Submission #334135

#	Time	Username	Problem	Language	Result	Execution time	Memory
334135		aryan12	Pilot (NOI19_pilot)	C++17	0 / 100	343 ms	82924 KiB

pilot

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

const long long N = 1e6 + 10;
vector<pair<long long, long long> > a(N);
long long ans[N];
bool IsThere[N];
long long par[N], Rank[N];
long long curans = 0;

long long Find(long long x) {
    if(x != par[x]) {
        par[x] = Find(par[x]);
    }
    return par[x];
}

void Unite(long long a, long long b) {
    if(!IsThere[a] || !IsThere[b])
        return;
    long long roota = Find(a), rootb = Find(b);
    curans -= Rank[roota] * (Rank[roota] + 1) / 2;
    curans -= Rank[rootb] * (Rank[rootb] + 1) / 2;
    if(Rank[roota] > Rank[rootb]) {
        Rank[roota] += Rank[rootb];
        par[b] = a;
        curans += Rank[roota] * (Rank[roota] + 1) / 2;
    }
    else {
        Rank[rootb] += Rank[roota];
        par[a] = b;
        curans += Rank[rootb] * (Rank[rootb] + 1) / 2;
    }
}

void Solve() {
    long long n, q;
    cin >> n >> q;
    for(long long i = 0; i < N; i++) {
        IsThere[i] = false;
        par[i] = i;
        Rank[i] = 1;
    }
    for(long long i = 1; i <= n; i++) {
        cin >> a[i].first;
        a[i].second = i;
    }
    sort(a.begin() + 1, a.begin() + 1 + n);
    long long curpos = 1;
    for(long long i = 1; i <= N; i++) {
        ans[i] = ans[i - 1];
        while(curpos <= n && a[curpos].first == i) {
            IsThere[a[curpos].second] = true;
            curans++;
            Unite(a[curpos].second, a[curpos].second + 1);
            Unite(a[curpos].second, a[curpos].second - 1);
            curpos++;
        }
        ans[i] = curans;
    }
    for(long long i = 1; i <= q; i++) {
        long long x;
        cin >> x;
        cout << ans[x] << endl;
    }
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    Solve();
    return 0;
}

Compilation message (stderr)

pilot.cpp: In function 'void Solve()':
pilot.cpp:59:16: warning: iteration 1000009 invokes undefined behavior [-Waggressive-loop-optimizations]
   59 |         ans[i] = curans;
      |         ~~~~~~~^~~~~~~~
pilot.cpp:50:28: note: within this loop
   50 |     for(long long i = 1; i <= N; i++) {
      |                          ~~^~~~

• Subtask 1: 0 / 3
• Subtask 2: 0 / 10
• Subtask 3: 0 / 12
• Subtask 4: 0 / 15
• Subtask 5: 0 / 5
• Subtask 6: 0 / 9
• Subtask 7: 0 / 14
• Subtask 8: 0 / 10
• Subtask 9: 0 / 11
• Subtask 10: 0 / 11