Submission #996278

#	Time	Username	Problem	Language	Result	Execution time	Memory
996278		vladilius	역사적 조사 (JOI14_historical)	C++17	100 / 100	1755 ms	22892 KiB

historic

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
#define pb push_back
#define ff first
#define ss second
#define ins insert

struct ST{
    vector<ll> t;
    int n;
    ST(int ns){
        n = ns;
        t.resize(4 * n);
    }
    void upd(int v, int tl, int tr, int& p, int& k){
        if (tl == tr){
            t[v] += k;
            return;
        }
        int tm = (tl + tr) / 2, vv = 2 * v;
        if (p <= tm){
            upd(vv, tl, tm, p, k);
        }
        else {
            upd(vv + 1, tm + 1, tr, p, k);
        }
        t[v] = max(t[vv], t[vv + 1]);
    }
    void upd(int p, int k){
        upd(1, 1, n, p, k);
    }
    ll get(int v, int tl, int tr, int& l, int& r){
        if (l > tr || r < tl) return 0;
        if (l <= tl && tr <= r) return t[v];
        int tm = (tl + tr) / 2, vv = 2 * v;
        return max(get(vv, tl, tm, l, r), get(vv + 1, tm + 1, tr, l, r));
    }
    ll get(int l, int r){
        return get(1, 1, n, l, r);
    }
};

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    
    int n, q; cin>>n>>q;
    vector<int> a(n + 1);
    map<int, vector<int>> p;
    for (int i = 1; i <= n; i++){
        cin>>a[i];
        p[a[i]].pb(i);
    }
    const int S = sqrt(n);
    vector<int> x;
    for (auto f: p){
        if (f.ss.size() > S){
            x.pb(f.ff);
        }
    }
    vector<pii> end[n + 1];
    for (int i = 1; i <= q; i++){
        int l, r; cin>>l>>r;
        end[r].pb({l, i});
    }
    
    vector<int> :: iterator it1, it2;
    auto count = [&](int l, int r, int x){
        it1 = lower_bound(p[x].begin(), p[x].end(), l);
        it2 = upper_bound(p[x].begin(), p[x].end(), r);
        return (it2 - it1);
    };
    
    ST T(n);
    vector<ll> out(q + 1);
    for (int i = 1; i <= n; i++){
        if (p[a[i]].size() <= S){
            for (int j: p[a[i]]){
                T.upd(j, a[i]);
                if (j == i) break;
            }
        }
        for (auto [l, j]: end[i]){
            out[j] = T.get(l, i);
            for (int f: x){
                out[j] = max(out[j], 1LL * f * count(l, i, f));
            }
        }
    }
    
    for (int i = 1; i <= q; i++){
        cout<<out[i]<<"\n";
    }
}

Compilation message (stderr)

historic.cpp: In function 'int main()':
historic.cpp:60:25: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'const int' [-Wsign-compare]
   60 |         if (f.ss.size() > S){
      |             ~~~~~~~~~~~~^~~
historic.cpp:80:28: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'const int' [-Wsign-compare]
   80 |         if (p[a[i]].size() <= S){
      |             ~~~~~~~~~~~~~~~^~~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 25 / 25
• Subtask 4: 60 / 60