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Submission #746768

# Submission time Handle Problem Language Result Execution time Memory
746768 2023-05-23T04:40:17 Z bgnbvnbv Event Hopping (BOI22_events) C++14
100 / 100
 176 ms 28784 KB 
#include<bits/stdc++.h>
#define TASKNAME "codeforce"
#define pb push_back
#define pli pair<int,int>
#define fi first
#define se second
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL);
using namespace std;
using ll=long long;
const ll maxN=1e5+10;
const ll inf=1e18;
const ll mod=1e9+7;
struct node
{
    ll val,id;
    node()
    {
        val=inf,id=inf;
    }
    node operator+(const node&o)
    {
        node ans;
        if(val<o.val) ans.val=val,ans.id=id;
        else ans=o;
        return ans;
    }
}st[4*maxN];
ll n,q;
void update(ll pos,ll val,ll id=1,ll l=1,ll r=n)
{
    if(l==r)
    {
        st[id].val=val;
        st[id].id=l;
        return;
    }
    ll mid=l+r>>1;
    if(pos<=mid) update(pos,val,id*2,l,mid);
    else update(pos,val,id*2+1,mid+1,r);
    st[id]=st[id*2]+st[id*2+1];
}
node get(ll i,ll j,ll id=1,ll l=1,ll r=n)
{
    if(j<l||r<i) return node();
    if(i<=l&&r<=j) return st[id];
    ll mid=l+r>>1;
    return get(i,j,id*2,l,mid)+get(i,j,id*2+1,mid+1,r);
}
struct qq
{
    ll s,e,id;
    bool operator<(const qq&o)
    {
        if(e==o.e) return s<o.s;
        return e<o.e;
    }
}a[maxN];
ll pos[maxN];
ll pre[maxN][19];
void solve()
{
   cin >> n >> q;
   for(int i=1;i<=n;i++)
   {
        cin >> a[i].s >> a[i].e;
        a[i].id=i;
   }
   sort(a+1,a+n+1);
   for(int i=1;i<=n;i++)
   {
       pos[a[i].id]=i;
       ll low=1,high=i-1;
       while(low<=high)
       {
           ll mid=low+high>>1;
           if(a[mid].e<a[i].s) low=mid+1;
           else high=mid-1;
       }
       auto val=get(low,i-1);
       if(val.val==inf||val.val>=a[i].s) pre[i][0]=i;
       else pre[i][0]=val.id;
       update(i,a[i].s);
   }
   for(int j=1;j<=18;j++)
   {
       for(int i=1;i<=n;i++)
       {
           pre[i][j]=pre[pre[i][j-1]][j-1];
       }
   }
   for(int i=1;i<=q;i++)
   {
        ll x,y;
        cin >> x >> y;
        x=pos[x];
        y=pos[y];
        if(x==y)
        {
            cout << 0<<'\n';
        }
        else if(a[x].e==a[y].e)
        {
            cout << 1<<'\n';
        }
        else if(x>y)
        {
            cout << "impossible\n";
        }
        else if(a[x].e<=a[y].e&&a[x].e>=a[y].s)
        {
            cout << 1 << '\n';
        }
        else
        {
            ll ans=0;
            for(int j=18;j>=0;j--)
            {
                if(a[pre[y][j]].s>a[x].e)
                {
                    y=pre[y][j],ans+=1<<j;
                }
            }
            if(a[pre[y][0]].s<=a[x].e&&a[pre[y][0]].e>=a[x].e)
            {
                ans+=2;
                cout << ans << '\n';
            }
            else
            {
                cout << "impossible\n";
            }
        }
   }
}
int main()
{
    fastio
    //freopen(TASKNAME".INP","r",stdin);
    //freopen(TASKNAME".OUT","w",stdout);
    solve();
}

Compilation message

events.cpp: In function 'void update(ll, ll, ll, ll, ll)':
events.cpp:37:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   37 |     ll mid=l+r>>1;
      |            ~^~
events.cpp: In function 'node get(ll, ll, ll, ll, ll)':
events.cpp:46:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   46 |     ll mid=l+r>>1;
      |            ~^~
events.cpp: In function 'void solve()':
events.cpp:75:22: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   75 |            ll mid=low+high>>1;
      |                   ~~~^~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 6484 KB Output is correct
2 Correct 103 ms 25144 KB Output is correct
3 Correct 106 ms 25164 KB Output is correct
4 Correct 135 ms 25144 KB Output is correct
5 Correct 116 ms 28344 KB Output is correct
6 Correct 124 ms 28312 KB Output is correct
7 Correct 120 ms 28360 KB Output is correct
8 Correct 101 ms 28704 KB Output is correct
9 Correct 104 ms 28748 KB Output is correct
10 Correct 135 ms 28620 KB Output is correct
11 Correct 135 ms 28784 KB Output is correct
12 Correct 97 ms 27980 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 6484 KB Output is correct
2 Correct 3 ms 6608 KB Output is correct
3 Correct 3 ms 6740 KB Output is correct
4 Correct 5 ms 6720 KB Output is correct
5 Correct 4 ms 6740 KB Output is correct
6 Correct 4 ms 6736 KB Output is correct
7 Correct 5 ms 6740 KB Output is correct
8 Correct 4 ms 6732 KB Output is correct
9 Correct 3 ms 6740 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 6484 KB Output is correct
2 Correct 3 ms 6608 KB Output is correct
3 Correct 3 ms 6740 KB Output is correct
4 Correct 5 ms 6720 KB Output is correct
5 Correct 4 ms 6740 KB Output is correct
6 Correct 4 ms 6736 KB Output is correct
7 Correct 5 ms 6740 KB Output is correct
8 Correct 4 ms 6732 KB Output is correct
9 Correct 3 ms 6740 KB Output is correct
10 Correct 3 ms 6484 KB Output is correct
11 Correct 3 ms 6484 KB Output is correct
12 Correct 3 ms 6740 KB Output is correct
13 Correct 5 ms 6772 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 4 ms 6740 KB Output is correct
19 Correct 34 ms 8868 KB Output is correct
20 Correct 30 ms 8908 KB Output is correct
21 Correct 36 ms 9164 KB Output is correct
22 Correct 27 ms 9248 KB Output is correct
23 Correct 29 ms 9172 KB Output is correct
24 Correct 35 ms 9164 KB Output is correct
25 Correct 34 ms 8780 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 6484 KB Output is correct
2 Correct 3 ms 6608 KB Output is correct
3 Correct 3 ms 6740 KB Output is correct
4 Correct 5 ms 6720 KB Output is correct
5 Correct 4 ms 6740 KB Output is correct
6 Correct 4 ms 6736 KB Output is correct
7 Correct 5 ms 6740 KB Output is correct
8 Correct 4 ms 6732 KB Output is correct
9 Correct 3 ms 6740 KB Output is correct
10 Correct 3 ms 6548 KB Output is correct
11 Correct 3 ms 6596 KB Output is correct
12 Correct 4 ms 6712 KB Output is correct
13 Correct 3 ms 6736 KB Output is correct
14 Correct 4 ms 6740 KB Output is correct
15 Correct 4 ms 6728 KB Output is correct
16 Correct 4 ms 6740 KB Output is correct
17 Correct 4 ms 6740 KB Output is correct
18 Correct 4 ms 6728 KB Output is correct
19 Correct 83 ms 26496 KB Output is correct
20 Correct 74 ms 25720 KB Output is correct
21 Correct 92 ms 26484 KB Output is correct
22 Correct 81 ms 26444 KB Output is correct
23 Correct 85 ms 26484 KB Output is correct
24 Correct 94 ms 26496 KB Output is correct
25 Correct 66 ms 25868 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 133 ms 25120 KB Output is correct
2 Correct 113 ms 25140 KB Output is correct
3 Correct 115 ms 25048 KB Output is correct
4 Correct 120 ms 28676 KB Output is correct
5 Correct 161 ms 28608 KB Output is correct
6 Correct 158 ms 28400 KB Output is correct
7 Correct 154 ms 28288 KB Output is correct
8 Correct 145 ms 28616 KB Output is correct
9 Correct 75 ms 26508 KB Output is correct
10 Correct 123 ms 27964 KB Output is correct
11 Correct 120 ms 27788 KB Output is correct
12 Correct 137 ms 27976 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 6484 KB Output is correct
2 Correct 103 ms 25144 KB Output is correct
3 Correct 106 ms 25164 KB Output is correct
4 Correct 135 ms 25144 KB Output is correct
5 Correct 116 ms 28344 KB Output is correct
6 Correct 124 ms 28312 KB Output is correct
7 Correct 120 ms 28360 KB Output is correct
8 Correct 101 ms 28704 KB Output is correct
9 Correct 104 ms 28748 KB Output is correct
10 Correct 135 ms 28620 KB Output is correct
11 Correct 135 ms 28784 KB Output is correct
12 Correct 97 ms 27980 KB Output is correct
13 Correct 4 ms 6484 KB Output is correct
14 Correct 3 ms 6608 KB Output is correct
15 Correct 3 ms 6740 KB Output is correct
16 Correct 5 ms 6720 KB Output is correct
17 Correct 4 ms 6740 KB Output is correct
18 Correct 4 ms 6736 KB Output is correct
19 Correct 5 ms 6740 KB Output is correct
20 Correct 4 ms 6732 KB Output is correct
21 Correct 3 ms 6740 KB Output is correct
22 Correct 3 ms 6484 KB Output is correct
23 Correct 3 ms 6484 KB Output is correct
24 Correct 3 ms 6740 KB Output is correct
25 Correct 5 ms 6772 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 4 ms 6740 KB Output is correct
31 Correct 34 ms 8868 KB Output is correct
32 Correct 30 ms 8908 KB Output is correct
33 Correct 36 ms 9164 KB Output is correct
34 Correct 27 ms 9248 KB Output is correct
35 Correct 29 ms 9172 KB Output is correct
36 Correct 35 ms 9164 KB Output is correct
37 Correct 34 ms 8780 KB Output is correct
38 Correct 3 ms 6548 KB Output is correct
39 Correct 3 ms 6596 KB Output is correct
40 Correct 4 ms 6712 KB Output is correct
41 Correct 3 ms 6736 KB Output is correct
42 Correct 4 ms 6740 KB Output is correct
43 Correct 4 ms 6728 KB Output is correct
44 Correct 4 ms 6740 KB Output is correct
45 Correct 4 ms 6740 KB Output is correct
46 Correct 4 ms 6728 KB Output is correct
47 Correct 83 ms 26496 KB Output is correct
48 Correct 74 ms 25720 KB Output is correct
49 Correct 92 ms 26484 KB Output is correct
50 Correct 81 ms 26444 KB Output is correct
51 Correct 85 ms 26484 KB Output is correct
52 Correct 94 ms 26496 KB Output is correct
53 Correct 66 ms 25868 KB Output is correct
54 Correct 133 ms 25120 KB Output is correct
55 Correct 113 ms 25140 KB Output is correct
56 Correct 115 ms 25048 KB Output is correct
57 Correct 120 ms 28676 KB Output is correct
58 Correct 161 ms 28608 KB Output is correct
59 Correct 158 ms 28400 KB Output is correct
60 Correct 154 ms 28288 KB Output is correct
61 Correct 145 ms 28616 KB Output is correct
62 Correct 75 ms 26508 KB Output is correct
63 Correct 123 ms 27964 KB Output is correct
64 Correct 120 ms 27788 KB Output is correct
65 Correct 137 ms 27976 KB Output is correct
66 Correct 4 ms 6588 KB Output is correct
67 Correct 109 ms 28308 KB Output is correct
68 Correct 118 ms 28264 KB Output is correct
69 Correct 131 ms 28264 KB Output is correct
70 Correct 110 ms 28228 KB Output is correct
71 Correct 126 ms 28272 KB Output is correct
72 Correct 114 ms 28344 KB Output is correct
73 Correct 104 ms 28664 KB Output is correct
74 Correct 108 ms 28696 KB Output is correct
75 Correct 148 ms 28544 KB Output is correct
76 Correct 132 ms 28664 KB Output is correct
77 Correct 99 ms 27924 KB Output is correct
78 Correct 3 ms 6484 KB Output is correct
79 Correct 4 ms 6756 KB Output is correct
80 Correct 4 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 3 ms 6740 KB Output is correct
85 Correct 3 ms 6740 KB Output is correct
86 Correct 34 ms 8936 KB Output is correct
87 Correct 42 ms 8908 KB Output is correct
88 Correct 39 ms 9248 KB Output is correct
89 Correct 32 ms 9280 KB Output is correct
90 Correct 28 ms 9160 KB Output is correct
91 Correct 27 ms 9164 KB Output is correct
92 Correct 29 ms 8712 KB Output is correct
93 Correct 85 ms 26736 KB Output is correct
94 Correct 83 ms 25724 KB Output is correct
95 Correct 90 ms 26300 KB Output is correct
96 Correct 79 ms 26496 KB Output is correct
97 Correct 76 ms 26480 KB Output is correct
98 Correct 93 ms 26500 KB Output is correct
99 Correct 74 ms 25796 KB Output is correct
100 Correct 151 ms 28416 KB Output is correct
101 Correct 143 ms 28440 KB Output is correct
102 Correct 134 ms 28568 KB Output is correct
103 Correct 112 ms 27976 KB Output is correct
104 Correct 117 ms 27788 KB Output is correct
105 Correct 119 ms 28016 KB Output is correct
106 Correct 144 ms 27664 KB Output is correct
107 Correct 176 ms 27680 KB Output is correct
108 Correct 144 ms 28272 KB Output is correct
109 Correct 120 ms 28316 KB Output is correct
110 Correct 154 ms 28280 KB Output is correct
111 Correct 149 ms 28336 KB Output is correct