Submission #979258

#	Time	Username	Problem	Language	Result	Execution time	Memory
979258		c2zi6	Easter Eggs (info1cup17_eastereggs)	C++14	100 / 100	18 ms	1800 KiB

eastereggs

#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
#define ff first
#define ss second
#define pb push_back
#define all(a) (a).begin(), (a).end()
#define replr(i, a, b) for (int i = int(a); i <= int(b); ++i)
#define reprl(i, a, b) for (int i = int(a); i >= int(b); --i)
#define rep(i, n) for (int i = 0; i < int(n); ++i)
#define mkp(a, b) make_pair(a, b)
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> PII;
typedef vector<int> VI;
typedef vector<PII> VPI;
typedef vector<VI> VVI;
typedef vector<VVI> VVVI;
typedef vector<VPI> VVPI;
typedef pair<ll, ll> PLL;
typedef vector<ll> VL;
typedef vector<PLL> VPL;
typedef vector<VL> VVL;
typedef vector<VVL> VVVL;
typedef vector<VPL> VVPL;
template<class T> T setmax(T& a, T b) {if (a < b) return a = b; return a;}
template<class T> T setmin(T& a, T b) {if (a < b) return a; return a = b;}
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
template<class T>
using indset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#include "grader.h"

int n;
VVI gp;

VI euler;
void dfs(int u = 0, int p = -1) {
	euler.pb(u+1);
	for (int v : gp[u]) if (v != p) dfs(v, u);
}

bool qr(int x) {
	VI tmp;
	replr(i, 0, x) tmp.pb(euler[i]);
	return query(tmp);
}

int findEgg(int N, VPI bridges) {
	n = N;
	gp = VVI(n);
	for (auto[u, v] : bridges) {
		u--, v--;
		gp[u].pb(v);
		gp[v].pb(u);
	}
	dfs();
	int l = -1, r = n-1;
	while (l + 1 < r) {
		int m = (l + r) / 2;
		if (qr(m)) r = m;
		else l = m;
	}
	return euler[r];
}

Compilation message (stderr)

eastereggs.cpp: In function 'int findEgg(int, VPI)':
eastereggs.cpp:52:11: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   52 |  for (auto[u, v] : bridges) {
      |           ^

• Subtask 1: 40 / 40
• Subtask 2: 40 / 40
• Subtask 3: 20 / 20