Submission #888660

#	Time	Username	Problem	Language	Result	Execution time	Memory
888660		vjudge1	Passport (JOI23_passport)	C++17	0 / 100	566 ms	1048576 KiB

passport

#include <bits/stdc++.h>

using namespace std;

#define all(x) x.begin(), x.end()
#define ar array
#define pb push_back
#define ln '\n'
#define int long long

using i64 = long long;

template <class F, class _S>
bool chmin(F &u, const _S &v){
    bool flag = false;
    if ( u > v ){
        u = v; flag |= true;
    }
    return flag;
}

template <class F, class _S>
bool chmax(F &u, const _S &v){
    bool flag = false;
    if ( u < v ){
        u = v; flag |= true;
    }
    return flag;
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int n; cin >> n;
    vector <int> L(n), R(n);
    for ( int i = 0; i < n; i++ ){
        cin >> L[i] >> R[i];
        --L[i], --R[i];
    }
    int qq, s; cin >> qq >> s;
    assert(qq == 1);
    --s;
    const int inf = 1e15;
    vector <vector<int>> dp(n, vector <int> (n, -1));
    dp[L[s]][R[s]] = 1;
    auto dfs = [&](auto dfs, int l, int r) -> int{
        if ( l > r ){
            return inf;
        }
        int &ret = dp[l][r];
        if ( dp[l][r] != -1 ){
            return ret;
        } ret = inf;
        for ( int i = l; i <= r; i++ ){
            bool ok = false, fl = false;
            for ( int j = i; j <= r; j++ ){
                if ( R[j] >= r ) ok = true;
                if ( L[j] <= l ) fl = true;
                if ( (ok & fl) && (i != l || j != r) ){
                    auto flag = chmin(ret, dfs(dfs, i, j) + 1);
                }
            }
        }
        return ret;
    };
    int ans = dfs(dfs, 0, n - 1);
    if ( ans == inf ){
        ans = -1;
    }
    cout << ans;

    cout << '\n';
}

Compilation message (stderr)

passport.cpp: In instantiation of 'main()::<lambda(auto:23, long long int, long long int)> [with auto:23 = main()::<lambda(auto:23, long long int, long long int)>]':
passport.cpp:67:32:   required from here
passport.cpp:61:26: warning: unused variable 'flag' [-Wunused-variable]
   61 |                     auto flag = chmin(ret, dfs(dfs, i, j) + 1);
      |                          ^~~~

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