oj.uz

Submission #1097286

# Submission time Handle Problem Language Result Execution time Memory
1097286 2024-10-06T16:16:22 Z vjudge1 Fountain (eJOI20_fountain) C++17
100 / 100
 138 ms 14168 KB 
#include <set>
#include <map>
#include <cmath>
#include <queue>
#include <deque>
#include <stack>
#include <math.h>
#include <bitset>
#include <vector>
#include <string>
#include <cstdio>
#include <cctype>
#include <numeric>
#include <fstream>
#include <sstream>
#include <cstdlib>
#include <iomanip>
#include <cassert>
#include <cstring>
#include <stdio.h>
#include <string.h>
#include <iterator>
#include <iostream>
#include <algorithm>
#include <strings.h>
#include <functional>
#include <unordered_set>
#include <unordered_map>
#define fore(i, a, b) for (int i = (a), i##_last = (b); i < i##_last; ++i)
#define fort(i, a, b) for (int i = (a), i##_last = (b); i <= i##_last; ++i)
#define ford(i, a, b) for (int i = (a), i##_last = (b); i >= i##_last; --i)
#define fi first
#define se second
#define pb push_back
#define sz(x) ((int)(x).size())
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
using namespace std;
using ll = long long;
using ld = long double;

template<class A, class B> bool maxi(A &a, const B &b) {return (a < b) ? (a = b, true):false;};
template<class A, class B> bool mini(A &a, const B &b) {return (a > b) ? (a = b, true):false;};

typedef unsigned long long ull;
typedef pair<int, int> ii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<vi> vvi;
typedef vector<vii> vvii;

constexpr int MAX_N = 1E5 + 5, INF = 0X3F3F3F3F, LOG2_MAX_N = 20;

signed result, h[MAX_N], ancestor[LOG2_MAX_N][MAX_N], floorLog2[MAX_N], sum[MAX_N];
int N, Q, R, V, D[MAX_N], C[MAX_N];
stack<int> s;

int findAncestor(const int j, const int i) {
    if (i > N)
        return i;
    return ancestor[j][i];
}

int findSum(const int x, const int y) {
    return sum[x] - sum[y] + C[y];
}

signed main() {

    #ifdef LOCAL
    freopen("input.INP", "r", stdin);
//    freopen("output.OUT", "w", stdout);
    #endif // LOCAL
    cin.tie(0) -> sync_with_stdio(0);
    cout.tie(0);

    cin >> N >> Q;

    D[N + 1] = INF;

    fort(i, 1, N)
        cin >> D[i] >> C[i];

    s.push(N + 1);

    ford(i, N, 1) {
        for (; !s.empty() && D[s.top()] <= D[i]; s.pop());
        ancestor[0][i] = s.top();
        h[i] = h[ancestor[0][i]] + 1;
        sum[i] = sum[ancestor[0][i]] + C[i];
        s.push(i);
    }

    for (int j = 1; (1 << j) <= N; ++j)
        fort(i, 1, N - (1 << j) + 1)
            ancestor[j][i] = findAncestor(j - 1, findAncestor(j - 1, i));

    fort(i, 2, N)
        floorLog2[i] = floorLog2[i >> 1] + 1;

    fort(_, 1, Q) {
        cin >> R >> V;

        if (V > sum[R]) {
            cout << 0 << '\n';
            continue;
        }

        if (V <= C[R]) {
            cout << R << '\n';
            continue;
        }

        result = R;

        ford(j, floorLog2[h[R]], 0)
            while (result != ancestor[j][result] && findSum(R, ancestor[j][result]) < V)
                result = ancestor[j][result];

        result = ancestor[0][result];

        cout << result << '\n';
    }

    return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 604 KB Output is correct
5 Correct 1 ms 604 KB Output is correct
6 Correct 1 ms 604 KB Output is correct
7 Correct 1 ms 604 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 91 ms 12076 KB Output is correct
2 Correct 98 ms 11780 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 604 KB Output is correct
5 Correct 1 ms 604 KB Output is correct
6 Correct 1 ms 604 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 91 ms 12076 KB Output is correct
9 Correct 98 ms 11780 KB Output is correct
10 Correct 1 ms 600 KB Output is correct
11 Correct 51 ms 6988 KB Output is correct
12 Correct 138 ms 14168 KB Output is correct
13 Correct 118 ms 13396 KB Output is correct
14 Correct 65 ms 12456 KB Output is correct
15 Correct 61 ms 12904 KB Output is correct