제출 #294584

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
294584		SeDunion	통행료 (IOI18_highway)	C++14	컴파일 에러	0 ms	0 KiB

highway

#include "highway.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int M;
ll Ask (vector<int> &v) {
	vector<int> w(M);
	for (int i : v) w[i] = 1;
	return ask (w);
}

const int N = 2e5;
vector<pair<int,int>> g[N], mb;

void dfs (int v, ll d, int p = -1) {
	for (auto [to, i] : g[v]) if (to != p) {
		if (d == 1) {
			mb.push_back ({to, i});
		} else {
			dfs (to, d-1, v);
		}
	}
}

void find_pair(int N, vector<int> U, vector<int> V, int A, int B) {
	M = U.size();
	for (int i = 0 ; i < M ; ++ i) {
		g[U[i]].push_back ({V[i], i});
		g[V[i]].push_back ({U[i], i});
	}
	ll dist = Ask ({});
	dfs (0, dist);
	int l = 0, r = int(mb.size()) - 1;
	while (l < r) {
		int m = (l + r) >> 1;
		vector<int>now;
		for (int i = 0 ; i <= m ; ++ i) {
			now.push_back (mb[i].second);
		}
		if (Ask(now) > dist) {
			r = m;
		} else {
			l = m + 1;
		}
	}
	answer (0, mb[r].first);
}

컴파일 시 표준 에러 (stderr) 메시지

highway.cpp: In function 'void dfs(int, ll, int)':
highway.cpp:17:12: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   17 |  for (auto [to, i] : g[v]) if (to != p) {
      |            ^
highway.cpp: In function 'void find_pair(int, std::vector<int>, std::vector<int>, int, int)':
highway.cpp:32:19: error: cannot bind non-const lvalue reference of type 'std::vector<int>&' to an rvalue of type 'std::vector<int>'
   32 |  ll dist = Ask ({});
      |                   ^
In file included from /usr/include/c++/9/vector:67,
                 from highway.h:3,
                 from highway.cpp:1:
/usr/include/c++/9/bits/stl_vector.h:484:7: note:   after user-defined conversion: 'std::vector<_Tp, _Alloc>::vector() [with _Tp = int; _Alloc = std::allocator<int>]'
  484 |       vector() = default;
      |       ^~~~~~
highway.cpp:7:22: note:   initializing argument 1 of 'll Ask(std::vector<int>&)'
    7 | ll Ask (vector<int> &v) {
      |         ~~~~~~~~~~~~~^