oj.uz

Submission #777284

# Submission time Handle Problem Language Result Execution time Memory
777284 2023-07-09T01:43:44 Z Cookie Event Hopping (BOI22_events) C++14
45 / 100
 174 ms 39252 KB 
#include<bits/stdc++.h>
#include<fstream>
using namespace std;
ifstream fin("WINTER.inp");
ofstream fout("WINTER.out");
#define sz(v) (int)v.size()
#define ll long long
#define pb push_back
#define forr(i, a, b) for(int i = a; i < b; i++)
#define dorr(i, a, b) for(int i = a; i >= b; i--)
#define ld long double
#define vt vector
#include<fstream>
#define fi first
#define se second
#define pll pair<ll, ll>
#define pii pair<int, int>
const ld PI = 3.14159265359;
const int x[4] = {1, -1, 0, 0};
const int y[4] = {0, 0, 1, -1};
const ll mod = 1e9 + 7;
const int mxn = 2e5 + 5, mxm = 1e5, sq = 400;
const int base = (1 << 18);
const ll inf = 1e9;
const ld pre = 1e-6;
struct th{
    int s, e, id;
    bool operator <(const th &b){
        return(s < b.s);
    }
};
int n, q;
vt<int>comp;
int find(int x){
    return(lower_bound(comp.begin(), comp.end(), x) - comp.begin());
}
pii up[mxn + 1][17];
int pref[mxn + 1][17], s[mxn + 1], e[mxn + 1];
pii get(int l, int r){
    int lg = __lg(r - l + 1);
    return(min(up[l][lg], up[r - (1 << lg) + 1][lg]));
}
signed main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> n >> q;
    for(int i = 1; i <= n; i++){
        cin >> s[i] >> e[i];
        comp.pb(s[i]); comp.pb(e[i]); 
    }
    sort(comp.begin(), comp.end());
    for(int i = 0; i < sz(comp); i++){
        up[i][0] = make_pair(inf, 0);
    }
    for(int i = 1; i <= n; i++){
        up[find(e[i])][0] = min(up[find(e[i])][0], make_pair(s[i], i));
    }
    for(int i = 1; i < 17; i++){
        for(int j = 0; j + (1 << i) - 1 < sz(comp); j++){
            up[j][i] = min(up[j][i - 1], up[j + (1 << (i - 1))][i - 1]);
        }
    }
    for(int i = 1; i <= n; i++){
        pref[i][0] = get(find(s[i]), find(e[i])).se;
        
    }
    for(int i = 1; i < 17; i++){
        for(int j = 1; j <= n; j++){
            pref[j][i] = pref[pref[j][i - 1]][i - 1];
        }
    }
    for(int i = 0; i < q; i++){
        int l, r; cin >> l >> r;
        if(l == r){
            cout << 0 << "\n";
        }else if(s[r] <= e[l]){
            if(e[r] >= e[l]){
                cout << 1 << "\n";
            }else{
                cout << "impossible" << "\n";
            }
        }else{
            int ans = 0;
            for(int i = 16; i >= 0; i--){
                int id = pref[r][i];
                
                if(s[id] > e[l]){
                    ans += (1 << i); r = pref[r][i];
                }
            }
            
            r = pref[r][0];
            
            if(s[r] <= e[l] && e[r] >= e[l]){
                cout << ans + 2 << "\n";
            }else{
                cout << "impossible" << "\n";
            }
        }
        
    }
    return(0);
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 128 ms 35804 KB Output is correct
3 Correct 129 ms 35820 KB Output is correct
4 Correct 147 ms 35784 KB Output is correct
5 Correct 139 ms 35952 KB Output is correct
6 Correct 147 ms 35980 KB Output is correct
7 Correct 134 ms 36024 KB Output is correct
8 Incorrect 130 ms 36356 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 596 KB Output is correct
4 Correct 1 ms 596 KB Output is correct
5 Correct 1 ms 596 KB Output is correct
6 Correct 1 ms 596 KB Output is correct
7 Correct 1 ms 596 KB Output is correct
8 Correct 1 ms 596 KB Output is correct
9 Correct 1 ms 596 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 596 KB Output is correct
4 Correct 1 ms 596 KB Output is correct
5 Correct 1 ms 596 KB Output is correct
6 Correct 1 ms 596 KB Output is correct
7 Correct 1 ms 596 KB Output is correct
8 Correct 1 ms 596 KB Output is correct
9 Correct 1 ms 596 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 596 KB Output is correct
13 Correct 1 ms 596 KB Output is correct
14 Correct 1 ms 596 KB Output is correct
15 Correct 2 ms 596 KB Output is correct
16 Correct 2 ms 596 KB Output is correct
17 Correct 2 ms 596 KB Output is correct
18 Correct 1 ms 596 KB Output is correct
19 Correct 27 ms 2548 KB Output is correct
20 Correct 24 ms 2644 KB Output is correct
21 Correct 30 ms 2928 KB Output is correct
22 Correct 22 ms 2900 KB Output is correct
23 Correct 21 ms 2772 KB Output is correct
24 Correct 25 ms 2772 KB Output is correct
25 Correct 23 ms 2444 KB Output is correct

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 596 KB Output is correct
4 Correct 1 ms 596 KB Output is correct
5 Correct 1 ms 596 KB Output is correct
6 Correct 1 ms 596 KB Output is correct
7 Correct 1 ms 596 KB Output is correct
8 Correct 1 ms 596 KB Output is correct
9 Correct 1 ms 596 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 1 ms 596 KB Output is correct
13 Correct 1 ms 596 KB Output is correct
14 Correct 1 ms 596 KB Output is correct
15 Correct 1 ms 596 KB Output is correct
16 Correct 1 ms 596 KB Output is correct
17 Correct 1 ms 596 KB Output is correct
18 Correct 1 ms 596 KB Output is correct
19 Correct 115 ms 35292 KB Output is correct
20 Correct 122 ms 36336 KB Output is correct
21 Incorrect 113 ms 37084 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 126 ms 35864 KB Output is correct
2 Correct 142 ms 35912 KB Output is correct
3 Correct 161 ms 35800 KB Output is correct
4 Correct 125 ms 36376 KB Output is correct
5 Correct 142 ms 36288 KB Output is correct
6 Correct 148 ms 39096 KB Output is correct
7 Correct 174 ms 39108 KB Output is correct
8 Correct 134 ms 39252 KB Output is correct
9 Correct 109 ms 37116 KB Output is correct
10 Correct 152 ms 38804 KB Output is correct
11 Correct 132 ms 38592 KB Output is correct
12 Correct 131 ms 38752 KB Output is correct

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 128 ms 35804 KB Output is correct
3 Correct 129 ms 35820 KB Output is correct
4 Correct 147 ms 35784 KB Output is correct
5 Correct 139 ms 35952 KB Output is correct
6 Correct 147 ms 35980 KB Output is correct
7 Correct 134 ms 36024 KB Output is correct
8 Incorrect 130 ms 36356 KB Output isn't correct
9 Halted 0 ms 0 KB -