oj.uz

답안 #834592

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
834592 2023-08-22T15:41:20 Z kwongweng Passport (JOI23_passport) C++17
100 / 100
 825 ms 19956 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef pair<int, int> ii;
typedef vector<ii> vii;
typedef long double ld;
typedef pair<ll, ll> pll;
#define FOR(i, a, b) for(int i = a; i < b; i++)
#define ROF(i, a, b) for(int i = a; i >= b; i--)
#define ms memset
#define pb push_back
#define fi first
#define se second

struct segtree{
  int sz; vi mx; vi a;
  void build(int v, int tl, int tr){
    if (tl==tr) {mx[v]=tl; return;}
    int tm=(tl+tr)/2;
    build(2*v,tl,tm); build(2*v+1,tm+1,tr);
    if (a[mx[2*v]] >= a[mx[2*v+1]]) mx[v]=mx[2*v];
    else mx[v]=mx[2*v+1];
  }
  void init(int n, vi A){
    sz=n; mx.assign(4*n,-1); a=A; build(1,0,n-1);
  }
  void rem(int v, int tl, int tr, int pos){
    if (tl==tr){mx[v]=-1; return;}
    int tm=(tl+tr)/2;
    if (pos<=tm) rem(2*v,tl,tm,pos);
    else rem(2*v+1,tm+1,tr,pos);
    if (mx[2*v] != -1 && mx[2*v+1] != -1){
      if (a[mx[2*v]] >= a[mx[2*v+1]]) mx[v]=mx[2*v];
      else mx[v]=mx[2*v+1];
    }else{
      if (mx[2*v]==-1) mx[v]=mx[2*v+1];
      else mx[v]=mx[2*v];
    }
  }
  void rem(int pos){rem(1,0,sz-1,pos);}
  int qry(int v, int tl, int tr, int l, int r){
    if (tl==l && tr==r) return mx[v];
    if (l>r) return -1;
    int tm=(tl+tr)/2;
    int L=qry(2*v,tl,tm,l,min(r,tm)), R=qry(2*v+1,tm+1,tr,max(l,tm+1),r);
    if (L==-1) return R;
    if (R==-1) return L;
    if (a[L]>=a[R]) return L;
    return R;
  }
  int qry(int l, int r){return qry(1,0,sz-1,l,r);}
};

void solve(){
  int n; cin>>n;
  vi l(n+1), r(n+1);
  FOR(i,1,n+1) cin>>l[i]>>r[i];
  FOR(i,1,n+1) l[i]=n-l[i];
  segtree stl, str;
  stl.init(n+1,l); str.init(n+1,r);
  vi d1(n+1,n+2); queue<int> bfs; 
  d1[1]=0; stl.rem(1); str.rem(1); bfs.push(1);
  while (!bfs.empty()){
    int u = bfs.front(); bfs.pop();
    int val = str.qry(1,u);
    while (val != -1 && r[val] >= u){
      stl.rem(val); str.rem(val); bfs.push(val); d1[val]=d1[u]+1;
      //cout<<u<<" "<<d1[u]<<" "<<val<<" "<<d1[val]<<"\n";
      val=str.qry(1,u);
    }
    val = stl.qry(u,n);
    while (val!=-1 && l[val] >= n-u){
      stl.rem(val); str.rem(val); bfs.push(val); d1[val]=d1[u]+1;
      //cout<<u<<" "<<d1[u]<<" "<<val<<" "<<d1[val]<<"\n";
      val=stl.qry(u,n);
    }
  }
  //FOR(i,1,n+1) cout<<d1[i]<<" "; cout<<"\n";

  vi dn(n+1,n+2);
  stl.init(n+1,l); str.init(n+1,r);
  dn[n]=0; stl.rem(n); str.rem(n); bfs.push(n);
  while (!bfs.empty()){
    int u = bfs.front(); bfs.pop();
    int val = str.qry(1,u);
    while (val != -1 && r[val] >= u){
      stl.rem(val); str.rem(val); bfs.push(val); dn[val]=dn[u]+1;
      val=str.qry(1,u);
    }
    val = stl.qry(u,n);
    while (val!=-1 && l[val] >= n-u){
      stl.rem(val); str.rem(val); bfs.push(val); dn[val]=dn[u]+1;
      val=stl.qry(u,n);
    }
  }
  //FOR(i,1,n+1) cout<<dn[i]<<" "; cout<<"\n";
  
  vi ans(n+1); FOR(i,1,n+1) ans[i]=d1[i]+dn[i]-1; ans[1]++; ans[n]++;
  int mn=ans[1]; FOR(i,2,n+1) mn=min(mn,ans[1]);
  stl.init(n+1,l); str.init(n+1,r);
  priority_queue<ii,vii,greater<ii>> pq;
  FOR(i,1,n+1){
    if (ans[i]<=n) pq.push({ans[i],i});
  }
  while (!pq.empty()){
    ii node = pq.top(); pq.pop();
    int u = node.se;
    if (ans[u] != node.fi) continue;
    int val = str.qry(1,u);
    while (val != -1 && r[val] >= u){
      stl.rem(val); str.rem(val); bfs.push(val);
      if (ans[val] > ans[u]+1){
        ans[val]=ans[u]+1; pq.push({ans[val],val});
      }
      val=str.qry(1,u);
    }
    val = stl.qry(u,n);
    while (val!=-1 && l[val] >= n-u){
      stl.rem(val); str.rem(val); bfs.push(val);
      if (ans[val] > ans[u]+1){
        ans[val]=ans[u]+1; pq.push({ans[val],val});
      }
      val=stl.qry(u,n);
    }
  }
  
  int q; cin>>q;
  while(q--){
    int x; cin>>x; 
    if (ans[x]>n) ans[x]=-1;
    cout<<ans[x]<<"\n";
  }
  
}

int main(){
	//MOD=MOD1;
    ios::sync_with_stdio(false);
    if (fopen("input.txt", "r")) {
		  freopen("input.txt", "r", stdin);
    	freopen("output.txt", "w", stdout);
	  }
    int TC = 1;
    //cin >> TC; 
    FOR(i, 1, TC+1){
        //cout << "Case #" << i << ": ";
        solve();
    }
	
	return 0;
}

Compilation message

passport.cpp: In function 'int main()':
passport.cpp:141:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  141 |     freopen("input.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
passport.cpp:142:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  142 |      freopen("output.txt", "w", stdout);
      |      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
6.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 569 ms 15384 KB Output is correct
5 Correct 470 ms 15032 KB Output is correct
6 Correct 403 ms 15064 KB Output is correct
7 Correct 323 ms 15312 KB Output is correct
8 Correct 100 ms 10376 KB Output is correct

Subtask #2
16.0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 320 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 320 KB Output is correct
14 Correct 1 ms 316 KB Output is correct
15 Correct 1 ms 340 KB Output is correct

Subtask #3
24.0 / 24.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 320 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 320 KB Output is correct
14 Correct 1 ms 316 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 5 ms 472 KB Output is correct
17 Correct 5 ms 500 KB Output is correct
18 Correct 5 ms 468 KB Output is correct
19 Correct 4 ms 468 KB Output is correct
20 Correct 4 ms 468 KB Output is correct
21 Correct 3 ms 468 KB Output is correct
22 Correct 2 ms 468 KB Output is correct
23 Correct 4 ms 468 KB Output is correct
24 Correct 3 ms 468 KB Output is correct

Subtask #4
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 320 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 320 KB Output is correct
14 Correct 1 ms 316 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 5 ms 472 KB Output is correct
17 Correct 5 ms 500 KB Output is correct
18 Correct 5 ms 468 KB Output is correct
19 Correct 4 ms 468 KB Output is correct
20 Correct 4 ms 468 KB Output is correct
21 Correct 3 ms 468 KB Output is correct
22 Correct 2 ms 468 KB Output is correct
23 Correct 4 ms 468 KB Output is correct
24 Correct 3 ms 468 KB Output is correct
25 Correct 0 ms 212 KB Output is correct
26 Correct 0 ms 212 KB Output is correct
27 Correct 8 ms 460 KB Output is correct
28 Correct 8 ms 508 KB Output is correct
29 Correct 7 ms 508 KB Output is correct
30 Correct 6 ms 468 KB Output is correct
31 Correct 7 ms 468 KB Output is correct

Subtask #5
46.0 / 46.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 569 ms 15384 KB Output is correct
5 Correct 470 ms 15032 KB Output is correct
6 Correct 403 ms 15064 KB Output is correct
7 Correct 323 ms 15312 KB Output is correct
8 Correct 100 ms 10376 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 320 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 0 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 0 ms 212 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 1 ms 320 KB Output is correct
22 Correct 1 ms 316 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 5 ms 472 KB Output is correct
25 Correct 5 ms 500 KB Output is correct
26 Correct 5 ms 468 KB Output is correct
27 Correct 4 ms 468 KB Output is correct
28 Correct 4 ms 468 KB Output is correct
29 Correct 3 ms 468 KB Output is correct
30 Correct 2 ms 468 KB Output is correct
31 Correct 4 ms 468 KB Output is correct
32 Correct 3 ms 468 KB Output is correct
33 Correct 0 ms 212 KB Output is correct
34 Correct 0 ms 212 KB Output is correct
35 Correct 8 ms 460 KB Output is correct
36 Correct 8 ms 508 KB Output is correct
37 Correct 7 ms 508 KB Output is correct
38 Correct 6 ms 468 KB Output is correct
39 Correct 7 ms 468 KB Output is correct
40 Correct 825 ms 19512 KB Output is correct
41 Correct 695 ms 19532 KB Output is correct
42 Correct 667 ms 19348 KB Output is correct
43 Correct 638 ms 19304 KB Output is correct
44 Correct 634 ms 19956 KB Output is correct
45 Correct 523 ms 17736 KB Output is correct
46 Correct 250 ms 7244 KB Output is correct
47 Correct 638 ms 18744 KB Output is correct
48 Correct 523 ms 18264 KB Output is correct