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Submission #580411

# Submission time Handle Problem Language Result Execution time Memory
580411 2022-06-21T08:10:44 Z 조영욱(#8357) Event Hopping (BOI22_events) C++17
100 / 100
 217 ms 13812 KB 
#include <bits/stdc++.h>
using namespace std;

int n,q;
typedef pair<int,int> P;
P arr[100000];
vector<int> pr;
const int sz=262144;
P seg[sz*2];
int table[100000][17];

P merge(P a,P b) {
    return a<b?a:b;
}

P sum(int l,int r,int node=1,int nodel=0,int noder=sz-1) {
    if (r<nodel||l>noder) {
        return P(1e9+7,-1);
    }
    if (l<=nodel&&noder<=r) {
        return seg[node];
    }
    int mid=(nodel+noder)/2;
    return merge(sum(l,r,node*2,nodel,mid),sum(l,r,node*2+1,mid+1,noder));
}

void update(int i,P val) {
    i+=sz;
    seg[i]=merge(seg[i],val);
    while (i>1) {
        i/=2;
        seg[i]=merge(seg[i*2],seg[i*2+1]);
    }
}

int main(void) {
    scanf("%d %d",&n,&q);
    for(int i=1;i<sz*2;i++) {
        seg[i]=P(1e9+7,-1);
    }
    for(int i=0;i<n;i++) {
        scanf("%d %d",&arr[i].first,&arr[i].second);
        pr.push_back(arr[i].first);
        pr.push_back(arr[i].second);
    }
    sort(pr.begin(),pr.end());
    pr.erase(unique(pr.begin(),pr.end()),pr.end());
    for(int i=0;i<n;i++) {
        arr[i].first=lower_bound(pr.begin(),pr.end(),arr[i].first)-pr.begin();
        arr[i].second=lower_bound(pr.begin(),pr.end(),arr[i].second)-pr.begin();
        //printf("%d %d\n",arr[i].first,arr[i].second);
        update(arr[i].second,P(arr[i].first,i));
    }
    memset(table,-1,sizeof(table));
    for(int i=0;i<n;i++) {
        P val=sum(arr[i].first,arr[i].second);
        //printf("%d %d\n",val.first,val.second);
        if (val.first<arr[i].first) {
            table[i][0]=val.second;
        }
        //printf("%d.\n",table[i][0]);
    }
    for(int j=1;j<17;j++) {
        for(int i=0;i<n;i++) {
            if (table[i][j-1]!=-1) {
                table[i][j]=table[table[i][j-1]][j-1];
            }
        }
    }
    for(int i=0;i<q;i++) {
        int s,e;
        scanf("%d %d",&s,&e);
        s--;
        e--;
        if (s==e) {
            printf("0\n");
            continue;
        }
        if (arr[e].second<arr[s].second) {
            printf("impossible\n");
            continue;
        }
        if (arr[e].first<=arr[s].second) {
            printf("1\n");
            continue;
        }
        int now=e;
        int ret=0;
        for(int j=16;j>=0;j--) {
            int nt=table[now][j];
            //printf("%d %d %d\n",i,j,nt);
            if (nt!=-1&&arr[nt].first>arr[s].second) {
                ret+=(1<<j);
                now=nt;
            }
        }
        int nt=table[now][0];
        if (nt==-1||arr[nt].first>arr[s].second) {
            printf("impossible\n");
            continue;
        }
        printf("%d\n",ret+2);
    }
}

Compilation message

events.cpp: In function 'int main()':
events.cpp:37:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |     scanf("%d %d",&n,&q);
      |     ~~~~~^~~~~~~~~~~~~~~
events.cpp:42:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |         scanf("%d %d",&arr[i].first,&arr[i].second);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
events.cpp:72:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |         scanf("%d %d",&s,&e);
      |         ~~~~~^~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 10960 KB Output is correct
2 Correct 132 ms 13280 KB Output is correct
3 Correct 141 ms 13244 KB Output is correct
4 Correct 174 ms 13444 KB Output is correct
5 Correct 156 ms 13348 KB Output is correct
6 Correct 149 ms 13396 KB Output is correct
7 Correct 154 ms 13432 KB Output is correct
8 Correct 135 ms 13780 KB Output is correct
9 Correct 127 ms 13784 KB Output is correct
10 Correct 154 ms 13640 KB Output is correct
11 Correct 141 ms 13652 KB Output is correct
12 Correct 105 ms 13776 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 10964 KB Output is correct
2 Correct 5 ms 10964 KB Output is correct
3 Correct 5 ms 11040 KB Output is correct
4 Correct 6 ms 10964 KB Output is correct
5 Correct 6 ms 10964 KB Output is correct
6 Correct 6 ms 10964 KB Output is correct
7 Correct 6 ms 11092 KB Output is correct
8 Correct 6 ms 11092 KB Output is correct
9 Correct 6 ms 10964 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 10964 KB Output is correct
2 Correct 5 ms 10964 KB Output is correct
3 Correct 5 ms 11040 KB Output is correct
4 Correct 6 ms 10964 KB Output is correct
5 Correct 6 ms 10964 KB Output is correct
6 Correct 6 ms 10964 KB Output is correct
7 Correct 6 ms 11092 KB Output is correct
8 Correct 6 ms 11092 KB Output is correct
9 Correct 6 ms 10964 KB Output is correct
10 Correct 5 ms 10988 KB Output is correct
11 Correct 7 ms 11044 KB Output is correct
12 Correct 6 ms 10964 KB Output is correct
13 Correct 9 ms 10964 KB Output is correct
14 Correct 6 ms 10964 KB Output is correct
15 Correct 6 ms 10964 KB Output is correct
16 Correct 6 ms 10968 KB Output is correct
17 Correct 6 ms 11092 KB Output is correct
18 Correct 6 ms 11092 KB Output is correct
19 Correct 45 ms 11604 KB Output is correct
20 Correct 44 ms 11596 KB Output is correct
21 Correct 47 ms 11904 KB Output is correct
22 Correct 38 ms 11920 KB Output is correct
23 Correct 35 ms 11860 KB Output is correct
24 Correct 31 ms 11788 KB Output is correct
25 Correct 37 ms 11468 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 10964 KB Output is correct
2 Correct 5 ms 10964 KB Output is correct
3 Correct 5 ms 11040 KB Output is correct
4 Correct 6 ms 10964 KB Output is correct
5 Correct 6 ms 10964 KB Output is correct
6 Correct 6 ms 10964 KB Output is correct
7 Correct 6 ms 11092 KB Output is correct
8 Correct 6 ms 11092 KB Output is correct
9 Correct 6 ms 10964 KB Output is correct
10 Correct 6 ms 10980 KB Output is correct
11 Correct 7 ms 11044 KB Output is correct
12 Correct 6 ms 11032 KB Output is correct
13 Correct 6 ms 10964 KB Output is correct
14 Correct 7 ms 11008 KB Output is correct
15 Correct 6 ms 10964 KB Output is correct
16 Correct 6 ms 11092 KB Output is correct
17 Correct 7 ms 10964 KB Output is correct
18 Correct 7 ms 10976 KB Output is correct
19 Correct 120 ms 12732 KB Output is correct
20 Correct 119 ms 12732 KB Output is correct
21 Correct 123 ms 12624 KB Output is correct
22 Correct 121 ms 12632 KB Output is correct
23 Correct 130 ms 12736 KB Output is correct
24 Correct 122 ms 12624 KB Output is correct
25 Correct 63 ms 12628 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 160 ms 13268 KB Output is correct
2 Correct 146 ms 13252 KB Output is correct
3 Correct 217 ms 13200 KB Output is correct
4 Correct 129 ms 13812 KB Output is correct
5 Correct 169 ms 13632 KB Output is correct
6 Correct 203 ms 13372 KB Output is correct
7 Correct 182 ms 13452 KB Output is correct
8 Correct 174 ms 13540 KB Output is correct
9 Correct 187 ms 12632 KB Output is correct
10 Correct 175 ms 13136 KB Output is correct
11 Correct 177 ms 12896 KB Output is correct
12 Correct 181 ms 13064 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 10960 KB Output is correct
2 Correct 132 ms 13280 KB Output is correct
3 Correct 141 ms 13244 KB Output is correct
4 Correct 174 ms 13444 KB Output is correct
5 Correct 156 ms 13348 KB Output is correct
6 Correct 149 ms 13396 KB Output is correct
7 Correct 154 ms 13432 KB Output is correct
8 Correct 135 ms 13780 KB Output is correct
9 Correct 127 ms 13784 KB Output is correct
10 Correct 154 ms 13640 KB Output is correct
11 Correct 141 ms 13652 KB Output is correct
12 Correct 105 ms 13776 KB Output is correct
13 Correct 5 ms 10964 KB Output is correct
14 Correct 5 ms 10964 KB Output is correct
15 Correct 5 ms 11040 KB Output is correct
16 Correct 6 ms 10964 KB Output is correct
17 Correct 6 ms 10964 KB Output is correct
18 Correct 6 ms 10964 KB Output is correct
19 Correct 6 ms 11092 KB Output is correct
20 Correct 6 ms 11092 KB Output is correct
21 Correct 6 ms 10964 KB Output is correct
22 Correct 5 ms 10988 KB Output is correct
23 Correct 7 ms 11044 KB Output is correct
24 Correct 6 ms 10964 KB Output is correct
25 Correct 9 ms 10964 KB Output is correct
26 Correct 6 ms 10964 KB Output is correct
27 Correct 6 ms 10964 KB Output is correct
28 Correct 6 ms 10968 KB Output is correct
29 Correct 6 ms 11092 KB Output is correct
30 Correct 6 ms 11092 KB Output is correct
31 Correct 45 ms 11604 KB Output is correct
32 Correct 44 ms 11596 KB Output is correct
33 Correct 47 ms 11904 KB Output is correct
34 Correct 38 ms 11920 KB Output is correct
35 Correct 35 ms 11860 KB Output is correct
36 Correct 31 ms 11788 KB Output is correct
37 Correct 37 ms 11468 KB Output is correct
38 Correct 6 ms 10980 KB Output is correct
39 Correct 7 ms 11044 KB Output is correct
40 Correct 6 ms 11032 KB Output is correct
41 Correct 6 ms 10964 KB Output is correct
42 Correct 7 ms 11008 KB Output is correct
43 Correct 6 ms 10964 KB Output is correct
44 Correct 6 ms 11092 KB Output is correct
45 Correct 7 ms 10964 KB Output is correct
46 Correct 7 ms 10976 KB Output is correct
47 Correct 120 ms 12732 KB Output is correct
48 Correct 119 ms 12732 KB Output is correct
49 Correct 123 ms 12624 KB Output is correct
50 Correct 121 ms 12632 KB Output is correct
51 Correct 130 ms 12736 KB Output is correct
52 Correct 122 ms 12624 KB Output is correct
53 Correct 63 ms 12628 KB Output is correct
54 Correct 160 ms 13268 KB Output is correct
55 Correct 146 ms 13252 KB Output is correct
56 Correct 217 ms 13200 KB Output is correct
57 Correct 129 ms 13812 KB Output is correct
58 Correct 169 ms 13632 KB Output is correct
59 Correct 203 ms 13372 KB Output is correct
60 Correct 182 ms 13452 KB Output is correct
61 Correct 174 ms 13540 KB Output is correct
62 Correct 187 ms 12632 KB Output is correct
63 Correct 175 ms 13136 KB Output is correct
64 Correct 177 ms 12896 KB Output is correct
65 Correct 181 ms 13064 KB Output is correct
66 Correct 7 ms 10988 KB Output is correct
67 Correct 144 ms 13324 KB Output is correct
68 Correct 170 ms 13252 KB Output is correct
69 Correct 169 ms 13252 KB Output is correct
70 Correct 148 ms 13324 KB Output is correct
71 Correct 153 ms 13300 KB Output is correct
72 Correct 167 ms 13392 KB Output is correct
73 Correct 136 ms 13776 KB Output is correct
74 Correct 127 ms 13784 KB Output is correct
75 Correct 164 ms 13588 KB Output is correct
76 Correct 139 ms 13756 KB Output is correct
77 Correct 97 ms 13760 KB Output is correct
78 Correct 5 ms 10964 KB Output is correct
79 Correct 6 ms 10968 KB Output is correct
80 Correct 8 ms 11056 KB Output is correct
81 Correct 6 ms 10964 KB Output is correct
82 Correct 7 ms 10964 KB Output is correct
83 Correct 6 ms 10964 KB Output is correct
84 Correct 6 ms 10964 KB Output is correct
85 Correct 5 ms 10964 KB Output is correct
86 Correct 45 ms 11684 KB Output is correct
87 Correct 39 ms 11692 KB Output is correct
88 Correct 42 ms 11852 KB Output is correct
89 Correct 35 ms 11920 KB Output is correct
90 Correct 33 ms 11724 KB Output is correct
91 Correct 34 ms 11876 KB Output is correct
92 Correct 39 ms 11464 KB Output is correct
93 Correct 108 ms 12632 KB Output is correct
94 Correct 112 ms 12624 KB Output is correct
95 Correct 130 ms 12620 KB Output is correct
96 Correct 114 ms 12672 KB Output is correct
97 Correct 137 ms 12624 KB Output is correct
98 Correct 113 ms 12624 KB Output is correct
99 Correct 64 ms 12636 KB Output is correct
100 Correct 178 ms 13504 KB Output is correct
101 Correct 160 ms 13384 KB Output is correct
102 Correct 190 ms 13680 KB Output is correct
103 Correct 166 ms 13112 KB Output is correct
104 Correct 177 ms 12884 KB Output is correct
105 Correct 155 ms 13032 KB Output is correct
106 Correct 146 ms 13472 KB Output is correct
107 Correct 157 ms 13484 KB Output is correct
108 Correct 182 ms 13440 KB Output is correct
109 Correct 152 ms 13504 KB Output is correct
110 Correct 175 ms 13400 KB Output is correct
111 Correct 194 ms 13396 KB Output is correct