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Submission #622274

# Submission time Handle Problem Language Result Execution time Memory
622274 2022-08-04T05:37:19 Z rrrr10000 Event Hopping (BOI22_events) C++14
100 / 100
 521 ms 30372 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll,ll> P;
typedef vector<ll> vi;
typedef vector<vi> vvi;
typedef vector<P> vp;
typedef vector<vp> vvp;
typedef vector<bool> vb;
#define rep(i,n) for(ll i=0;i<(ll)(n);i++)
#define REP(i,k,n) for(ll i=(ll)(k);i<(ll)(n);i++)
#define all(a) a.begin(),a.end()
#define lb(v,k) (lower_bound(all(v),k)-v.begin())
#define fi first
#define se second
#define pb emplace_back
#define dupli(a) {sort(all(a));a.erase(unique(all(a)),a.end());}
template<class T> void out(T a){cout<<a<<endl;}
template<class T> void outv(T v){rep(i,v.size()){if(i)cout<<' ';cout<<v[i];}cout<<endl;}
template<class T> bool chmin(T&a,T b){if(a>b){a=b;return true;}return false;}
template<class T> bool chmax(T&a,T b){if(a<b){a=b;return true;}return false;}
const ll inf=1001001001001001001;
int main(){
    ll n,q;cin>>n>>q;
    vp v;
    vi sx;
    rep(i,n){
        ll a,b;cin>>a>>b;
        v.pb(a,b);
        sx.pb(a);sx.pb(b);
    }
    dupli(sx);
    rep(i,n)v[i].fi=lb(sx,v[i].fi);
    rep(i,n)v[i].se=lb(sx,v[i].se);
    ll N=sx.size();
    vp seg(N*2,P(inf,-1));
    rep(t,n){
        for(ll i=v[t].se+N;i>0;i>>=1)chmin(seg[i],P(v[t].fi,t));
    }
    vvi table(20,vi(n,-1));
    rep(i,n){
        P mi(inf,-1);
        for(ll l=v[i].fi+N,r=v[i].se+1+N;l<r;l>>=1,r>>=1){
            if(l&1)chmin(mi,seg[l++]);
            if(r&1)chmin(mi,seg[--r]);
        }
        if(v[mi.se].fi<v[i].fi)table[0][i]=mi.se;
    }
    rep(i,19)rep(j,n)if(table[i][j]!=-1)table[i+1][j]=table[i][table[i][j]];
    rep(qq,q){
        ll s,t;cin>>s>>t;s--;t--;
        if(s==t){
            out(0);continue;
        }
        ll ans=0;
        for(ll j=19;j>=0;j--)if(table[j][t]!=-1&&v[s].se<v[table[j][t]].fi){
            ans+=1<<j;
            t=table[j][t];
        }
        if(v[t].se<v[s].se)ans=-1;
        else if(v[t].fi>v[s].se){
            if(table[0][t]==-1)ans=-1;
            else ans++;
        }
        if(ans==-1)out("impossible");
        else out(ans+1);
    }
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 328 ms 26632 KB Output is correct
3 Correct 370 ms 26660 KB Output is correct
4 Correct 464 ms 26588 KB Output is correct
5 Correct 381 ms 26964 KB Output is correct
6 Correct 392 ms 27376 KB Output is correct
7 Correct 338 ms 27396 KB Output is correct
8 Correct 372 ms 30212 KB Output is correct
9 Correct 335 ms 30224 KB Output is correct
10 Correct 403 ms 27068 KB Output is correct
11 Correct 400 ms 28440 KB Output is correct
12 Correct 314 ms 26408 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 292 KB Output is correct
3 Correct 2 ms 468 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 2 ms 468 KB Output is correct
6 Correct 2 ms 468 KB Output is correct
7 Correct 3 ms 596 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 2 ms 468 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 292 KB Output is correct
3 Correct 2 ms 468 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 2 ms 468 KB Output is correct
6 Correct 2 ms 468 KB Output is correct
7 Correct 3 ms 596 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 2 ms 468 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 300 KB Output is correct
12 Correct 2 ms 468 KB Output is correct
13 Correct 2 ms 468 KB Output is correct
14 Correct 2 ms 468 KB Output is correct
15 Correct 2 ms 468 KB Output is correct
16 Correct 2 ms 468 KB Output is correct
17 Correct 3 ms 468 KB Output is correct
18 Correct 2 ms 440 KB Output is correct
19 Correct 198 ms 2972 KB Output is correct
20 Correct 205 ms 3148 KB Output is correct
21 Correct 207 ms 3160 KB Output is correct
22 Correct 197 ms 3328 KB Output is correct
23 Correct 203 ms 3268 KB Output is correct
24 Correct 253 ms 3272 KB Output is correct
25 Correct 196 ms 2944 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 292 KB Output is correct
3 Correct 2 ms 468 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 2 ms 468 KB Output is correct
6 Correct 2 ms 468 KB Output is correct
7 Correct 3 ms 596 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 2 ms 468 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 300 KB Output is correct
12 Correct 3 ms 468 KB Output is correct
13 Correct 2 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 2 ms 440 KB Output is correct
16 Correct 2 ms 500 KB Output is correct
17 Correct 2 ms 468 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 133 ms 24932 KB Output is correct
20 Correct 120 ms 24088 KB Output is correct
21 Correct 148 ms 24896 KB Output is correct
22 Correct 147 ms 26072 KB Output is correct
23 Correct 154 ms 28072 KB Output is correct
24 Correct 177 ms 28004 KB Output is correct
25 Correct 75 ms 21048 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 331 ms 26704 KB Output is correct
2 Correct 364 ms 26744 KB Output is correct
3 Correct 413 ms 26452 KB Output is correct
4 Correct 374 ms 30044 KB Output is correct
5 Correct 421 ms 26820 KB Output is correct
6 Correct 448 ms 29860 KB Output is correct
7 Correct 424 ms 29836 KB Output is correct
8 Correct 370 ms 30108 KB Output is correct
9 Correct 151 ms 27992 KB Output is correct
10 Correct 360 ms 29644 KB Output is correct
11 Correct 521 ms 29308 KB Output is correct
12 Correct 358 ms 29632 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 328 ms 26632 KB Output is correct
3 Correct 370 ms 26660 KB Output is correct
4 Correct 464 ms 26588 KB Output is correct
5 Correct 381 ms 26964 KB Output is correct
6 Correct 392 ms 27376 KB Output is correct
7 Correct 338 ms 27396 KB Output is correct
8 Correct 372 ms 30212 KB Output is correct
9 Correct 335 ms 30224 KB Output is correct
10 Correct 403 ms 27068 KB Output is correct
11 Correct 400 ms 28440 KB Output is correct
12 Correct 314 ms 26408 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 292 KB Output is correct
15 Correct 2 ms 468 KB Output is correct
16 Correct 2 ms 468 KB Output is correct
17 Correct 2 ms 468 KB Output is correct
18 Correct 2 ms 468 KB Output is correct
19 Correct 3 ms 596 KB Output is correct
20 Correct 2 ms 468 KB Output is correct
21 Correct 2 ms 468 KB Output is correct
22 Correct 1 ms 212 KB Output is correct
23 Correct 1 ms 300 KB Output is correct
24 Correct 2 ms 468 KB Output is correct
25 Correct 2 ms 468 KB Output is correct
26 Correct 2 ms 468 KB Output is correct
27 Correct 2 ms 468 KB Output is correct
28 Correct 2 ms 468 KB Output is correct
29 Correct 3 ms 468 KB Output is correct
30 Correct 2 ms 440 KB Output is correct
31 Correct 198 ms 2972 KB Output is correct
32 Correct 205 ms 3148 KB Output is correct
33 Correct 207 ms 3160 KB Output is correct
34 Correct 197 ms 3328 KB Output is correct
35 Correct 203 ms 3268 KB Output is correct
36 Correct 253 ms 3272 KB Output is correct
37 Correct 196 ms 2944 KB Output is correct
38 Correct 0 ms 212 KB Output is correct
39 Correct 1 ms 300 KB Output is correct
40 Correct 3 ms 468 KB Output is correct
41 Correct 2 ms 468 KB Output is correct
42 Correct 1 ms 468 KB Output is correct
43 Correct 2 ms 440 KB Output is correct
44 Correct 2 ms 500 KB Output is correct
45 Correct 2 ms 468 KB Output is correct
46 Correct 1 ms 468 KB Output is correct
47 Correct 133 ms 24932 KB Output is correct
48 Correct 120 ms 24088 KB Output is correct
49 Correct 148 ms 24896 KB Output is correct
50 Correct 147 ms 26072 KB Output is correct
51 Correct 154 ms 28072 KB Output is correct
52 Correct 177 ms 28004 KB Output is correct
53 Correct 75 ms 21048 KB Output is correct
54 Correct 331 ms 26704 KB Output is correct
55 Correct 364 ms 26744 KB Output is correct
56 Correct 413 ms 26452 KB Output is correct
57 Correct 374 ms 30044 KB Output is correct
58 Correct 421 ms 26820 KB Output is correct
59 Correct 448 ms 29860 KB Output is correct
60 Correct 424 ms 29836 KB Output is correct
61 Correct 370 ms 30108 KB Output is correct
62 Correct 151 ms 27992 KB Output is correct
63 Correct 360 ms 29644 KB Output is correct
64 Correct 521 ms 29308 KB Output is correct
65 Correct 358 ms 29632 KB Output is correct
66 Correct 1 ms 212 KB Output is correct
67 Correct 333 ms 26624 KB Output is correct
68 Correct 357 ms 26712 KB Output is correct
69 Correct 414 ms 26700 KB Output is correct
70 Correct 343 ms 27044 KB Output is correct
71 Correct 369 ms 27268 KB Output is correct
72 Correct 359 ms 27452 KB Output is correct
73 Correct 353 ms 30372 KB Output is correct
74 Correct 350 ms 30272 KB Output is correct
75 Correct 447 ms 27132 KB Output is correct
76 Correct 406 ms 28400 KB Output is correct
77 Correct 277 ms 26348 KB Output is correct
78 Correct 0 ms 212 KB Output is correct
79 Correct 2 ms 436 KB Output is correct
80 Correct 2 ms 468 KB Output is correct
81 Correct 2 ms 468 KB Output is correct
82 Correct 2 ms 468 KB Output is correct
83 Correct 2 ms 468 KB Output is correct
84 Correct 2 ms 468 KB Output is correct
85 Correct 1 ms 468 KB Output is correct
86 Correct 191 ms 2992 KB Output is correct
87 Correct 207 ms 2972 KB Output is correct
88 Correct 227 ms 3204 KB Output is correct
89 Correct 185 ms 3284 KB Output is correct
90 Correct 204 ms 3304 KB Output is correct
91 Correct 207 ms 3212 KB Output is correct
92 Correct 202 ms 3056 KB Output is correct
93 Correct 139 ms 24984 KB Output is correct
94 Correct 113 ms 24124 KB Output is correct
95 Correct 142 ms 24860 KB Output is correct
96 Correct 163 ms 26096 KB Output is correct
97 Correct 153 ms 28068 KB Output is correct
98 Correct 155 ms 27988 KB Output is correct
99 Correct 67 ms 21060 KB Output is correct
100 Correct 420 ms 29932 KB Output is correct
101 Correct 399 ms 29932 KB Output is correct
102 Correct 435 ms 29988 KB Output is correct
103 Correct 355 ms 29568 KB Output is correct
104 Correct 420 ms 29396 KB Output is correct
105 Correct 349 ms 29620 KB Output is correct
106 Correct 367 ms 25284 KB Output is correct
107 Correct 452 ms 26096 KB Output is correct
108 Correct 378 ms 26824 KB Output is correct
109 Correct 369 ms 26780 KB Output is correct
110 Correct 411 ms 29956 KB Output is correct
111 Correct 387 ms 29832 KB Output is correct