Submission #753114

#	Time	Username	Problem	Language	Result	Execution time	Memory
753114		minhnhatnoe	Pilot (NOI19_pilot)	C++14	100 / 100	539 ms	48344 KiB

pilot

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

ll cpair(ll s){
    return s * (s+1) / 2;
}
struct dsu{
    ll c = 0;
    vector<int> p;
    vector<bool> s;
    dsu(int n): p(n, -1), s(n) {}
    int find(int v){
        if (p[v] < 0) return v;
        return p[v] = find(p[v]);
    }
    void merge(int a, int b){
        a = find(a), b = find(b);
        if (a == b) return;
        if (-p[a] < -p[b]) swap(a, b);
        c -= cpair(-p[a]) + cpair(-p[b]);
        p[a] += p[b];
        c += cpair(-p[a]);
        p[b] = a;
    }
    void activate(int pos){
        c += 1;
        s[pos] = true;
        if (pos && s[pos-1]){
            merge(pos, pos-1);
        }
        if (pos != s.size()-1 && s[pos+1]){
            merge(pos, pos+1);
        }
    }
};

signed main(){
    cin.tie(0)->sync_with_stdio(0);
    int n, q; cin >> n >> q;
    dsu g(n);
    vector<pair<int, int>> a(n), b(q);
    for (int i=0; i<n; i++){
        cin >> a[i].first;
        a[i].second = i;
    }
    for (int i=0; i<q; i++){
        cin >> b[i].first;
        b[i].second = i;
    }
    vector<ll> result(q);
    sort(a.begin(), a.end()), sort(b.begin(), b.end());
    int aptr = 0;
    for (int i=0; i<b.size(); i++){
        while (aptr < a.size() && a[aptr].first <= b[i].first){
            g.activate(a[aptr].second);
            aptr++;
        }
        result[b[i].second] = g.c;
    }
    for (int i=0; i<result.size(); i++){
        cout << result[i] << "\n";
    }
}

Compilation message (stderr)

pilot.cpp: In member function 'void dsu::activate(int)':
pilot.cpp:32:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bool>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |         if (pos != s.size()-1 && s[pos+1]){
      |             ~~~~^~~~~~~~~~~~~
pilot.cpp: In function 'int main()':
pilot.cpp:54:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |     for (int i=0; i<b.size(); i++){
      |                   ~^~~~~~~~~
pilot.cpp:55:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |         while (aptr < a.size() && a[aptr].first <= b[i].first){
      |                ~~~~~^~~~~~~~~~
pilot.cpp:61:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |     for (int i=0; i<result.size(); i++){
      |                   ~^~~~~~~~~~~~~~

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