제출 #413449

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
413449		ritul_kr_singh	Library (JOI18_library)	C++17	100 / 100	416 ms	448 KiB

library

#include <bits/stdc++.h>
using namespace std;
// #define int long long
#define sp << ' ' <<
#define nl << '\n'
 
#include "library.h"
 
void Solve(int n){
	vector<array<int, 2>> e;
	vector<int> g[n], q(n), ans(n);
 
	for(int _=1; _<n; ++_){
		int low = 0, high = n-1;
		while(low < high){
			int mid = (low + high) / 2;
			int exp = mid + 1;
			for(auto &i : e) if(i[0] <= mid && i[1] <= mid) --exp;
			for(int i=0; i<n; ++i) q[i] = i <= mid;
 
			if(Query(q) == exp) low = mid + 1;
			else high = mid;
		}
 
		int x = low; low = 0, high = x-1;
 
		while(low < high){
			int mid = (low + high) / 2;
			int exp = mid + 1;
			for(auto &i : e) if(i[0] <= mid && (i[1] <= mid || i[1] == x)) --exp;
			for(int i=0; i<n; ++i) q[i] = i <= mid || i == x;
 
			if(Query(q) <= exp) high = mid;
			else low = mid + 1;
		}
 
		e.push_back({low, x});
		g[low].push_back(x);
		g[x].push_back(low);
	}
  
  	if(n == 1){
      ans[0] = 1;
      Answer(ans);
      return;
    }
 
	int u;
	for(int i=0; i<n; ++i) if((int)g[i].size() == 1) u = i;
  	assert(u >= 0);
	for(int i=0; i<n; ++i){
		ans[i] = u + 1;
		if(i == n-1) break;
		u = g[u][i && g[u][0] + 1 == ans[i-1]];
	}
 
	Answer(ans);
}

컴파일 시 표준 에러 (stderr) 메시지

library.cpp: In function 'void Solve(int)':
library.cpp:52:14: warning: 'u' may be used uninitialized in this function [-Wmaybe-uninitialized]
   52 |   ans[i] = u + 1;
      |            ~~^~~

• Subtask 1: 19 / 19
• Subtask 2: 81 / 81