oj.uz

Submission #656553

# Submission time Handle Problem Language Result Execution time Memory
656553 2022-11-08T00:43:31 Z Lobo Event Hopping (BOI22_events) C++17
25 / 100
 1500 ms 6936 KB 
#include<bits/stdc++.h>
using namespace std;
const long long inf = (long long) 1e18 + 10;
const int inf1 = (int) 1e9 + 10;
#define int long long
#define dbl long double
#define endl '\n'
#define sc second
#define fr first
#define mp make_pair
#define pb push_back
#define all(x) x.begin(), x.end()

const int maxn = 1e5+10;

int n, q, idord[maxn], lf[maxn], rg[maxn], nx[maxn][25], pv[maxn][25];

void solve() {
    cin >> n >> q;
    vector<pair<pair<int,int>,int>> ord;
    vector<int> cc;
    for(int i = 1; i <= n; i++) {
        int l, r; cin >> l >> r;
        ord.pb(mp(mp(r,l),i));
        lf[i] = l;
        rg[i] = r;
        cc.pb(lf[i]);
        cc.pb(rg[i]);
    }
    sort(all(cc));
    cc.erase(unique(all(cc)),cc.end());
    for(int i = 1; i <= n; i++) {
        lf[i] = upper_bound(all(cc),lf[i])-cc.begin();
        rg[i] = upper_bound(all(cc),rg[i])-cc.begin();
    }
    // sort(all(ord));

    for(int i = 1; i <= n; i++) {
        nx[i][0] = 0;
        for(int j = 1; j <= n; j++) {
            if(j == i || !(lf[j] <= rg[i] && rg[i] <= rg[j]) || !(rg[j] > rg[i])) continue;
            if(nx[i][0] == 0 || rg[j] > rg[nx[i][0]]) nx[i][0] = j;
        }
        pv[i][0] = 0;
        for(int j = 1; j <= n; j++) {
            if(j == i || !(lf[i] <= rg[j] && rg[j] <= rg[i]) || !(lf[j] < lf[i])) continue;
            if(pv[i][0] == 0 || lf[j] < lf[pv[i][0]]) pv[i][0] = j;
        }
        // int l = i+1;
        // int r = n;
        // while(l <= r) {
        //     int mid = (l+r)/2;
        //     if(lf[mid] <= rg[i]) {
        //         nx[i][0] = mid;
        //         l = mid+1;
        //     }
        //     else {
        //         r = mid-1;
        //     }
        // }

        // cout << i << " " << nx[i][0] << " " << pv[i][0] << endl;
    }

    for(int j = 1; j <= 20; j++) {
        for(int i = 1; i <= n; i++) {
            nx[i][j] = nx[nx[i][j-1]][j-1];
            pv[i][j] = pv[pv[i][j-1]][j-1];
        }
    }

    while(q--) {
        int s,e; cin >> s >> e;

        int ans = 0;
        for(int j = 20; j >= 0; j--) {
            if(nx[s][j] != 0 && rg[nx[s][j]] < rg[e]) {
                ans+= (1<<j);
                s = nx[s][j];
            }
        }
        for(int j = 20; j >= 0; j--) {
            if(pv[e][j] != 0 && lf[pv[e][j]] > lf[s]) {
                ans+= (1<<j);
                e = pv[e][j];
            }
        }
        if(s == e) {
            cout << ans << endl;
        }
        else if(lf[e] <= rg[s] && rg[s] <= rg[e]) {
            cout << ans+1 << endl;
        }
        else if(nx[s][0] != 0 && lf[e] <= rg[nx[s][0]] && rg[nx[s][0]] <= rg[e]) {
            cout << ans+2 << endl;
        }
        else if(pv[e][0] != 0 && lf[pv[e][0]] <= rg[s] && rg[s] <= rg[pv[e][0]]) {
            cout << ans+2 << endl;
        }
        else {
            cout << "impossible" << endl;
        }
    }
}

int32_t main() {
    ios::sync_with_stdio(false); cin.tie(0);

    // freopen("in.in", "r", stdin);
    // freopen("out.out", "w", stdout);
    int tt = 1;
    // cin >> tt;
    while(tt--) {
        solve();
    }

}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Execution timed out 1591 ms 6936 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 8 ms 724 KB Output is correct
4 Correct 8 ms 724 KB Output is correct
5 Correct 8 ms 724 KB Output is correct
6 Correct 9 ms 700 KB Output is correct
7 Correct 11 ms 748 KB Output is correct
8 Correct 9 ms 724 KB Output is correct
9 Correct 3 ms 724 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 8 ms 724 KB Output is correct
4 Correct 8 ms 724 KB Output is correct
5 Correct 8 ms 724 KB Output is correct
6 Correct 9 ms 700 KB Output is correct
7 Correct 11 ms 748 KB Output is correct
8 Correct 9 ms 724 KB Output is correct
9 Correct 3 ms 724 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 7 ms 724 KB Output is correct
13 Correct 9 ms 820 KB Output is correct
14 Correct 8 ms 728 KB Output is correct
15 Correct 9 ms 704 KB Output is correct
16 Correct 12 ms 808 KB Output is correct
17 Correct 8 ms 724 KB Output is correct
18 Correct 3 ms 724 KB Output is correct
19 Correct 260 ms 3148 KB Output is correct
20 Correct 223 ms 3212 KB Output is correct
21 Correct 251 ms 3504 KB Output is correct
22 Correct 271 ms 3632 KB Output is correct
23 Correct 328 ms 3452 KB Output is correct
24 Correct 245 ms 3416 KB Output is correct
25 Correct 220 ms 3012 KB Output is correct

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 8 ms 724 KB Output is correct
4 Correct 8 ms 724 KB Output is correct
5 Correct 8 ms 724 KB Output is correct
6 Correct 9 ms 700 KB Output is correct
7 Correct 11 ms 748 KB Output is correct
8 Correct 9 ms 724 KB Output is correct
9 Correct 3 ms 724 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 8 ms 724 KB Output is correct
13 Correct 9 ms 744 KB Output is correct
14 Correct 7 ms 724 KB Output is correct
15 Correct 10 ms 724 KB Output is correct
16 Correct 11 ms 804 KB Output is correct
17 Correct 9 ms 720 KB Output is correct
18 Correct 5 ms 724 KB Output is correct
19 Execution timed out 1586 ms 6708 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1558 ms 6724 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Execution timed out 1591 ms 6936 KB Time limit exceeded
3 Halted 0 ms 0 KB -