Submission #1181554

#	Time	Username	Problem	Language	Result	Execution time	Memory
1181554		al95ireyiz	Fountain (eJOI20_fountain)	C++20	100 / 100	217 ms	62592 KiB

fountain

// It's the evening of another day. And the end of mine...
#pragma GCC optimize("O3")
#pragma GCC optimize("fast-math")
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("no-stack-protector")
#include<bits/stdc++.h>
using namespace std;
// #include<ext/pb_ds/assoc_container.hpp> \
#include<ext/pb_ds/tree_policy.hpp> \
using namespace __gnu_pbds; \
template<class T> \
using Tree=tree<T,null_type,less<T>,rb_tree_tag,tree_order_statisticslmode_update>;
#if !defined(ONLINE_JUDGE) and !defined(EVAL)
#include "template/debug.h"
#else
#define d(x...)
#endif
string sp=" ";
#define F ୨୧
#define fr first
#define er erase
#define sc second
#define in insert
#define ll long long
#define pb push_back
#define mkp make_pair
#define qll queue<ll>
#define dqll deque<ll>
#define mll map<ll,ll>
#define vll vector<ll>
#define pll pair<ll,ll>
#define ull unsigned ll
#define mne min_element
#define mxe max_element
#define rs(x)resize(x)
#define vpll vector<pll>
#define vvll vector<vll>
#define pq priority_queue
#define len(x)(ll)x.size()
#define lcm(x,y)x/gcd(x,y)*y
#define all(x)x.begin(),x.end()
#define umll unordered_map<ll,ll>
#define lg2(x)(63ll-__builtin_clzll(x))
#define precision(x)fixed<<setprecision(x)
#define popcnt(x)(ll)__builtin_popcountll(x)
template<typename t1,typename t2>istream&operator>>(istream&is,pair<t1,t2>&x){return is>>x.fr>>x.sc;}
template<typename t1,typename t2>ostream&operator<<(ostream&os,pair<t1,t2>&x){return os<<x.fr<<' '<<x.sc;}
template<typename t1>istream&operator>>(istream&is,vector<t1>&vc){for(t1&j:vc)is>>j;return is;}
template<typename t1>ostream&operator<<(ostream&os,vector<t1>&vc){for(t1&j:vc)os<<j<<sp;return os;}
// #define ll int_fast32_t
// #define ll int_fast64_t
// #pragma GCC optimize("O2")
// #pragma GCC target("avx,avx2,fma")
// #pragma GCC target("sse,sse2,sse3,ssse3,popcnt,abm,mmx,tune=native")
const ll INF=1e9;
const ll INFL=1e18;
const ll MOD=1e9+7;
// const ll MOD=998244353;
const ll maxn=1e5+5;
ll n,m,k=0;
inline void prc(){}
const ll lg = 30;
vll g[maxn];
ll a[maxn], w[maxn];
ll up[maxn][lg], cm[maxn][lg];
void dfs(ll u){
    for(auto v : g[u]){
        up[v][0] = u;
        cm[v][0] = w[v];
        for(ll i=1;i<lg;i++){
            up[v][i] = up[up[v][i-1]][i-1];
            cm[v][i] = cm[up[v][i-1]][i-1] + cm[v][i-1];
        }
        dfs(v);
    }
}
void _(ll&tt){
    /*
         4  6  3  4 10  4
        10  8  5 14  9 20
    */
    cin>>n>>m;
    for(ll i=1;i<=n;i++) cin>>a[i]>>w[i];
    stack<ll>st;
    for(ll i=n;i>=1;i--){
        while(!st.empty() and a[st.top()] <= a[i]) st.pop();
        if(st.empty()) g[0].pb(i);
        else g[st.top()].pb(i);
        st.push(i);
    }
    dfs(0);
    for(ll i=0,x,y;i<m;i++){
        cin>>x>>y;
        for(ll j=lg-1;j>=0;j--){
            if(y > cm[x][j]){
                y -= cm[x][j];
                x = up[x][j];
            }
        }
        cout<<x<<'\n';
    }
}
signed main(){
    clock_t testcaseruntime=clock();
    cin.tie(0)->sync_with_stdio(0);
    prc();
    ll t=1;
    // cin>>t;
    for(ll tt=1;tt<=t;tt++){
        // cout<<"Case "<<tt<<": ";
        _(tt);
    }
    cerr<<"\n\033[1;31mTime: \033[1;30m"<<(double)(clock()-testcaseruntime)/CLOCKS_PER_SEC<<"\033[1;32m seconds"<<'\n';
}

• Subtask 1: 30 / 30
• Subtask 2: 30 / 30
• Subtask 3: 40 / 40