oj.uz

Submission #329853

# Submission time Handle Problem Language Result Execution time Memory
329853 2020-11-22T23:19:54 Z milisav Port Facility (JOI17_port_facility) C++14
100 / 100
 4654 ms 354140 KB 
#include<bits/stdc++.h>
#define maxn 2500000
using namespace std;
int n;
int a[maxn];
int b[maxn];
int par[maxn];
int ord[maxn];
vector<int> c[maxn];
int d[maxn];
bool vis[maxn];
void dfs(int u) {
    vis[u]=true;
    for(auto v:c[u]) {
        if(!vis[v]) {
            d[v]=d[u]^1;
            dfs(v);
        }
    }
}
int act_c[4*maxn];
vector<int> cur_c;
set<int> st[maxn];
long long mod=1000000007;
int find_par(int u) {
    if(par[u]==u) return u;
    par[u]=find_par(par[u]);
    return par[u];
}
void print_par() {
    for(int i=1;i<=n;i++) {
        cerr<<"par["<<i<<"]="<<par[i]<<endl;
    }
}
void unite(int u,int v) {
    if(st[u].size()>st[v].size()) swap(u,v);
    par[u]=v;
    st[v].insert(st[u].begin(),st[u].end());
}
inline void clear(int id,int l,int r) {
    if(act_c[id]==0) return;
    if(l==r) {
        cur_c.push_back(-ord[l]);
        return;
    }
    act_c[id]=0;
    int m=(l+r)/2;
    clear(id*2+1,l,m);
    clear(id*2+2,m+1,r);
}
inline void active(int id,int l,int r,int x,int y) {
    if(x<=l && r<=y) {
        clear(id,l,r);
        return;
    }
    if(y<l || r<x) return;
    int m=(l+r)/2;
    active(id*2+1,l,m,x,y);
    active(id*2+2,m+1,r,x,y);
    act_c[id]=act_c[id*2+1]+act_c[id*2+2];
}
void update(int id,int l,int r,int p,int v) {
    if(l==r) {
        act_c[id]+=v;
        return;
    }
    int m=(l+r)/2;
    if(p<=m) update(id*2+1,l,m,p,v);
    else update(id*2+2,m+1,r,p,v);
    act_c[id]=act_c[id*2+1]+act_c[id*2+2];
}
stack<int> s[2];
int main() {
    scanf("%d",&n);
    for(int i=1;i<=n;i++) scanf("%d %d",&a[i],&b[i]);
    for(int i=1;i<=n;i++) {
        ord[a[i]]=i;
        ord[b[i]]=-i;
        par[i]=i;
        st[i].insert(b[i]);
    }
    //cerr<<"ok1"<<endl;
    for(int i=1;i<=2*n;i++) {
        //cerr<<i<<" "<<ord[i]<<endl;
        if(ord[i]>0) {
            int j=ord[i];
            cur_c.clear();
            active(0,1,2*n,a[j],b[j]);
            for(auto comp:cur_c) {
                int u=find_par(comp);
                int v=find_par(j);
                if(u!=v) {
                    c[j].push_back(comp);
                    c[comp].push_back(j);
                    unite(u,v);
                }
            }
            int u=find_par(j);
            update(0,1,2*n,(*st[u].begin()),1);
        }
        else {
            int j=-ord[i];
            //print_par();
            int u=find_par(j);
            //cerr<<j<<" "<<u<<" "<<pq[u].size()<<endl;
            update(0,1,2*n,(*st[u].begin()),-1);
            st[u].erase(st[u].begin());
            if(!st[u].empty()) update(0,1,2*n,(*st[u].begin()),1);
        }
        //cerr<<"ok2."<<i<<endl;
    }
    //cerr<<"ok2"<<endl;
    //print_par();
    long long ans=1;
    for(int i=1;i<=n;i++) {
        if(!vis[i]) {
            dfs(i);
            ans=(ans*2)%mod;
        }
    }
    for(int i=1;i<=2*n;i++) {
        if(ord[i]>0) {
            int j=ord[i];
            s[d[j]].push(j);
        }
        else {
            int j=-ord[i];
            if(s[d[j]].top()!=j) {
                printf("0");
                return 0;
            }
            s[d[j]].pop();
        }
    }
    printf("%lld",ans);
    return 0;
}

Compilation message

port_facility.cpp: In function 'int main()':
port_facility.cpp:74:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   74 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
port_facility.cpp:75:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   75 |     for(int i=1;i<=n;i++) scanf("%d %d",&a[i],&b[i]);
      |                           ~~~~~^~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 113 ms 176512 KB Output is correct
2 Correct 110 ms 176500 KB Output is correct
3 Correct 110 ms 176492 KB Output is correct
4 Correct 107 ms 176492 KB Output is correct
5 Correct 109 ms 176492 KB Output is correct
6 Correct 108 ms 176492 KB Output is correct
7 Correct 109 ms 176512 KB Output is correct
8 Correct 110 ms 176492 KB Output is correct
9 Correct 107 ms 176492 KB Output is correct
10 Correct 108 ms 176492 KB Output is correct
11 Correct 111 ms 176492 KB Output is correct
12 Correct 108 ms 176572 KB Output is correct
13 Correct 109 ms 176524 KB Output is correct
14 Correct 108 ms 176512 KB Output is correct
15 Correct 108 ms 176492 KB Output is correct
16 Correct 110 ms 176492 KB Output is correct
17 Correct 108 ms 176492 KB Output is correct
18 Correct 109 ms 176620 KB Output is correct
19 Correct 108 ms 176492 KB Output is correct
20 Correct 109 ms 176492 KB Output is correct
21 Correct 108 ms 176492 KB Output is correct
22 Correct 110 ms 176492 KB Output is correct
23 Correct 107 ms 176492 KB Output is correct
24 Correct 110 ms 176492 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 113 ms 176512 KB Output is correct
2 Correct 110 ms 176500 KB Output is correct
3 Correct 110 ms 176492 KB Output is correct
4 Correct 107 ms 176492 KB Output is correct
5 Correct 109 ms 176492 KB Output is correct
6 Correct 108 ms 176492 KB Output is correct
7 Correct 109 ms 176512 KB Output is correct
8 Correct 110 ms 176492 KB Output is correct
9 Correct 107 ms 176492 KB Output is correct
10 Correct 108 ms 176492 KB Output is correct
11 Correct 111 ms 176492 KB Output is correct
12 Correct 108 ms 176572 KB Output is correct
13 Correct 109 ms 176524 KB Output is correct
14 Correct 108 ms 176512 KB Output is correct
15 Correct 108 ms 176492 KB Output is correct
16 Correct 110 ms 176492 KB Output is correct
17 Correct 108 ms 176492 KB Output is correct
18 Correct 109 ms 176620 KB Output is correct
19 Correct 108 ms 176492 KB Output is correct
20 Correct 109 ms 176492 KB Output is correct
21 Correct 108 ms 176492 KB Output is correct
22 Correct 110 ms 176492 KB Output is correct
23 Correct 107 ms 176492 KB Output is correct
24 Correct 110 ms 176492 KB Output is correct
25 Correct 114 ms 176804 KB Output is correct
26 Correct 121 ms 176876 KB Output is correct
27 Correct 114 ms 176876 KB Output is correct
28 Correct 112 ms 176876 KB Output is correct
29 Correct 112 ms 176876 KB Output is correct
30 Correct 111 ms 176876 KB Output is correct
31 Correct 111 ms 176888 KB Output is correct
32 Correct 113 ms 176804 KB Output is correct
33 Correct 114 ms 176876 KB Output is correct
34 Correct 112 ms 176748 KB Output is correct
35 Correct 110 ms 176748 KB Output is correct
36 Correct 111 ms 176748 KB Output is correct
37 Correct 112 ms 177004 KB Output is correct
38 Correct 112 ms 176876 KB Output is correct
39 Correct 113 ms 176748 KB Output is correct
40 Correct 110 ms 176748 KB Output is correct
41 Correct 113 ms 176876 KB Output is correct
42 Correct 119 ms 176876 KB Output is correct
43 Correct 110 ms 176876 KB Output is correct
44 Correct 111 ms 176876 KB Output is correct

Subtask #3
56.0 / 56.0

# Verdict Execution time Memory Grader output
1 Correct 113 ms 176512 KB Output is correct
2 Correct 110 ms 176500 KB Output is correct
3 Correct 110 ms 176492 KB Output is correct
4 Correct 107 ms 176492 KB Output is correct
5 Correct 109 ms 176492 KB Output is correct
6 Correct 108 ms 176492 KB Output is correct
7 Correct 109 ms 176512 KB Output is correct
8 Correct 110 ms 176492 KB Output is correct
9 Correct 107 ms 176492 KB Output is correct
10 Correct 108 ms 176492 KB Output is correct
11 Correct 111 ms 176492 KB Output is correct
12 Correct 108 ms 176572 KB Output is correct
13 Correct 109 ms 176524 KB Output is correct
14 Correct 108 ms 176512 KB Output is correct
15 Correct 108 ms 176492 KB Output is correct
16 Correct 110 ms 176492 KB Output is correct
17 Correct 108 ms 176492 KB Output is correct
18 Correct 109 ms 176620 KB Output is correct
19 Correct 108 ms 176492 KB Output is correct
20 Correct 109 ms 176492 KB Output is correct
21 Correct 108 ms 176492 KB Output is correct
22 Correct 110 ms 176492 KB Output is correct
23 Correct 107 ms 176492 KB Output is correct
24 Correct 110 ms 176492 KB Output is correct
25 Correct 114 ms 176804 KB Output is correct
26 Correct 121 ms 176876 KB Output is correct
27 Correct 114 ms 176876 KB Output is correct
28 Correct 112 ms 176876 KB Output is correct
29 Correct 112 ms 176876 KB Output is correct
30 Correct 111 ms 176876 KB Output is correct
31 Correct 111 ms 176888 KB Output is correct
32 Correct 113 ms 176804 KB Output is correct
33 Correct 114 ms 176876 KB Output is correct
34 Correct 112 ms 176748 KB Output is correct
35 Correct 110 ms 176748 KB Output is correct
36 Correct 111 ms 176748 KB Output is correct
37 Correct 112 ms 177004 KB Output is correct
38 Correct 112 ms 176876 KB Output is correct
39 Correct 113 ms 176748 KB Output is correct
40 Correct 110 ms 176748 KB Output is correct
41 Correct 113 ms 176876 KB Output is correct
42 Correct 119 ms 176876 KB Output is correct
43 Correct 110 ms 176876 KB Output is correct
44 Correct 111 ms 176876 KB Output is correct
45 Correct 339 ms 192876 KB Output is correct
46 Correct 334 ms 193148 KB Output is correct
47 Correct 337 ms 192748 KB Output is correct
48 Correct 339 ms 193260 KB Output is correct
49 Correct 339 ms 192876 KB Output is correct
50 Correct 338 ms 193004 KB Output is correct
51 Correct 334 ms 193004 KB Output is correct
52 Correct 243 ms 186732 KB Output is correct
53 Correct 285 ms 186220 KB Output is correct
54 Correct 332 ms 195044 KB Output is correct
55 Correct 328 ms 193052 KB Output is correct
56 Correct 319 ms 193000 KB Output is correct
57 Correct 285 ms 188508 KB Output is correct
58 Correct 248 ms 186604 KB Output is correct
59 Correct 278 ms 187292 KB Output is correct
60 Correct 304 ms 188396 KB Output is correct
61 Correct 321 ms 190188 KB Output is correct
62 Correct 284 ms 188580 KB Output is correct
63 Correct 309 ms 189036 KB Output is correct
64 Correct 323 ms 190316 KB Output is correct
65 Correct 404 ms 192876 KB Output is correct
66 Correct 406 ms 192688 KB Output is correct
67 Correct 343 ms 193004 KB Output is correct
68 Correct 342 ms 192876 KB Output is correct
69 Correct 339 ms 193772 KB Output is correct
70 Correct 340 ms 193784 KB Output is correct
71 Correct 343 ms 195308 KB Output is correct
72 Correct 341 ms 195564 KB Output is correct
73 Correct 341 ms 195304 KB Output is correct
74 Correct 340 ms 195304 KB Output is correct
75 Correct 291 ms 193004 KB Output is correct
76 Correct 289 ms 192620 KB Output is correct
77 Correct 290 ms 193912 KB Output is correct
78 Correct 336 ms 193132 KB Output is correct
79 Correct 333 ms 192876 KB Output is correct

Subtask #4
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 113 ms 176512 KB Output is correct
2 Correct 110 ms 176500 KB Output is correct
3 Correct 110 ms 176492 KB Output is correct
4 Correct 107 ms 176492 KB Output is correct
5 Correct 109 ms 176492 KB Output is correct
6 Correct 108 ms 176492 KB Output is correct
7 Correct 109 ms 176512 KB Output is correct
8 Correct 110 ms 176492 KB Output is correct
9 Correct 107 ms 176492 KB Output is correct
10 Correct 108 ms 176492 KB Output is correct
11 Correct 111 ms 176492 KB Output is correct
12 Correct 108 ms 176572 KB Output is correct
13 Correct 109 ms 176524 KB Output is correct
14 Correct 108 ms 176512 KB Output is correct
15 Correct 108 ms 176492 KB Output is correct
16 Correct 110 ms 176492 KB Output is correct
17 Correct 108 ms 176492 KB Output is correct
18 Correct 109 ms 176620 KB Output is correct
19 Correct 108 ms 176492 KB Output is correct
20 Correct 109 ms 176492 KB Output is correct
21 Correct 108 ms 176492 KB Output is correct
22 Correct 110 ms 176492 KB Output is correct
23 Correct 107 ms 176492 KB Output is correct
24 Correct 110 ms 176492 KB Output is correct
25 Correct 114 ms 176804 KB Output is correct
26 Correct 121 ms 176876 KB Output is correct
27 Correct 114 ms 176876 KB Output is correct
28 Correct 112 ms 176876 KB Output is correct
29 Correct 112 ms 176876 KB Output is correct
30 Correct 111 ms 176876 KB Output is correct
31 Correct 111 ms 176888 KB Output is correct
32 Correct 113 ms 176804 KB Output is correct
33 Correct 114 ms 176876 KB Output is correct
34 Correct 112 ms 176748 KB Output is correct
35 Correct 110 ms 176748 KB Output is correct
36 Correct 111 ms 176748 KB Output is correct
37 Correct 112 ms 177004 KB Output is correct
38 Correct 112 ms 176876 KB Output is correct
39 Correct 113 ms 176748 KB Output is correct
40 Correct 110 ms 176748 KB Output is correct
41 Correct 113 ms 176876 KB Output is correct
42 Correct 119 ms 176876 KB Output is correct
43 Correct 110 ms 176876 KB Output is correct
44 Correct 111 ms 176876 KB Output is correct
45 Correct 339 ms 192876 KB Output is correct
46 Correct 334 ms 193148 KB Output is correct
47 Correct 337 ms 192748 KB Output is correct
48 Correct 339 ms 193260 KB Output is correct
49 Correct 339 ms 192876 KB Output is correct
50 Correct 338 ms 193004 KB Output is correct
51 Correct 334 ms 193004 KB Output is correct
52 Correct 243 ms 186732 KB Output is correct
53 Correct 285 ms 186220 KB Output is correct
54 Correct 332 ms 195044 KB Output is correct
55 Correct 328 ms 193052 KB Output is correct
56 Correct 319 ms 193000 KB Output is correct
57 Correct 285 ms 188508 KB Output is correct
58 Correct 248 ms 186604 KB Output is correct
59 Correct 278 ms 187292 KB Output is correct
60 Correct 304 ms 188396 KB Output is correct
61 Correct 321 ms 190188 KB Output is correct
62 Correct 284 ms 188580 KB Output is correct
63 Correct 309 ms 189036 KB Output is correct
64 Correct 323 ms 190316 KB Output is correct
65 Correct 404 ms 192876 KB Output is correct
66 Correct 406 ms 192688 KB Output is correct
67 Correct 343 ms 193004 KB Output is correct
68 Correct 342 ms 192876 KB Output is correct
69 Correct 339 ms 193772 KB Output is correct
70 Correct 340 ms 193784 KB Output is correct
71 Correct 343 ms 195308 KB Output is correct
72 Correct 341 ms 195564 KB Output is correct
73 Correct 341 ms 195304 KB Output is correct
74 Correct 340 ms 195304 KB Output is correct
75 Correct 291 ms 193004 KB Output is correct
76 Correct 289 ms 192620 KB Output is correct
77 Correct 290 ms 193912 KB Output is correct
78 Correct 336 ms 193132 KB Output is correct
79 Correct 333 ms 192876 KB Output is correct
80 Correct 2966 ms 329588 KB Output is correct
81 Correct 2969 ms 328960 KB Output is correct
82 Correct 2935 ms 327752 KB Output is correct
83 Correct 2959 ms 328200 KB Output is correct
84 Correct 2995 ms 329492 KB Output is correct
85 Correct 2911 ms 326836 KB Output is correct
86 Correct 2942 ms 328068 KB Output is correct
87 Correct 1913 ms 267744 KB Output is correct
88 Correct 2519 ms 263980 KB Output is correct
89 Correct 2898 ms 354140 KB Output is correct
90 Correct 2815 ms 328084 KB Output is correct
91 Correct 2886 ms 329748 KB Output is correct
92 Correct 2378 ms 284140 KB Output is correct
93 Correct 1941 ms 265708 KB Output is correct
94 Correct 2504 ms 271960 KB Output is correct
95 Correct 2788 ms 297560 KB Output is correct
96 Correct 2853 ms 309564 KB Output is correct
97 Correct 2486 ms 282720 KB Output is correct
98 Correct 2738 ms 298804 KB Output is correct
99 Correct 2840 ms 306020 KB Output is correct
100 Correct 4583 ms 326856 KB Output is correct
101 Correct 4654 ms 324772 KB Output is correct
102 Correct 3153 ms 326612 KB Output is correct
103 Correct 3190 ms 326660 KB Output is correct
104 Correct 3122 ms 337132 KB Output is correct
105 Correct 3132 ms 335452 KB Output is correct
106 Correct 3153 ms 352508 KB Output is correct
107 Correct 3139 ms 353156 KB Output is correct
108 Correct 3144 ms 352772 KB Output is correct
109 Correct 3141 ms 352408 KB Output is correct
110 Correct 2483 ms 345432 KB Output is correct
111 Correct 2501 ms 340844 KB Output is correct
112 Correct 2481 ms 332528 KB Output is correct
113 Correct 2917 ms 322220 KB Output is correct
114 Correct 2954 ms 326252 KB Output is correct