Submission #1213024

#	Time	Username	Problem	Language	Result	Execution time	Memory
1213024		Lemser	말 (IOI15_horses)	C++20	34 / 100	1595 ms	8252 KiB

horses

#include "horses.h"
#include <bits/stdc++.h>
using namespace std;
 
using ll = long long;
using ull = unsigned long long;
using lld = long double;
using ii = pair<int,int>;
using pll = pair<ll, ll>;
 
using vi = vector<int>;
using vll = vector<ll>;
using vii = vector<ii>;
using vpll = vector<pll>;
using vlld = vector<lld>;
 
#define all(x) x.begin(),x.end()
#define lsb(x) x&(-x)
#define gcd(a,b) __gcd(a,b)
#define sz(x) (int)x.size()
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define fls cout.flush()
 
#define fore(i, l, r) for (auto i = l; i < r; i++)
#define fo(i, n) fore (i, 0, n)
#define forex(i, r, l) for (auto i = r-1; i >= l; i--)
#define ffo(i, n) forex (i, n, 0)
 
bool cmin(ll &a, ll b) { if (b < a) { a=b; return 1; } return 0; }
bool cmax(ll &a, ll b) { if (b > a) { a=b; return 1; } return 0; }

const int N = 5e5 + 7, mod = 1e9 + 7;
int x[N], y[N], n;

int calc () {
	map<int, array<int, 2>> mx;
	ll suf = 1;
	ffo (i, n-1) {
		suf *= x[i+1];
		if (suf >= 1e9) break;
		mx[suf] = max(mx[suf], array<int, 2>{y[i], i});
	}
	ll bst = n-1;
	suf = 1;
	for (auto [act_suf, v]: mx) {
		if (1ll*v[0] > 1ll*(act_suf/suf)*y[bst]) {
			bst = v[1];
			suf = act_suf;
		}
	}
	ll ans = 1;
	fo (i, bst+1) (ans *= x[i]) %= mod;
	(ans *= y[bst]) %= mod;
	return int(ans);
}

int init(int NN, int X[], int Y[]) {
	n = NN;
	fo (i, n) {
		x[i] = X[i];
		y[i] = Y[i];
	}
	return calc();
}

int updateX(int pos, int val) {	
	x[pos] = val;
	return calc();
}

int updateY(int pos, int val) {
	y[pos] = val;
	return calc();
}

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