제출 #390460

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
390460		Keshi	커다란 상품 (IOI17_prize)	C++17	20 / 100	119 ms	1960 KiB

prize

//In the name of God
#include <bits/stdc++.h>
#include "prize.h"
using namespace std;

typedef int ll;
typedef pair<ll, ll> pll;

const ll maxn = 2e5 + 100;
const ll mod = 1e9 + 7;
const ll inf = 1e9;

#define pb push_back
#define Mp make_pair
#define F first
#define S second
#define Sz(x) ll((x).size())
#define all(x) (x).begin(), (x).end()

ll p[maxn], cnt;

int find_best(int n){
	srand(time(NULL));

	for(ll i = 0; i < n; i++){
		p[i] = i;
	}
	random_shuffle(p, p + n);
	ll x = 0;
	for(ll i = 0; i < min(20, n); i++){
		auto f = ask(p[i]);
		cnt++;
			if(cnt == 10000) cout << 1 / 0;
		x = max(x, f[0] + f[1]);
	}
	ll ptr = 0;
	while(ptr < n){
		auto f = ask(ptr);
		cnt++;
			if(cnt == 10000) cout << 1 / 0;
		if(f[0] + f[1] == 0) return ptr;
		if(f[0] + f[1] != x){
			ptr++;
			continue;
		}
		ll l = ptr, r = n;
		while(r - l > 1){
			ll mid = (l + r) >> 1;
			auto f2 = ask(mid);
			cnt++;
			if(cnt == 10000) cout << 1 / 0;
			if(f2[0] == f[0] && f2[1] == f[1]) l = mid;
			else r = mid;
		}
		ptr = r;
	}
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

prize.cpp: In function 'int find_best(int)':
prize.cpp:33:31: warning: division by zero [-Wdiv-by-zero]
   33 |    if(cnt == 10000) cout << 1 / 0;
      |                             ~~^~~
prize.cpp:40:31: warning: division by zero [-Wdiv-by-zero]
   40 |    if(cnt == 10000) cout << 1 / 0;
      |                             ~~^~~
prize.cpp:51:31: warning: division by zero [-Wdiv-by-zero]
   51 |    if(cnt == 10000) cout << 1 / 0;
      |                             ~~^~~

• Subtask 1: 20 / 20
• Subtask 2: 0 / 80