Submission #1312534

#	Time	Username	Problem	Language	Result	Execution time	Memory
1312534		baktrr	Fountain (eJOI20_fountain)	C++20	100 / 100	283 ms	35940 KiB

fountain

/**
  III     U   U  N   N  DDDD   EEEEE  RRRR   SSSS  TTTTT  AAAAA  N   N  DDDD      I  TTTTT     N   N   OOO   W   W
   I      U   U  NN  N  D   D  E      R   R  S       T    A   A  NN  N  D   D     I    T       NN  N  O   O  W   W
   I      U   U  N N N  D   D  EEEE   RRRR   SSSS    T    AAAAA  N N N  D   D     I    T       N N N  O   O  W W W
   I      U   U  N  NN  D   D  E      R  R      S    T    A   A  N  NN  D   D     I    T       N  NN  O   O  WW WW
  III     UUUUU  N   N  DDDD   EEEEE  R   R  SSSS    T    A   A  N   N  DDDD      I    T       N   N   OOO   W   W
**/

//18.09.25
#include <bits/stdc++.h>

// #pragma optimize("g", on)
// #pragma GCC optimize ("inline")
// #pragma GCC optimize ("Ofast")
// #pragma GCC optimize ("unroint-loops")
// #pragma GCC optimize ("03")
// #pragma GCC target ("sse,sse2,sse3,ssse3,sse4,popcnt,abm,avx2,mmx,fma,avx,tune=native")

// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>
using namespace std;
// using namespace __gnu_pbds;
 
#define F first
#define ent '\n'
#define S second
#define no "NO\n"
#define in insert
#define yes "YES\n"
#define pb push_back
#define int long long
#define sz(w) w.size()
#define pii pair} <int, int>
#define all(w) w.begin(), w.end()
#define rall(w) w.rbegin(), w.rend()
#define Yeah ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
 
const int MOD = 998244353, M = 4e5 + 7, N = 1e5 + 7, INF = 2e18, inf = 1e9 + 7, LOG = 20 , mod = 1e9 + 7 ;

// find_by_order idx and get s[idx], idx from 0
// order_of_key cnt of x >

// template <typename T>
// using ordered_set = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>;
// mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int up[N][LOG] , sum[N][LOG] ;

void accepted() {
    int n  , m ;
    cin >> n >> m ;
    int a[n + 1] , b[n + 1] ;
    for(int i = 1 ; i <= n ; i++) {
        cin >> a[i] >> b[i] ;
    }
    stack <int> st ;
    int par[n + 1] = {} ;
    for(int i = n ; i >= 1 ; i--) {
        while(!st.empty() && a[st.top()] <= a[i]) {
            st.pop() ;
        }
        if(!st.empty()) {
            par[i] = st.top() ;
        }
        st.push(i) ;
        up[i][0] = par[i] ;
        sum[i][0] = b[par[i]] ; 
    }
    for(int k = 1 ; k < LOG ; k++) {
        for(int v = 1 ; v <= n ; v++) {
            if(up[up[v][k - 1]][k - 1]) {
                up[v][k] = up[up[v][k - 1]][k - 1] ;
                sum[v][k] = sum[up[v][k - 1]][k - 1] + sum[v][k - 1] ;
            }
            else {
                up[v][k] = 0 ;
                sum[v][k] = sum[v][k - 1] ;
            }
        }
    }
    for(int i = 1 ; i <= m ; i++) {
        int v , x ;
        cin >> v >> x ;
        if(x <= b[v]) {
            cout << v << ent ;
            continue ;
        }
        x -= b[v] ;
        for(int k = LOG - 1 ; k >= 0 ; k--) {
            if(up[v][k] && sum[v][k] < x) {
                x -= sum[v][k] ;
                v = up[v][k] ;
            }
        }
        cout << par[v] << ent ;
    }
}

signed main() {
    Yeah
 
    // PLS NeverGiveUp

    // freopen("cowpatibility.in", "r", stdin) ;  
    // freopen("cowpatibility.out", "w", stdout) ;

    int T = 1 ;
    // cin >> T ;
    while(T--) {
        accepted() ;
        cout << endl ;
    }
}



/**
**/

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