oj.uz

Submission #645244

# Submission time Handle Problem Language Result Execution time Memory
645244 2022-09-26T13:51:33 Z Vladth11 Event Hopping (BOI22_events) C++14
100 / 100
 200 ms 28536 KB 
#include <bits/stdc++.h>

#define debug(x) cerr << #x << " " << x << "\n"
#define debugs(x) cerr << #x << " " << x << " "

#pragma GCC optimize("Ofast")

using namespace std;
typedef long long ll;
typedef pair <int, int> pii;

const int bSize = 100001;
const int bits = 17;
const int NMAX = 100001;
const int VMAX = NMAX * 89;

int dp[NMAX][bits + 1];

pii aint[NMAX * 8];
unordered_map <int, int> mp;
pii v[NMAX];

bool cmp(pii a, pii b){
    if(a.second != b.second){
        return a.second > b.second;
    }
    return a.first > b.first;
}

void update(int node, int st, int dr, int a, pii p){
    if(st == dr){
        aint[node] = min(aint[node], p);
        return;
    }
    int mid = (st + dr) / 2;
    if(a <= mid){
        update(node * 2, st, mid, a, p);
    }else{
        update(node * 2 + 1, mid + 1, dr, a, p);
    }
    aint[node] = min(aint[node * 2], aint[node * 2 + 1]);
}

pii query(int node, int st, int dr, int a, int b){
    if(a <= st && dr <= b){
        return aint[node];
    }
    int mid = (st + dr) / 2;
    pii maxim = {1e9, 1e9};
    if(a <= mid)
        maxim = min(maxim, query(node * 2, st, mid, a, b));
    if(b > mid)
        maxim = min(maxim, query(node * 2 + 1, mid + 1, dr, a, b));
    return maxim;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int n, q, i;
    cin >> n >> q;
    for(i = 0; i < NMAX * 8; i++){
        aint[i] = {1e9, 1e9};
    }
    vector <int> nrm;
    for(i = 1; i <= n; i++){
        cin >> v[i].first >> v[i].second;
        nrm.push_back(v[i].first);
        nrm.push_back(v[i].second);
    }
    int cnt = 0;
    sort(nrm.begin(), nrm.end());
    for(int i = 0; i < nrm.size(); i++){
        if(i == 0 || nrm[i] != nrm[i - 1])
            cnt++;
        mp[nrm[i]] = cnt;
    }
    for(i = 1; i <= n; i++){
        v[i].first = mp[v[i].first];
        v[i].second = mp[v[i].second];
    }
    for(i = 1; i <= n; i++){
        update(1, 1, 2 * n, v[i].second, {v[i].first, i});
    }
    for(i = 1; i <= n; i++){
        pii maxim = query(1, 1, 2 * n, v[i].first, v[i].second);
        dp[i][0] = maxim.second;
    }
    for(int j = 1; j <= bits; j++){
        for(int i = 1; i <= n; i++){
            dp[i][j] = dp[dp[i][j - 1]][j - 1]; /// Oare cand nu o sa mai uit sa fac stramosii
        }
    }
    while(q--){
        int x, y;
        cin >> x >> y;
        int node = y;
        int sol = 0;
        int pas = bits;
        while(pas >= 0){
            int nxt = dp[node][pas];
            if(nxt != 0 && v[nxt].first > v[x].second){
                node = nxt;
                sol += (1 << pas);
            }
            pas--;
        }
        if(v[node].first > v[x].second){
            node = dp[node][0];
            sol++;
        }
        if(v[node].first <= v[x].second && v[x].second <= v[node].second){
            cout << sol + (x != y) << "\n";
        }else{
            cout << "impossible\n";
        }
    }
    return 0;
}

Compilation message

events.cpp: In function 'int main()':
events.cpp:74:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   74 |     for(int i = 0; i < nrm.size(); i++){
      |                    ~~^~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 6484 KB Output is correct
2 Correct 116 ms 23336 KB Output is correct
3 Correct 134 ms 23380 KB Output is correct
4 Correct 151 ms 23268 KB Output is correct
5 Correct 127 ms 23732 KB Output is correct
6 Correct 137 ms 23948 KB Output is correct
7 Correct 133 ms 24116 KB Output is correct
8 Correct 140 ms 28392 KB Output is correct
9 Correct 149 ms 28292 KB Output is correct
10 Correct 145 ms 23676 KB Output is correct
11 Correct 134 ms 25112 KB Output is correct
12 Correct 83 ms 23128 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 6484 KB Output is correct
2 Correct 4 ms 6484 KB Output is correct
3 Correct 4 ms 6684 KB Output is correct
4 Correct 4 ms 6740 KB Output is correct
5 Correct 4 ms 6612 KB Output is correct
6 Correct 4 ms 6748 KB Output is correct
7 Correct 4 ms 6740 KB Output is correct
8 Correct 4 ms 6740 KB Output is correct
9 Correct 3 ms 6612 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 6484 KB Output is correct
2 Correct 4 ms 6484 KB Output is correct
3 Correct 4 ms 6684 KB Output is correct
4 Correct 4 ms 6740 KB Output is correct
5 Correct 4 ms 6612 KB Output is correct
6 Correct 4 ms 6748 KB Output is correct
7 Correct 4 ms 6740 KB Output is correct
8 Correct 4 ms 6740 KB Output is correct
9 Correct 3 ms 6612 KB Output is correct
10 Correct 2 ms 6484 KB Output is correct
11 Correct 3 ms 6476 KB Output is correct
12 Correct 3 ms 6748 KB Output is correct
13 Correct 3 ms 6740 KB Output is correct
14 Correct 4 ms 6740 KB Output is correct
15 Correct 4 ms 6740 KB Output is correct
16 Correct 4 ms 6740 KB Output is correct
17 Correct 4 ms 6740 KB Output is correct
18 Correct 3 ms 6612 KB Output is correct
19 Correct 38 ms 8780 KB Output is correct
20 Correct 31 ms 8648 KB Output is correct
21 Correct 33 ms 8908 KB Output is correct
22 Correct 28 ms 8996 KB Output is correct
23 Correct 29 ms 9020 KB Output is correct
24 Correct 29 ms 9036 KB Output is correct
25 Correct 30 ms 8732 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 6484 KB Output is correct
2 Correct 4 ms 6484 KB Output is correct
3 Correct 4 ms 6684 KB Output is correct
4 Correct 4 ms 6740 KB Output is correct
5 Correct 4 ms 6612 KB Output is correct
6 Correct 4 ms 6748 KB Output is correct
7 Correct 4 ms 6740 KB Output is correct
8 Correct 4 ms 6740 KB Output is correct
9 Correct 3 ms 6612 KB Output is correct
10 Correct 3 ms 6488 KB Output is correct
11 Correct 4 ms 6484 KB Output is correct
12 Correct 4 ms 6740 KB Output is correct
13 Correct 3 ms 6740 KB Output is correct
14 Correct 4 ms 6620 KB Output is correct
15 Correct 5 ms 6628 KB Output is correct
16 Correct 4 ms 6744 KB Output is correct
17 Correct 4 ms 6740 KB Output is correct
18 Correct 3 ms 6680 KB Output is correct
19 Correct 118 ms 21584 KB Output is correct
20 Correct 84 ms 20776 KB Output is correct
21 Correct 112 ms 21428 KB Output is correct
22 Correct 102 ms 22756 KB Output is correct
23 Correct 144 ms 26116 KB Output is correct
24 Correct 149 ms 26132 KB Output is correct
25 Correct 53 ms 16560 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 115 ms 23300 KB Output is correct
2 Correct 120 ms 23332 KB Output is correct
3 Correct 156 ms 23316 KB Output is correct
4 Correct 149 ms 28536 KB Output is correct
5 Correct 131 ms 23732 KB Output is correct
6 Correct 190 ms 28000 KB Output is correct
7 Correct 176 ms 28008 KB Output is correct
8 Correct 200 ms 28124 KB Output is correct
9 Correct 138 ms 26024 KB Output is correct
10 Correct 157 ms 27676 KB Output is correct
11 Correct 162 ms 27396 KB Output is correct
12 Correct 176 ms 27628 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 6484 KB Output is correct
2 Correct 116 ms 23336 KB Output is correct
3 Correct 134 ms 23380 KB Output is correct
4 Correct 151 ms 23268 KB Output is correct
5 Correct 127 ms 23732 KB Output is correct
6 Correct 137 ms 23948 KB Output is correct
7 Correct 133 ms 24116 KB Output is correct
8 Correct 140 ms 28392 KB Output is correct
9 Correct 149 ms 28292 KB Output is correct
10 Correct 145 ms 23676 KB Output is correct
11 Correct 134 ms 25112 KB Output is correct
12 Correct 83 ms 23128 KB Output is correct
13 Correct 3 ms 6484 KB Output is correct
14 Correct 4 ms 6484 KB Output is correct
15 Correct 4 ms 6684 KB Output is correct
16 Correct 4 ms 6740 KB Output is correct
17 Correct 4 ms 6612 KB Output is correct
18 Correct 4 ms 6748 KB Output is correct
19 Correct 4 ms 6740 KB Output is correct
20 Correct 4 ms 6740 KB Output is correct
21 Correct 3 ms 6612 KB Output is correct
22 Correct 2 ms 6484 KB Output is correct
23 Correct 3 ms 6476 KB Output is correct
24 Correct 3 ms 6748 KB Output is correct
25 Correct 3 ms 6740 KB Output is correct
26 Correct 4 ms 6740 KB Output is correct
27 Correct 4 ms 6740 KB Output is correct
28 Correct 4 ms 6740 KB Output is correct
29 Correct 4 ms 6740 KB Output is correct
30 Correct 3 ms 6612 KB Output is correct
31 Correct 38 ms 8780 KB Output is correct
32 Correct 31 ms 8648 KB Output is correct
33 Correct 33 ms 8908 KB Output is correct
34 Correct 28 ms 8996 KB Output is correct
35 Correct 29 ms 9020 KB Output is correct
36 Correct 29 ms 9036 KB Output is correct
37 Correct 30 ms 8732 KB Output is correct
38 Correct 3 ms 6488 KB Output is correct
39 Correct 4 ms 6484 KB Output is correct
40 Correct 4 ms 6740 KB Output is correct
41 Correct 3 ms 6740 KB Output is correct
42 Correct 4 ms 6620 KB Output is correct
43 Correct 5 ms 6628 KB Output is correct
44 Correct 4 ms 6744 KB Output is correct
45 Correct 4 ms 6740 KB Output is correct
46 Correct 3 ms 6680 KB Output is correct
47 Correct 118 ms 21584 KB Output is correct
48 Correct 84 ms 20776 KB Output is correct
49 Correct 112 ms 21428 KB Output is correct
50 Correct 102 ms 22756 KB Output is correct
51 Correct 144 ms 26116 KB Output is correct
52 Correct 149 ms 26132 KB Output is correct
53 Correct 53 ms 16560 KB Output is correct
54 Correct 115 ms 23300 KB Output is correct
55 Correct 120 ms 23332 KB Output is correct
56 Correct 156 ms 23316 KB Output is correct
57 Correct 149 ms 28536 KB Output is correct
58 Correct 131 ms 23732 KB Output is correct
59 Correct 190 ms 28000 KB Output is correct
60 Correct 176 ms 28008 KB Output is correct
61 Correct 200 ms 28124 KB Output is correct
62 Correct 138 ms 26024 KB Output is correct
63 Correct 157 ms 27676 KB Output is correct
64 Correct 162 ms 27396 KB Output is correct
65 Correct 176 ms 27628 KB Output is correct
66 Correct 3 ms 6484 KB Output is correct
67 Correct 115 ms 23484 KB Output is correct
68 Correct 119 ms 23536 KB Output is correct
69 Correct 151 ms 23288 KB Output is correct
70 Correct 144 ms 23684 KB Output is correct
71 Correct 143 ms 24116 KB Output is correct
72 Correct 136 ms 24116 KB Output is correct
73 Correct 142 ms 28408 KB Output is correct
74 Correct 148 ms 28288 KB Output is correct
75 Correct 139 ms 23704 KB Output is correct
76 Correct 135 ms 24984 KB Output is correct
77 Correct 83 ms 23104 KB Output is correct
78 Correct 3 ms 6484 KB Output is correct
79 Correct 3 ms 6740 KB Output is correct
80 Correct 3 ms 6740 KB Output is correct
81 Correct 4 ms 6740 KB Output is correct
82 Correct 4 ms 6740 KB Output is correct
83 Correct 4 ms 6740 KB Output is correct
84 Correct 4 ms 6740 KB Output is correct
85 Correct 3 ms 6616 KB Output is correct
86 Correct 34 ms 8720 KB Output is correct
87 Correct 31 ms 8748 KB Output is correct
88 Correct 32 ms 8908 KB Output is correct
89 Correct 36 ms 8972 KB Output is correct
90 Correct 29 ms 9024 KB Output is correct
91 Correct 30 ms 9040 KB Output is correct
92 Correct 29 ms 8672 KB Output is correct
93 Correct 90 ms 21584 KB Output is correct
94 Correct 92 ms 20712 KB Output is correct
95 Correct 105 ms 21488 KB Output is correct
96 Correct 105 ms 22700 KB Output is correct
97 Correct 138 ms 26084 KB Output is correct
98 Correct 160 ms 26124 KB Output is correct
99 Correct 55 ms 16472 KB Output is correct
100 Correct 181 ms 28140 KB Output is correct
101 Correct 183 ms 27996 KB Output is correct
102 Correct 156 ms 28060 KB Output is correct
103 Correct 170 ms 27796 KB Output is correct
104 Correct 172 ms 27492 KB Output is correct
105 Correct 180 ms 27600 KB Output is correct
106 Correct 119 ms 21320 KB Output is correct
107 Correct 134 ms 22732 KB Output is correct
108 Correct 134 ms 23472 KB Output is correct
109 Correct 134 ms 23464 KB Output is correct
110 Correct 186 ms 27808 KB Output is correct
111 Correct 180 ms 27844 KB Output is correct