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Submission #745808

# Submission time Handle Problem Language Result Execution time Memory
745808 2023-05-21T08:06:59 Z vjudge1 Event Hopping (BOI22_events) C++17
0 / 100
 1080 ms 8152 KB 
#include <bits/stdc++.h>

using namespace std;
using ll = long long int;

const ll mod = 1e9 + 7;

int c[100100], hely[100100];

struct P
{
    int poz, id;
    bool veg;
};

bool cmp(P& lhs, P& rhs){
    if(lhs.poz != rhs.poz){
        return lhs.poz < rhs.poz;
    }
    return lhs.veg < rhs.veg;
}

int kov[100100] = {0}, be[100100] = {0};

int main(){
    int n, q;
    cin >> n >> q;
    vector<P> v;
    for(int i = 1; i <= n; ++i){
        int b, e;
        cin >> b >> e;
        v.push_back({b, i, false});
        v.push_back({e, i, true});
    }
    sort(begin(v), end(v), cmp);
    set<int> act;
    for(auto i : v){
        if(i.veg){
            act.erase(i.id);
            kov[i.id] = *act.begin();
            be[*act.begin()]++;
        }
        else{
            act.emplace(i.id);
        }
    }
    int ctr = 0;
    for(int i = 1; i <= n; ++i){
        if(be[i] == 0){
            ++ctr;
            int ptr = i, poz = 1;
            while(ptr != 0){
                c[ptr] = ctr;
                hely[ptr] = poz;
                ++poz;
                ptr = kov[ptr];
            }
        }
    }
    while(q--){
        int a, b;
        cin >> a >> b;
        if(c[a] != c[b] || hely[a] > hely[b]){
            cout << "impossible" << endl;
        }
        else{
            cout << hely[b] - hely[a] << endl;
        }
    }
    return 0;
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 292 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 292 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 292 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 278 ms 4896 KB Output is correct
2 Correct 271 ms 4912 KB Output is correct
3 Correct 290 ms 4908 KB Output is correct
4 Correct 290 ms 5012 KB Output is correct
5 Correct 276 ms 5276 KB Output is correct
6 Incorrect 1080 ms 8152 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -