oj.uz

Submission #677071

# Submission time Handle Problem Language Result Execution time Memory
677071 2023-01-02T08:31:57 Z Do_you_copy Event Hopping (BOI22_events) C++17
100 / 100
 214 ms 16100 KB 
//Then
#include <bits/stdc++.h>
#define pb push_back
#define fi first
#define se second
#define faster ios_base::sync_with_stdio(0); cin.tie(0);

using namespace std;
using ll = long long;
using ld = long double;
using pii = pair <int, int>;
mt19937_64 Rand(chrono::steady_clock::now().time_since_epoch().count());
const int maxN = 4e5 + 1;
//const int Mod = 1e9 + 7;
//const int inf =
int n, q;
bool invalid[maxN];
pii e[maxN];
int lift[maxN][20];
vector <int> node;
int st[maxN * 4];

void update(int id, int i, int x, int l = 1, int r = node.size()){
    if (l == r){
        if (e[st[id]].fi > e[x].fi) st[id] = x;
        return;
    }
    int mid = (l + r) >> 1;
    if (i <= mid) update(id << 1, i, x, l, mid);
    else update(id << 1 | 1, i, x, mid + 1, r);
    if (e[st[id << 1]].fi < e[st[id << 1 | 1]].fi) st[id] = st[id << 1];
    else st[id] = st[id << 1 | 1];
}

int get(int id, int i, int j, int l = 1, int r = node.size()){
    if (i > r || l > j) return 0;
    if (i <= l && r <= j) return st[id];
    int mid = (l + r) >> 1;
    int x = get(id << 1, i, j, l, mid);
    int y = get(id << 1 | 1, i, j, mid + 1, r);
    if (e[x].fi < e[y].fi) return x;
    else return y;
}

void Init(){
    cin >> n >> q;
    for (int i = 1; i <= n; ++i){
        cin >> e[i].fi >> e[i].se;
        node.pb(e[i].fi);
        node.pb(e[i].se);
    }
    e[0].fi = INT_MAX;
    sort(node.begin(), node.end());
    node.resize(unique(node.begin(), node.end()) - node.begin());
    for (int i = 1; i <= n; ++i){
        e[i].fi = upper_bound(node.begin(), node.end(), e[i].fi) - node.begin();
        e[i].se = upper_bound(node.begin(), node.end(), e[i].se) - node.begin();
        update(1, e[i].se, i);
    }
    for (int i = 1; i <= n; ++i){
        int u = get(1, e[i].fi, e[i].se);
        if (e[u].fi == e[i].fi) continue;
        lift[i][0] = u;
    }
    for (int i = 1; i < 20; ++i){
        for (int j = 1; j <= n; ++j){
            lift[j][i] = lift[lift[j][i - 1]][i - 1];
        }
    }
    e[0].fi = 0;
    while (q--){
        int s, t;
        cin >> s >> t;
        if (s == t){
            cout << "0\n"; continue;
        }
        if (e[t].se < e[s].se){
            cout << "impossible\n"; continue;
        }
        if (e[t].fi <= e[s].se){
            cout << "1\n"; continue;
        }
        int ans = 0;
        for (int i = 19; i >= 0; --i){
            if (e[lift[t][i]].fi > e[s].se){
                t = lift[t][i];
                ans += 1 << i;
            }
        }
        t = lift[t][0];
        if (t == 0){
            cout << "impossible\n"; continue;
        }
        cout << ans + 2 << "\n";
    }
}

#define debug
#define taskname "test"
signed main(){
    faster
    if (fopen(taskname".inp", "r")){
        freopen(taskname".inp", "r", stdin);
        freopen(taskname".out", "w", stdout);
    }
    int tt = 1;
    //cin >> tt;
    while (tt--){
        Init();
    }
    if (fopen("timeout.txt", "r")){
        ofstream timeout("timeout.txt");
        timeout << signed(double(clock()) / CLOCKS_PER_SEC * 1000);
        timeout.close();
        #ifndef debug
        cerr << "Time elapsed: " << signed(double(clock()) / CLOCKS_PER_SEC * 1000) << "ms\n";
        #endif // debug
    }
}

Compilation message

events.cpp: In function 'int main()':
events.cpp:103:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  103 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
events.cpp:104:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  104 |         freopen(taskname".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 147 ms 11640 KB Output is correct
3 Correct 145 ms 11748 KB Output is correct
4 Correct 200 ms 11740 KB Output is correct
5 Correct 162 ms 11832 KB Output is correct
6 Correct 151 ms 11836 KB Output is correct
7 Correct 146 ms 11772 KB Output is correct
8 Correct 134 ms 14148 KB Output is correct
9 Correct 126 ms 16100 KB Output is correct
10 Correct 166 ms 14904 KB Output is correct
11 Correct 162 ms 16076 KB Output is correct
12 Correct 87 ms 14280 KB Output is correct

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 1 ms 596 KB Output is correct
4 Correct 1 ms 476 KB Output is correct
5 Correct 1 ms 472 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 2 ms 468 KB Output is correct
8 Correct 2 ms 484 KB Output is correct
9 Correct 1 ms 468 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 1 ms 596 KB Output is correct
4 Correct 1 ms 476 KB Output is correct
5 Correct 1 ms 472 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 2 ms 468 KB Output is correct
8 Correct 2 ms 484 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 2 ms 480 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 2 ms 468 KB Output is correct
16 Correct 2 ms 508 KB Output is correct
17 Correct 2 ms 468 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 35 ms 1664 KB Output is correct
20 Correct 30 ms 1624 KB Output is correct
21 Correct 36 ms 1956 KB Output is correct
22 Correct 25 ms 1960 KB Output is correct
23 Correct 25 ms 1828 KB Output is correct
24 Correct 23 ms 1752 KB Output is correct
25 Correct 33 ms 1480 KB Output is correct

Subtask #4
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 1 ms 596 KB Output is correct
4 Correct 1 ms 476 KB Output is correct
5 Correct 1 ms 472 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 2 ms 468 KB Output is correct
8 Correct 2 ms 484 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 2 ms 480 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 476 KB Output is correct
15 Correct 2 ms 468 KB Output is correct
16 Correct 2 ms 472 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 105 ms 11224 KB Output is correct
20 Correct 111 ms 11076 KB Output is correct
21 Correct 125 ms 11128 KB Output is correct
22 Correct 118 ms 12184 KB Output is correct
23 Correct 132 ms 12852 KB Output is correct
24 Correct 150 ms 13816 KB Output is correct
25 Correct 39 ms 11108 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 133 ms 11644 KB Output is correct
2 Correct 138 ms 11688 KB Output is correct
3 Correct 185 ms 11644 KB Output is correct
4 Correct 138 ms 14116 KB Output is correct
5 Correct 182 ms 14888 KB Output is correct
6 Correct 180 ms 15752 KB Output is correct
7 Correct 170 ms 15720 KB Output is correct
8 Correct 161 ms 15844 KB Output is correct
9 Correct 131 ms 12808 KB Output is correct
10 Correct 162 ms 15348 KB Output is correct
11 Correct 166 ms 14860 KB Output is correct
12 Correct 167 ms 15312 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 147 ms 11640 KB Output is correct
3 Correct 145 ms 11748 KB Output is correct
4 Correct 200 ms 11740 KB Output is correct
5 Correct 162 ms 11832 KB Output is correct
6 Correct 151 ms 11836 KB Output is correct
7 Correct 146 ms 11772 KB Output is correct
8 Correct 134 ms 14148 KB Output is correct
9 Correct 126 ms 16100 KB Output is correct
10 Correct 166 ms 14904 KB Output is correct
11 Correct 162 ms 16076 KB Output is correct
12 Correct 87 ms 14280 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 596 KB Output is correct
16 Correct 1 ms 476 KB Output is correct
17 Correct 1 ms 472 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 2 ms 468 KB Output is correct
20 Correct 2 ms 484 KB Output is correct
21 Correct 1 ms 468 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 0 ms 340 KB Output is correct
24 Correct 2 ms 480 KB Output is correct
25 Correct 1 ms 384 KB Output is correct
26 Correct 1 ms 468 KB Output is correct
27 Correct 2 ms 468 KB Output is correct
28 Correct 2 ms 508 KB Output is correct
29 Correct 2 ms 468 KB Output is correct
30 Correct 1 ms 468 KB Output is correct
31 Correct 35 ms 1664 KB Output is correct
32 Correct 30 ms 1624 KB Output is correct
33 Correct 36 ms 1956 KB Output is correct
34 Correct 25 ms 1960 KB Output is correct
35 Correct 25 ms 1828 KB Output is correct
36 Correct 23 ms 1752 KB Output is correct
37 Correct 33 ms 1480 KB Output is correct
38 Correct 1 ms 340 KB Output is correct
39 Correct 1 ms 340 KB Output is correct
40 Correct 2 ms 480 KB Output is correct
41 Correct 1 ms 468 KB Output is correct
42 Correct 1 ms 476 KB Output is correct
43 Correct 2 ms 468 KB Output is correct
44 Correct 2 ms 472 KB Output is correct
45 Correct 1 ms 468 KB Output is correct
46 Correct 1 ms 468 KB Output is correct
47 Correct 105 ms 11224 KB Output is correct
48 Correct 111 ms 11076 KB Output is correct
49 Correct 125 ms 11128 KB Output is correct
50 Correct 118 ms 12184 KB Output is correct
51 Correct 132 ms 12852 KB Output is correct
52 Correct 150 ms 13816 KB Output is correct
53 Correct 39 ms 11108 KB Output is correct
54 Correct 133 ms 11644 KB Output is correct
55 Correct 138 ms 11688 KB Output is correct
56 Correct 185 ms 11644 KB Output is correct
57 Correct 138 ms 14116 KB Output is correct
58 Correct 182 ms 14888 KB Output is correct
59 Correct 180 ms 15752 KB Output is correct
60 Correct 170 ms 15720 KB Output is correct
61 Correct 161 ms 15844 KB Output is correct
62 Correct 131 ms 12808 KB Output is correct
63 Correct 162 ms 15348 KB Output is correct
64 Correct 166 ms 14860 KB Output is correct
65 Correct 167 ms 15312 KB Output is correct
66 Correct 1 ms 468 KB Output is correct
67 Correct 131 ms 14544 KB Output is correct
68 Correct 145 ms 14556 KB Output is correct
69 Correct 191 ms 14572 KB Output is correct
70 Correct 153 ms 14596 KB Output is correct
71 Correct 138 ms 14672 KB Output is correct
72 Correct 174 ms 14616 KB Output is correct
73 Correct 150 ms 16100 KB Output is correct
74 Correct 143 ms 16076 KB Output is correct
75 Correct 184 ms 14896 KB Output is correct
76 Correct 152 ms 16008 KB Output is correct
77 Correct 136 ms 14232 KB Output is correct
78 Correct 1 ms 340 KB Output is correct
79 Correct 1 ms 468 KB Output is correct
80 Correct 1 ms 468 KB Output is correct
81 Correct 1 ms 468 KB Output is correct
82 Correct 3 ms 468 KB Output is correct
83 Correct 1 ms 484 KB Output is correct
84 Correct 1 ms 468 KB Output is correct
85 Correct 1 ms 352 KB Output is correct
86 Correct 41 ms 2372 KB Output is correct
87 Correct 48 ms 2380 KB Output is correct
88 Correct 51 ms 2604 KB Output is correct
89 Correct 27 ms 2676 KB Output is correct
90 Correct 24 ms 2636 KB Output is correct
91 Correct 23 ms 2592 KB Output is correct
92 Correct 30 ms 2252 KB Output is correct
93 Correct 119 ms 12780 KB Output is correct
94 Correct 118 ms 12028 KB Output is correct
95 Correct 121 ms 12740 KB Output is correct
96 Correct 128 ms 13784 KB Output is correct
97 Correct 140 ms 12844 KB Output is correct
98 Correct 180 ms 13800 KB Output is correct
99 Correct 40 ms 11100 KB Output is correct
100 Correct 202 ms 15688 KB Output is correct
101 Correct 214 ms 15668 KB Output is correct
102 Correct 214 ms 15880 KB Output is correct
103 Correct 159 ms 15316 KB Output is correct
104 Correct 186 ms 14944 KB Output is correct
105 Correct 197 ms 15336 KB Output is correct
106 Correct 137 ms 13936 KB Output is correct
107 Correct 196 ms 13928 KB Output is correct
108 Correct 177 ms 14640 KB Output is correct
109 Correct 148 ms 14704 KB Output is correct
110 Correct 171 ms 15624 KB Output is correct
111 Correct 186 ms 15632 KB Output is correct