
    return 0;
}

ll compare(int x, int y)
{
    pair<ll, ll> px=vl[x], py=vl[y];
    if (inv[x]) px.second+=m, py.first+=m, py.second+=m;
    if (inv[y]) py.second+=m;
    if (px.first<=py.first&&py.first<=px.second&&py.second>px.second) return py.second;
    return -1;
}

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>m;
    for (int i=1; i<=n; i++) cin>>vl[i].first>>vl[i].second, inv[i]=vl[i].second<vl[i].first;
    for (int i=1; i<=n; i++)
    {
        pair<int, int> mx={-1, -1};
        for (int j=1; j<=n; j++) mx=max(mx, {compare(i, j), j});
        if (mx.first!=-1) d[i].push_back(mx.second);
        //cout<<"debug "<<i<<' '<<mx.second<<'\n';
    }
    for (int i=1; i<=n; i++) if (!vs[i]) cnt=0, dfs(i), ans=max(ans, cnt?cnt:-1);
    cout<<ans;
}

Subtask #1
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8784 KB Output is correct
2 Correct 2 ms 8784 KB Output is correct
3 Correct 2 ms 8784 KB Output is correct
4 Correct 2 ms 8784 KB Output is correct
5 Correct 2 ms 8784 KB Output is correct
6 Correct 2 ms 8784 KB Output is correct
7 Correct 2 ms 8784 KB Output is correct
8 Correct 2 ms 8784 KB Output is correct
9 Incorrect 2 ms 8784 KB Output isn't correct
10 Halted 0 ms 0 KB -

Subtask #2
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8784 KB Output is correct
2 Correct 2 ms 8784 KB Output is correct
3 Correct 2 ms 8784 KB Output is correct
4 Correct 2 ms 8784 KB Output is correct
5 Correct 2 ms 8784 KB Output is correct
6 Correct 2 ms 8784 KB Output is correct
7 Correct 2 ms 8784 KB Output is correct
8 Correct 2 ms 8784 KB Output is correct
9 Incorrect 2 ms 8784 KB Output isn't correct
10 Halted 0 ms 0 KB -

Subtask #3
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8784 KB Output is correct
2 Correct 2 ms 8784 KB Output is correct
3 Correct 2 ms 8784 KB Output is correct
4 Correct 2 ms 8784 KB Output is correct
5 Correct 2 ms 8784 KB Output is correct
6 Correct 2 ms 8784 KB Output is correct
7 Correct 2 ms 8784 KB Output is correct
8 Correct 2 ms 8784 KB Output is correct
9 Incorrect 2 ms 8784 KB Output isn't correct
10 Halted 0 ms 0 KB -

Subtask #4
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8784 KB Output is correct
2 Correct 2 ms 8784 KB Output is correct
3 Correct 2 ms 8952 KB Output is correct
4 Correct 2 ms 8784 KB Output is correct
5 Correct 2 ms 8784 KB Output is correct
6 Correct 2 ms 8784 KB Output is correct
7 Correct 2 ms 8784 KB Output is correct
8 Correct 2 ms 8784 KB Output is correct
9 Correct 2 ms 8784 KB Output is correct
10 Correct 2 ms 8784 KB Output is correct
11 Correct 2 ms 8960 KB Output is correct
12 Correct 2 ms 8784 KB Output is correct
13 Correct 2 ms 8784 KB Output is correct
14 Correct 2 ms 8784 KB Output is correct
15 Correct 97 ms 8888 KB Output is correct
16 Correct 104 ms 9032 KB Output is correct
17 Correct 172 ms 9028 KB Output is correct
18 Correct 90 ms 9208 KB Output is correct
19 Correct 86 ms 8784 KB Output is correct
20 Execution timed out 2068 ms 12964 KB Time limit exceeded
21 Halted 0 ms 0 KB -

Subtask #5
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8784 KB Output is correct
2 Correct 2 ms 8784 KB Output is correct
3 Correct 2 ms 8784 KB Output is correct
4 Incorrect 2 ms 8784 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #6
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8784 KB Output is correct
2 Correct 2 ms 8784 KB Output is correct
3 Correct 2 ms 8784 KB Output is correct
4 Correct 2 ms 8784 KB Output is correct
5 Correct 2 ms 8784 KB Output is correct
6 Correct 2 ms 8784 KB Output is correct
7 Correct 2 ms 8784 KB Output is correct
8 Correct 2 ms 8784 KB Output is correct
9 Incorrect 2 ms 8784 KB Output isn't correct
10 Halted 0 ms 0 KB -