제출 #56487

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
56487		Kerim	커다란 상품 (IOI17_prize)	C++17	90 / 100	139 ms	572 KiB

prize

#include "bits/stdc++.h"
#include "prize.h"
#define MAXN 200009
#define INF 1000000007
#define mp(x,y) make_pair(x,y)
#define all(v) v.begin(),v.end()
#define pb(x) push_back(x)
#define wr cout<<"----------------"<<endl;
#define ppb() pop_back()
#define tr(ii,c) for(__typeof((c).begin()) ii=(c).begin();ii!=(c).end();ii++)
#define ff first
#define ss second
#define my_little_dodge 46
#define debug(x)  cerr<< #x <<" = "<< x<<endl;
#define left cep
#define right sag
using namespace std;

typedef long long ll;
typedef pair<int,int> PII;
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<=b){a=b;return 1;}return 0;}
int n;
const int c=450;
//~ int arr[MAXN],query=0;
//~ int left[MAXN],right[MAXN],cnt[123];
//~ vector<int>ask(int x){
	//~ query++;
	//~ vector<int>res(2,0);
	//~ assert(res[0]+res[1]==0);
	//~ res[0]=left[x];
	//~ res[1]=right[x];
	//~ return res;	
//~ }
int find_best(int N){
	n=N;
	int mx=0,who;
	vector<int>res,tmp;
	for(int i=0;i<min(n,500);i++){
		res=ask(i);
		if(res[0]+res[1]==0)
			return i;
		if(umax(mx,res[0]+res[1]))
			who=i;
	}who++;
	while(who<n){
		tmp=ask(who);
		if(tmp[0]+tmp[1]==0)
			return who;
		if(tmp[0]+tmp[1]<mx){
			who++;
			continue;
		}	
		while(who+c<n and ask(who+c)==tmp)
			who+=c;
		int st=who+1,en=n-1,pos=who;
		while(st<=en){
			int mid=(st+en)/2;
			res=ask(mid);
			if(res!=tmp)
				en=mid-1;
			else{
				pos=mid;
				st=mid+1;
			}	
		}
		who=pos+1;
	}
	return -1;
}
//~ int main(){
    //~ freopen("file.in", "r", stdin);
    //~ int N;
    //~ scanf("%d",&N);
    //~ for(int i=0;i<N;i++)
		//~ scanf("%d",arr+i);
	//~ for(int i=0;i<N;i++){
		//~ for(int j=1;j<arr[i];j++)
			//~ left[i]+=cnt[j];
		//~ cnt[arr[i]]++;	
	//~ }	
	//~ memset(cnt,0,sizeof cnt);
	//~ for(int i=N-1;i>=0;i--){
		//~ for(int j=1;j<arr[i];j++)
			//~ right[i]+=cnt[j];
		//~ cnt[arr[i]]++;	
	//~ }
	//~ int ans=find_best(N);
	//~ assert(arr[ans]==1);
	//~ printf("%d\n",ans);	
	//~ debug(query);
	//~ return 0;
//~ }

컴파일 시 표준 에러 (stderr) 메시지

prize.cpp: In function 'int find_best(int)':
prize.cpp:45:6: warning: 'who' may be used uninitialized in this function [-Wmaybe-uninitialized]
  }who++;
   ~~~^~

• Subtask 1: 20 / 20
• Subtask 2: 70 / 80