Submission #928046

#	Time	Username	Problem	Language	Result	Execution time	Memory
928046		VMaksimoski008	Horses (IOI15_horses)	C++14	17 / 100	65 ms	69456 KiB

horses

#include <bits/stdc++.h>
#include "horses.h"
 
#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 pii = pair<int, int>;
using pll = pair<ll, ll>;
using Node = pair<double, int>;
 
const int mod = 1e9 + 7;
const int maxn = 1e5 + 5;
 
int n;
vector<ll> X(5*maxn), Y(maxn), PS(5*maxn);
vector<double> logX(5*maxn), logY(maxn), PL(5*maxn);
 
ll exp(ll a, ll b) {
    ll ans = 1;
    while(b) {
        if(b & 1) ans = (ans * a) % mod;
        a = (a * a) % mod;
        b /= 2;
    }
    return ans;
}
 
ll inv(ll x) { return exp(x, mod-2); }
 
Node merge(Node a, Node b) {
    if(a.first > b.first) return a;
    return b;
}
 
struct SegTree {
    int N;
    vector<ll> prod;
    vector<Node> tree;
 
    void init() {
        N = n;
        prod.resize(4*N+5);
        tree.resize(4*N+5);
        build(1, 0, N-1);
    }
 
    void build(int u, int tl, int tr) {
        if(tl == tr) {
            tree[u] = { PL[tl] + logY[tl], tl };
            prod[u] = X[tl];
        } else {
            int tm = (tl + tr) / 2;
            build(2*u, tl, tm);
            build(2*u+1, tm+1, tr);
            prod[u] = (prod[2*u] * prod[2*u+1]) % mod;
            tree[u] = merge(tree[2*u], tree[2*u+1]);
        }
    }
 
    void updateProd(int u, int tl, int tr, int pos, int val) {
        if(tl == tr) {
            prod[u] = val;
        } else {
            int tm = (tl + tr) / 2;
            if(pos <= tm)
                updateProd(2*u, tl, tm, pos, val);
            else
                updateProd(2*u+1, tm+1, tr, pos, val);
            prod[u] = (prod[2*u] * prod[2*u+1]) % mod;
        }
    }
 
    ll getProd(int u, int tl, int tr, int l, int r) {
        if(tl > tr || l > tr || tl > r) return 1;
        if(l <= tl && tr <= r) return prod[u];
        int tm = (tl + tr) / 2;
        return (
            getProd(2*u, tl, tm, l, r) *
            getProd(2*u+1, tm+1, tr, l, r)
        ) % mod;
    }
 
    void updateProd(int pos, int val) { updateProd(1, 0, N-1, pos, val); }
    ll getProd(int p) { return getProd(1, 0, N-1, 0, p); } 
    int getPos() { return tree[1].second; }
} tree;

int calc() {
    int pos = tree.getPos();
    ll ans = (tree.getProd(pos) * Y[pos]) % mod;
    return (int)ans;
}
 
int init(int N, int x[], int y[]) {
    n = N;
    for(int i=0; i<n; i++) {
        X[i] = x[i], Y[i] = y[i];
        PS[i] = X[i];
        if(i) PS[i] = (PS[i] * PS[i-1]) % mod;
        logX[i] = log10(X[i]), logY[i] = log10(y[i]);
        PL[i] = logX[i];
        if(i) PL[i] += PL[i-1];
    }
 
    tree.init();
    
    return calc();
}
 
int updateX(int p, int v) {
    X[p] = v, logX[p] = log10(v);
    tree.updateProd(p, v);
    return calc();
}
 
int updateY(int p, int v) {
    return calc();
}
 
// int main() {
//     int n;
//     cin >> n;
//     int x[n], y[n];
//     for(int i=0; i<n; i++) cin >> x[i];
//     for(int i=0; i<n; i++) cin >> y[i];
//     cout << init(n, x, y) << '\n';
    
//     int m;
//     cin >> m;

//     while(m--) {
//         int t, p, v;
//         cin >> t >> p >> v;
//         if(t == 1) updateX(p, v);
//         else updateY(p, v);
//     }

//     return 0;
// }

Compilation message (stderr)

horses.cpp: In function 'int updateY(int, int)':
horses.cpp:120:17: warning: unused parameter 'p' [-Wunused-parameter]
  120 | int updateY(int p, int v) {
      |             ~~~~^
horses.cpp:120:24: warning: unused parameter 'v' [-Wunused-parameter]
  120 | int updateY(int p, int v) {
      |                    ~~~~^

• Subtask 1: 17 / 17
• Subtask 2: 0 / 17
• Subtask 3: 0 / 20
• Subtask 4: 0 / 23
• Subtask 5: 0 / 23