제출 #435930

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
435930		dqhungdl	사탕 분배 (IOI21_candies)	C++17	0 / 100	157 ms	12088 KiB

candies

#include "candies.h"

#include <bits/stdc++.h>
using namespace std;

std::vector<int> distribute_candies(std::vector<int> c, std::vector<int> l,
                                    std::vector<int> r, std::vector<int> v) {
    int n=c.size(),m=v.size();
	vector<long long> S(m+1),Pmin(m+1),Pmax(m+1);
	S[1]=v[0];
	for(int i=2;i<=m;i++)
		S[i]=S[i-1]+v[i-1];
	Pmin.back()=Pmax.back()=S.back();
	for(int i=m-1;i>=0;i--) {
		Pmin[i]=min(Pmin[i+1],S[i]);
		Pmax[i]=max(Pmax[i+1],S[i]);
	}
	vector<int> rs(n);
	for(int i=0;i<n;i++) {
		// If all updates are in range
		if(Pmax[0]-Pmin[0]<=c[i]) {
			int l=1,r=m,pivot=0;
			int limit=Pmin[0];
			while(l<=r) {
				int mid=(l+r)/2;
				if(Pmin[mid]==limit) {
					l=mid+1;
					pivot=mid;
				}
				else
					r=mid-1;
			}
			rs[i]=S.back()-S[pivot];
			continue;
		}
		int l=0,r=m,pivot;
		while(l<=r) {
			int mid=(l+r)/2;
			if(Pmax[mid]-Pmin[mid]>c[i]) {
				pivot=mid;
				l=mid+1;
			} else
				r=mid-1;
		}
		// Find the last time touching the upper wall
		if(Pmin[pivot]==S[pivot]) {
			l=pivot+1,r=m;
			int limit=Pmax[pivot];
			while(l<=r) {
				int mid=(l+r)/2;
				if(Pmax[mid]==limit) {
					pivot=mid;
					l=mid+1;
				} else
					r=mid-1;
			}
			rs[i]=c[i]+S.back()-S[pivot];
		} else { // Find the last time touching the lower wall
			l=pivot+1,r=m;
			int limit=Pmin[pivot];
			while(l<=r) {
				int mid=(l+r)/2;
				if(Pmin[mid]==limit) {
					pivot=mid;
					l=mid+1;
				} else
					r=mid-1;
			}
			rs[i]=S.back()-S[pivot];
		}
	}
	return rs;
}

컴파일 시 표준 에러 (stderr) 메시지

candies.cpp: In function 'std::vector<int> distribute_candies(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
candies.cpp:47:5: warning: 'pivot' may be used uninitialized in this function [-Wmaybe-uninitialized]
   47 |    l=pivot+1,r=m;
      |    ~^~~~~~~~

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• Subtask 2: 0 / 8
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• Subtask 4: 0 / 29
• Subtask 5: 0 / 33