제출 #760370

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
760370		GrindMachine	말 (IOI15_horses)	C++17	17 / 100	90 ms	20780 KiB

horses

// Om Namah Shivaya

#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;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x, y) ((x + y - 1) / (y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i, n) for(int i = 0; i < n; ++i)
#define rep1(i, n) for(int i = 1; i <= n; ++i)
#define rev(i, s, e) for(int i = s; i >= e; --i)
#define trav(i, a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a, b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a, b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*



*/

const int MOD = 1e9 + 7;
const int N = 5e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

#include "horses.h"

template<typename T>
struct segtree {
    // https://codeforces.com/blog/entry/18051

    /*=======================================================*/

    struct data {
    	ll a;
    };

    data neutral = {1};

    data merge(data &left, data &right) {
    	data curr;
    	curr.a = left.a * right.a % MOD;
    	return curr;
    }

    void create(int i, T v) {
    	tr[i].a = v;
    }

    void modify(int i, T v) {
    	tr[i].a = v;
    }

    /*=======================================================*/

    int n;
    vector<data> tr;

    segtree() {

    }

    segtree(int siz) {
        init(siz);
    }

    void init(int siz) {
        n = siz;
        tr.assign(2 * n, neutral);
    }

    void build(vector<T> &a, int siz) {
        rep(i, siz) create(i + n, a[i]);
        rev(i, n - 1, 1) tr[i] = merge(tr[i << 1], tr[i << 1 | 1]);
    }

    void pupd(int i, T v) {
        modify(i + n, v);
        for (i = (i + n) >> 1; i; i >>= 1) tr[i] = merge(tr[i << 1], tr[i << 1 | 1]);
    }

    data query(int l, int r) {
        data resl = neutral, resr = neutral;

        for (l += n, r += n; l <= r; l >>= 1, r >>= 1) {
            if (l & 1) resl = merge(resl, tr[l++]);
            if (!(r & 1)) resr = merge(tr[r--], resr);
        }

        return merge(resl, resr);
    }
};

ll n;
vector<ll> a(N), b(N);
segtree<ll> st(N);

int get_ans(){
	// {
	// 	ll ans = 0;
	// 	ll curr = 1;
	// 	rep(i,n){
	// 		curr *= a[i];
	// 		amax(ans, curr * b[i]);
	// 	}

	// 	return ans;
	// }

	ll prod = 1;
	ll point = -1;

	rev(i,n-1,0){
		prod *= a[i];
		point = i;
		if(prod > inf1){
			break;
		}
	}

	ll befprod = st.query(0,point-1).a;
	__int128 curr = 1;
	__int128 best = 0;

	for(int i = max(point-1,0ll); i < n; ++i){
		curr *= a[i];
		amax(best, curr * b[i]);
	}

	ll ans = (best % MOD) * befprod % MOD;
	return ans;
}

int init(int n_, int X[], int Y[]) {
	n = n_;
	rep(i,n) a[i] = X[i], b[i] = Y[i];

	rep(i,n){
		st.pupd(i,a[i]);
	}

	return get_ans();
}

int updateX(int pos, int val) {
	st.pupd(pos,val);
	return get_ans();	
}

int updateY(int pos, int val) {
	b[pos] = val;
	return get_ans();
}

컴파일 시 표준 에러 (stderr) 메시지

horses.cpp: In function 'int get_ans()':
horses.cpp:149:9: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
  149 |  rev(i,n-1,0){
      |        ~^~
horses.cpp:32:34: note: in definition of macro 'rev'
   32 | #define rev(i, s, e) for(int i = s; i >= e; --i)
      |                                  ^
horses.cpp:157:31: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
  157 |  ll befprod = st.query(0,point-1).a;
      |                          ~~~~~^~
horses.cpp:161:17: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
  161 |  for(int i = max(point-1,0ll); i < n; ++i){
      |              ~~~^~~~~~~~~~~~~
horses.cpp:166:34: warning: conversion from '__int128' to 'll' {aka 'long long int'} may change value [-Wconversion]
  166 |  ll ans = (best % MOD) * befprod % MOD;
      |           ~~~~~~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp:167:9: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
  167 |  return ans;
      |         ^~~

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