Submission #1260914

#	Time	Username	Problem	Language	Result	Execution time	Memory
1260914		patgra	Passport (JOI23_passport)	C++20	0 / 100	0 ms	324 KiB

passport

#include <bits/stdc++.h>

#define rep(a,b,c) for(auto a = (b); a != (c); a++)
#define repD(a,b,c) for(auto a = (b); a != (c); a--)
#define repIn(a, b) for(auto& a : (b))
#define repIn2(a, b, c) for(auto& [a, b] : (c))

constexpr bool dbg = 1;
#define DEBUG if constexpr(dbg)
#define DC DEBUG std::cerr
#define eol std::endl

#define ll long long
#define pb push_back

using namespace std;

int main() {
    ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
    int n;
    cin >> n;
    vector<pair<int, int>> v(n);
    rep(i, 0, n) cin >> v[i].first >> v[i].second;
    int q;
    rep(i, 0, q) {
        int l, r;
        cin >> l;
        l--;
        r = l;
        if(l == 0) {
            int ans = 0;
            vector<int> maxPref;
            rep(i, 0, n) maxPref.pb(max(maxPref.size() ? maxPref.back() : 0, v[i].second));
            while(r != n - 1 && r < maxPref[r]) {
                ans++;
                r = maxPref[r];
            }
            if(r != n - 1) ans = -1;
            cout << ans << '\n';
        }
    }
}

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