Submission #1250862

#	Time	Username	Problem	Language	Result	Execution time	Memory
1250862		Bui_Quoc_Cuong	Gift Exchange (JOI24_ho_t4)	C++20	50 / 100	2569 ms	4180 KiB

Main

# include <bits/stdc++.h>
using namespace std;

int ko() {
    cerr << "Time used: " << 1.0 * clock() / CLOCKS_PER_SEC << "s ";
    return 0;
}
#define all(a) a.begin(), a.end()
#define pb push_back
#define ff first
#define ss second
int n, q, a[500010], b[500010];

void solve() {
    cin >> n;
    for (int i = 0; i < n; i++) cin >> a[i];
    for (int i = 0; i < n; i++) cin >> b[i];
    cin >> q;
    while (q--) {
        vector<pair<int, int>> v, v2;
        int l, r;
        cin >> l >> r;
        --l;
        for (int i = l; i < r; ++i) v.pb({ b[i],i }), v2.pb({ a[i],i });
        sort(all(v)); sort(all(v2));
        bool flag = true;
        for (int i = 0; i < v.size(); ++i) {
            if (v[i].ss == v2[i].ss) {
                if (i && v2[i - 1].ff >= v[i].ff) swap(v[i - 1], v[i]);
                else if (i < v.size() - 1 && v2[i].ff >= v[i + 1].ff)  swap(v[i], v[i + 1]);
                else { flag = false; break; }
            }
        }
        for (int i = 0;i < v.size();i++) {
            if (v2[i].ff < v[i].ff) { flag = false; break; }
        }
        if (flag) cout << "Yes\n";
        else cout << "No\n";
    }
}

int main(void) {
    ios_base :: sync_with_stdio(0); cin.tie(0);
    #define taskname "kieuoanh"
    if (fopen(taskname".inp", "r")) {
        freopen(taskname".inp", "r", stdin); 
        freopen(taskname".out", "w", stdout);
    }   
    solve();
    return ko(), 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:46:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:47:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |         freopen(taskname".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 5 / 5
• Subtask 3: 10 / 10
• Subtask 4: 31 / 31
• Subtask 5: 0 / 8
• Subtask 6: 0 / 12
• Subtask 7: 0 / 18
• Subtask 8: 0 / 12