Submission #1293762

#	Time	Username	Problem	Language	Result	Execution time	Memory
1293762		lmaobruh	Long Mansion (JOI17_long_mansion)	C++20	0 / 100	3094 ms	3284 KiB

long_mansion

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define eb emplace_back
#define pb push_back
#define fi first
#define se second
#define ii pair<int,int>
#define ve vector
#define all(x) x.begin(), x.end()
#define fo(i,a,b) for (int i=(a),_b=(b); i<=_b; ++i)
#define fd(i,a,b) for (int i=(a),_b=(b); i>=_b; --i)
#define maxi(a, b) a = max(a, b)
#define mini(a, b) a = min(a, b)
#define _ << ' ' <<

const int N = 1e6+5, inf = 1e9+10, mod = 1e9+7;

/**

**/

bool MBE;

int l[N], r[N], c[N], n, q;
ve<int> pos[N];

bool bin(int l, int r, int x) {
    auto p=lower_bound(all(pos[x]),l);
    if (p==pos[x].end() || *p > r) return 0;
    return 1;
}

void sol() {
    cin >> n;
    fo(i,1,n-1) cin >> c[i];
    fo(i,1,n) {
        int sz, x; cin >> sz;
        while (sz--) {
            cin >> x;
            pos[x].pb(i);
        }
    }
    fo(i,1,n) {
        l[i]=r[i]=i;
        while (1) {
            if (l[i]>1&&bin(l[i],r[i],c[l[i]-1]))
                mini(l[i],l[i-1]);
            else if (r[i]<n&&bin(l[i],r[i],c[r[i]]))
                r[i]++;
            else break;
        }
    }
    cin >> q;
    while (q--) {
        int x, y; cin >> x >> y;
        cout << (l[x] <= y && y <= r[x] ? "YES\n" : "NO\n");
    }
}

bool MED;

signed main(){
    ios::sync_with_stdio(0); cin.tie(0);
    if(fopen("A.inp","r")) {
        freopen("A.inp","r",stdin);
        freopen("A.out","w",stdout);
    }
    int tc = 1; // cin >> tc;
    fo(i,1,tc) sol();
//    cerr << "MEM = " << abs(&MED-&MBE)/1024.0/1024.0 << " MB";
    return 0;
}

Compilation message (stderr)

long_mansion.cpp: In function 'int main()':
long_mansion.cpp:66:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |         freopen("A.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~
long_mansion.cpp:67:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |         freopen("A.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 15
• Subtask 4: 0 / 75