Submission #465500

#	Time	Username	Problem	Language	Result	Execution time	Memory
465500		Sench2006	Fountain (eJOI20_fountain)	C++14	0 / 100	211 ms	21572 KiB

fountain

#include <bits/stdc++.h>
#include <unordered_map>
using namespace std;

#define ll long long
#define ar array

#define f first
#define s second
#define mpr make_pair
#define pb push_back
#define lb lower_bound
#define ub upper_bound

#define FOR(i, a, b) for(auto i = a; i < b; i++)
#define FORD(i, a, b) for(auto i = a - 1; i >= b; i--)
#define trav(x, v) for(auto x : v)

#define fastio ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define fileio freopen("input.txt", "r", stdin); freopen("output.txt", "w", stdout);

// --------------- SOLUTION --------------- //

const int MAXN = 1e5+5;
int N, Q;
int D[MAXN], C[MAXN];
pair<int, int> P[MAXN][25];
vector <pair<int, int>> ST;

void solve() {
    cin >> N >> Q;
    FOR(i, 0, N) {
        cin >> D[i] >> C[i];
    }
    FORD(i, N, 0) {
        while(!ST.empty() && ST.back().f <= D[i]) ST.pop_back();
        if (ST.empty()) P[i][0] = {0, C[i]};
        else P[i][0] = {ST.back().s, C[i]};
        ST.pb({D[i], i});
    }
    FOR(j, 1, 20) {
        FOR(i, 0, N) {
            pair<int, int> c = P[P[i][j - 1].f][j - 1];
            P[i][j] = {c.f, P[i][j - 1].s + c.s};
        }
    }
    FOR(i, 0, Q) {
        int R, V;
        cin >> R >> V;
        FORD(i, 20, 0) {
            if(V > P[R][i].s){
                V -= P[R][i].s;
                R = P[R][i].f;
            }
        }
 
        cout << R << '\n';
    }
}

int main() {
    fastio;
    // fileio;
    int tests = 1;
    // cin >> tests;
    while (tests--) {
        solve();
    }

    return 0;
}

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