Submission #1050053

#	Time	Username	Problem	Language	Result	Execution time	Memory
1050053		Whisper	Fountain (eJOI20_fountain)	C++17	30 / 100	78 ms	34568 KiB

fountain

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

#define int long long
#define FOR(i, a, b) for (int i = (a); i <= (b); i++)
#define FORD(i, a, b) for (int i = (b); i >= (a); i --)
#define REP(i, a) for (int i = 0; i < (a); ++i)
#define REPD(i, a) for (int i = (a) - 1; i >= 0; --i)

#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)


constexpr ll LINF = (1ll << 60);
constexpr int INF = (1ll << 30);
constexpr int Mod = 1e9 + 7;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

/*
    Phu Trong from Nguyen Tat Thanh High School for gifted student
*/

template <class X, class Y>
    bool minimize(X &x, const Y &y){
        X eps = 1e-9;
        if (x > y + eps) {x = y; return 1;}
        return 0;
    }

template <class X, class Y>
    bool maximize(X &x, const Y &y){
        X eps = 1e-9;
        if (x + eps < y) {x = y; return 1;}
        return 0;
    }
int nArr, numQuery;
#define MAX                 100005
#define LOG                 18
pair<int, int> A[MAX];

int up[MAX][LOG], sm[MAX][LOG];


void process(void){
    cin >> nArr >> numQuery;
    for (int i = 1; i <= nArr; ++i){
        cin >> A[i].first >> A[i].second;
    }

    stack<int> st;
    for (int i = nArr; i >= 1; --i){
        while(st.size() && A[i].first > A[st.top()].first) st.pop();

        if (st.size()){
            up[i][0] = st.top();
            sm[i][0] = A[i].second;
        }
        else{
            up[i][0] = nArr + 1;
            sm[i][0] = A[i].second;
        }
        st.push(i);
    }
    for (int i = 1; i < LOG; ++i){
        for (int u = 1; u <= nArr; ++u) {
            up[u][i] = up[up[u][i - 1]][i - 1];
            if(u + MASK(i - 1) <= nArr)
                sm[u][i] = sm[u][i - 1] + sm[u + MASK(i - 1)][i - 1];
        }
    }


    for (int i = 1; i <= numQuery; ++i){
        int p, v; cin >> p >> v;

        int init = p;
        for (int l = LOG - 1; l >= 0; --l){
            if (up[p][l] != 0 && (v - sm[p][l] > 0)){
                v -= sm[p][l];
                p = up[p][l];
            }
        }
        cout << (p == nArr + 1 ? 0 : p) << '\n';
    }
}
signed main(){
    #define name "Whisper"
    cin.tie(nullptr) -> sync_with_stdio(false);
    //freopen(name".inp", "r", stdin);
    //freopen(name".out", "w", stdout);
    process();
    return (0 ^ 0);
}

Compilation message (stderr)

fountain.cpp: In function 'void process()':
fountain.cpp:78:13: warning: unused variable 'init' [-Wunused-variable]
   78 |         int init = p;
      |             ^~~~

• Subtask 1: 0 / 30
• Subtask 2: 30 / 30
• Subtask 3: 0 / 40