oj.uz

답안 #884026

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
884026 2023-12-06T14:35:32 Z mychecksedad Passport (JOI23_passport) C++17
0 / 100
 192 ms 59548 KB 
/* Author : Mychecksdead  */
#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define pb push_back
#define all(x) x.begin(), x.end()
#define en cout << '\n'
const int N = 2e5+100, M = 1e5+10, K = 21;


int n, A[N][K], B[N][K], T[4*N], ans[N];
map<int, int> dp[N];  
array<int, 2> a[N];

void build(){for(int i = 0; i <= 4*n; ++i) T[i] = MOD;}

void update(int l, int r, int p, int k, int val){
  if(l == r){
    T[k] = val;
    return;
  }
  int m = l+r>>1;
  if(p <= m)
    update(l, m, p, k<<1, val);
  else
    update(m+1, r, p, k<<1|1, val);
  T[k] = min(T[k<<1], T[k<<1|1]);
}
int get(int l, int r, int ql, int qr, int k){
  if(ql > r || l > qr) return MOD;
  if(ql <= l && r <= qr) return T[k];
  int m = l+r>>1;
  return min(get(l, m, ql, qr, k<<1), get(m+1, r, ql, qr, k<<1|1));
}


int get_max(int l, int r){
  int k = int(log2(r-l+1));
  return max(B[l][k], B[r-(1<<k)+1][k]);
}
int get_min(int l, int r){
  int k = int(log2(r-l+1));
  return min(A[l][k], A[r-(1<<k)+1][k]);
}


int dfs(int l, int r){
  if(dp[l].find(r) != dp[l].end()) return dp[l][r];
  dp[l][r] = MOD;
  int val = MOD;
  val = min(val, get(1, n, l, r, 1));
  if(val >= MOD){
    int L = get_min(l, r);
    int R = get_max(l, r);
    if(L < l) val = min(val, dfs(L, r) + 1);
    if(r < R) val = min(val, dfs(l, R) + 1);
  }
  // cout << l << ' ' << r << ' ' << val << '\n';
  return dp[l][r] = val;
}
void solve(){
  cin >> n;
  for(int i = 1; i <= n; ++i) cin >> a[i][0] >> a[i][1]; 

  for(int i = 1; i <= n; ++i) A[i][0] = a[i][0], B[i][0] = a[i][1];
  for(int j = 1; j < K; ++j){
    for(int i = 1; i + (1<<j) <= n+1; ++i){
      A[i][j] = min(A[i][j - 1], A[i + (1<<(j-1))][j - 1]);
      B[i][j] = max(B[i][j - 1], B[i + (1<<(j-1))][j - 1]);
    }
  }
  vector<int> Q;
  for(int i = 1; i <= n; ++i) Q.pb(i);
  sort(all(Q), [&](const int &x, const int &y){
    return (a[x][1] - a[x][0]) > (a[y][1] - a[y][0]);
  }); 
  build();
  dp[1][n] = 0;
  for(auto V: Q){
    int v = V;
    // cout << v << ":\n";
    int c = dfs(a[v][0], a[v][1]) + 1;
    ans[v] = c;
    update(1, n, v, 1, c);
  }
  int q; cin >> q;
  for(int i = 0; i < q; ++i){
    int v; cin >> v;
    cout << (ans[v] >= MOD ? -1 : ans[v]) << '\n';
  }
}
 
 
int main(){
  cin.tie(0); ios::sync_with_stdio(0);
  int tt = 1, aa;
  // freopen("in.txt", "r", stdin);
  // freopen("out.txt", "w", stdout);
  while(tt--){
    solve();
  }
  cerr<<"time taken : "<<(float)clock()/CLOCKS_PER_SEC<<" seconds\n";
  return 0;
}

Compilation message

passport.cpp: In function 'void update(int, int, int, int, int)':
passport.cpp:24:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   24 |   int m = l+r>>1;
      |           ~^~
passport.cpp: In function 'int get(int, int, int, int, int)':
passport.cpp:34:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   34 |   int m = l+r>>1;
      |           ~^~
passport.cpp: In function 'int main()':
passport.cpp:98:15: warning: unused variable 'aa' [-Wunused-variable]
   98 |   int tt = 1, aa;
      |               ^~

Subtask #1
0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 16728 KB Output is correct
2 Correct 3 ms 16728 KB Output is correct
3 Correct 3 ms 16868 KB Output is correct
4 Incorrect 192 ms 59548 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #2
0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 16728 KB Output is correct
2 Correct 3 ms 16732 KB Output is correct
3 Correct 3 ms 16868 KB Output is correct
4 Correct 3 ms 16732 KB Output is correct
5 Correct 3 ms 16732 KB Output is correct
6 Correct 3 ms 16984 KB Output is correct
7 Correct 3 ms 16832 KB Output is correct
8 Incorrect 2 ms 16732 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #3
0 / 24.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 16728 KB Output is correct
2 Correct 3 ms 16732 KB Output is correct
3 Correct 3 ms 16868 KB Output is correct
4 Correct 3 ms 16732 KB Output is correct
5 Correct 3 ms 16732 KB Output is correct
6 Correct 3 ms 16984 KB Output is correct
7 Correct 3 ms 16832 KB Output is correct
8 Incorrect 2 ms 16732 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #4
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 16728 KB Output is correct
2 Correct 3 ms 16732 KB Output is correct
3 Correct 3 ms 16868 KB Output is correct
4 Correct 3 ms 16732 KB Output is correct
5 Correct 3 ms 16732 KB Output is correct
6 Correct 3 ms 16984 KB Output is correct
7 Correct 3 ms 16832 KB Output is correct
8 Incorrect 2 ms 16732 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #5
0 / 46.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 16728 KB Output is correct
2 Correct 3 ms 16728 KB Output is correct
3 Correct 3 ms 16868 KB Output is correct
4 Incorrect 192 ms 59548 KB Output isn't correct
5 Halted 0 ms 0 KB -