Submission #973662

#	Time	Username	Problem	Language	Result	Execution time	Memory
973662		vjudge1	Passport (JOI23_passport)	C++17	6 / 100	93 ms	22668 KiB

passport

#include <time.h>
#include <cstdlib>
#include <stack>
#include <numeric>
#include <unordered_map>
#include <unordered_set>
#include <iomanip>
#include <map>
#include <set>
#include <iterator>
#include <deque>
#include <queue>
#include <sstream>
#include <array>
#include <string>
#include <tuple>
#include <chrono>
#include <cassert>
#include <cstdio>
#include <cstring>
#include <list>
#include <iostream>
#include <vector>
#include <cmath>
#include <algorithm>
#include <bitset>

using namespace std;

int tt = 1, n;
int a[200005], lf[200005], rg[200005];

int dp[200005];
vector<int> g1[200005], g2[200005];
int main(){
    ios::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    cin >> n;
    for(int i = 1; i <= n; i++){
        cin >> lf[i] >> rg[i];
    }
    cin >> tt;
    while(tt--){
        int x;
        cin >> x;
        bool ok = 0;
        set<pair<int, int>> st1, st2;
        for(int i = 1; i <= n; i++){
            dp[i] = 1e9;
            g1[i].clear();
            g2[i].clear();
        }
        dp[x] = 0;
        int l = x, r = x, pos = x;
        st1.insert({dp[x], x});
        st2.insert({dp[x], x});
        g1[lf[x]].push_back(x);
        g2[rg[x]].push_back(x);
        int mn1 = l, mx1 = r;
        if(lf[x] == x) st1.erase({dp[x], x});
        if(rg[x] == x) st2.erase({dp[x], x});
        g1[x].clear();
        g2[x].clear();
        int l1 = lf[x], r1 = rg[x];
        while(l > 1 || r < n){
            bool f1 = 0, f2 = 0;
            int dop1 = 1e9, dop2 = 0;
            if(l != l1){
                f1 = 1;
                for(int i = l - 1; i >= l1; i--){
                    dp[i] = st1.begin()->first + 1;
                    for(int to : g1[i])
                        st1.erase({dp[to], to});
                    g1[i].clear();
                    if(lf[i] != i){
                        st1.insert({dp[i], i});
                        g1[lf[i]].push_back(i);
                    }
                    if(rg[i] > r1){
                        st2.insert({dp[i], i});
                        g2[rg[i]].push_back(i);
                    }
                    dop1 = min(dop1, lf[i]);
                    dop2 = max(dop2, rg[i]);
                }
            }
            if(r != r1){
                f2 = 1;
                for(int i = r + 1; i <= r1; i++){
                    dp[i] = st2.begin()->first + 1;
                    for(int to : g2[i])
                        st2.erase({dp[to], to});
                    g2[i].clear();
                    if(rg[i] != i){
                        st2.insert({dp[i], i});
                        g2[rg[i]].push_back(i);
                    }
                    if(lf[i] < l1){
                        st1.insert({dp[i], i});
                        g1[lf[i]].push_back(i);
                    }
                    dop2 = max(dop2, rg[i]);
                    dop1 = min(dop1, lf[i]);
                }
            }
            if(!f1 && !f2){
                ok = 1;
                break;
            }
            l = l1, r = r1;
            l1 = min(dop1, l1), r1 = max(dop2, r1);
        }
        if(ok){
            cout << -1 << "\n";
            continue;
        }
        int ans = 0;
        for(int i = 1; i <= n; i++) ans = max(ans, dp[i]);
        cout << ans << "\n";
    }
}

Compilation message (stderr)

passport.cpp: In function 'int main()':
passport.cpp:54:27: warning: unused variable 'pos' [-Wunused-variable]
   54 |         int l = x, r = x, pos = x;
      |                           ^~~
passport.cpp:59:13: warning: unused variable 'mn1' [-Wunused-variable]
   59 |         int mn1 = l, mx1 = r;
      |             ^~~
passport.cpp:59:22: warning: unused variable 'mx1' [-Wunused-variable]
   59 |         int mn1 = l, mx1 = r;
      |                      ^~~

• Subtask 1: 6 / 6
• Subtask 2: 0 / 16
• Subtask 3: 0 / 24
• Subtask 4: 0 / 8
• Subtask 5: 0 / 46