Submission #1009012

#	Time	Username	Problem	Language	Result	Execution time	Memory
1009012		HishamAlshehri	Fountain (eJOI20_fountain)	C++17	0 / 100	138 ms	43204 KiB

fountain

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
//using namespace __gnu_pbds;

#define int long long
#define mod 1000000007
#define base 7001
#define base2 757
// #define pi acos(-1)
#define double long double
//#define ordered_set tree<int, null_type, less<int>, rb_tree_tag,tree_order_statistics_node_update>
//#define ordered_multiset tree<int, null_type, less_equal<int>, rb_tree_tag,tree_order_statistics_node_update>

#pragma GCC optimize("O3,Ofast,unroll-loops")
#pragma GCC target("avx2,sse3,sse4,avx")

constexpr int maxn = 1000001;
const int N = 1 << (int)(ceil(log2(maxn)));

int n, q;
int jump[maxn][21][2], d[maxn], c[maxn], nxt[maxn];

signed main()
{
    cin.tie(0) -> sync_with_stdio(0);
    cin >> n >> q;
    for (int i = 0; i < n; i++)
        cin >> d[i] >> c[i];
    vector<int>ve;
    for (int i = n - 1; i >= 0; i--)
    {
        while(ve.size() && d[ve.back()] <= d[i])
        {
            ve.pop_back();
        }
        if (ve.size())
            nxt[i] = ve.back();
        ve.push_back(i);
    }

    for (int i = 0; i < n; i++)
    {
        jump[i][0][0] = c[i];
        jump[i][0][1] = nxt[i];
    }

    for (int j = 1; j < 21; j++)
    {
        for (int i = 0; i < n; i++)
        {
            jump[i][j][0] = jump[i][j - 1][0] + jump[jump[i][j - 1][1]][j - 1][0];
            jump[i][j][1] = jump[jump[i][j - 1][1]][j - 1][1];
        }
    }
    
    while (q--)
    {
        int r, v;
        cin >> r >> v;
        r--;
        int m = r;
        for (int i = 20; i >= 0; i--)
        {
            while (jump[r][i][0] < v)
            {
                if (r == n - 1)
                {
                    r = -1;
                    break;
                }
                r = jump[r][i][1];
                v -= jump[r][i][0];
            }
            if (r < 0)
                break;
        }

        cout << r + 1 << "\n";
    }
}

Compilation message (stderr)

fountain.cpp: In function 'int main()':
fountain.cpp:64:13: warning: unused variable 'm' [-Wunused-variable]
   64 |         int m = r;
      |             ^

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