Submission #515795

#	Time	Username	Problem	Language	Result	Execution time	Memory
515795		Jarif_Rahman	Fire (JOI20_ho_t5)	C++17	1 / 100	1096 ms	30008 KiB

ho_t5

#include <bits/stdc++.h>
#define pb push_back
#define f first
#define sc second
using namespace std;
typedef long long int ll;
typedef string str;

#define debug(s) for(auto x: s) cerr << x << " "; cerr << #s << "\n";

struct BIT{
    int n;
    vector<ll> sm;
    BIT(int _n){
        n = _n;
        sm.resize(n);
    }
    void add(int in, int x){
        in++;
        while(in <= n) sm[in-1]+=x, in+=in&-in;
    }
    ll sum(int in){
        in++;
        ll s = 0;
        while(in >= 1) s+=sm[in-1], in-=in&-in;
        return s;
    }
    ll sum(int l, int r){
        return sum(r)-(l == 0? 0:sum(l-1));
    }
};

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int n, q; cin >> n >> q;
    vector<ll> s(n);
    for(ll &x: s) cin >> x;

    vector<int> prev(n, -1);
    stack<int> st;
    for(int i = n-1; i >= 0; i--){
        while(!st.empty() && s[i] > s[st.top()]) prev[st.top()] = i, st.pop();
        st.push(i);
    }
    while(!st.empty()) st.pop();

    vector<vector<int>> end(n+1);
    vector<vector<pair<int, int>>> chng(n+1);
    for(int i = 0; i < n; i++){
        while(!st.empty() && s[st.top()] <= s[i]){
            int x = st.top();
            st.pop();
            end[i-x-1].pb(x);
            if(prev[x] == -1) continue;
            if(s[prev[x]] <= s[i]) continue;
            chng[i-prev[x]-1].pb({prev[x], i});
        }
        st.push(i);
    }
    while(!st.empty()) end[n-st.top()-1].pb(st.top()), st.pop();

    vector<vector<array<int, 3>>> queries(n);
    for(int i = 0; i < q; i++){
        int t, l, r; cin >> t >> l >> r; t--, l--, r--;
        queries[t].pb({l, r, i});
    }

    vector<ll> ans(q, 0);
    BIT ss(n), bit1(n), bit2(n);
    for(int i = 0; i < n; i++) ss.add(i, s[i]);
    vector<ll> sth(n, 0);

    for(int i = 0; i+1 < n; i++) sth[i] = max(0LL, s[i]-s[i+1]);

    for(int t = 1; t <= n; t++){
        for(int in: end[t-1]){
            if(in != n-1) for(int i = in+1; i <= in+t-1; i++) ss.add(i, sth[in]);
            sth[in] = 0;
        }
        for(auto [in, nxt]: chng[t-1]){
            ll x = sth[in]-(s[in]-s[nxt]);
            for(int i = in+1; i < nxt; i++) ss.add(i, x);
            sth[in] = (s[in]-s[nxt]);
        }
        for(auto [l, r, in]: queries[t-1]){
            ans[in]+=ss.sum(l, r);

            int mx, a, b;
            if(t <= r-l+1){
                mx = t;
                a = l, b = r-mx+1;
                a--, b--;
                a = max(a, 0);
            }
            else{
                mx = r-l+1;
                a = r-t+1, b = l;
                a--, b--;
                a = max(a, 0);
            }
            for(int i = a; i <= b; i++) ans[in]+=sth[i]*mx;
            for(int i = a-1, c = mx-1; i >= 0 && c > 0; i--, c--) ans[in]+=sth[i]*c;
            for(int i = b+1, c = mx-1; i < n && c > 0; i++, c--) ans[in]+=sth[i]*c;
        }
    }

    for(ll x: ans) cout << x << "\n";
}

• Subtask 1: 1 / 1
• Subtask 2: 0 / 6
• Subtask 3: 0 / 7
• Subtask 4: 0 / 6
• Subtask 5: 0 / 80