Submission #60632

#	Time	Username	Problem	Language	Result	Execution time	Memory
60632		Tenuun	Simurgh (IOI17_simurgh)	C++17	0 / 100	126 ms	3820 KiB

simurgh

#include "simurgh.h"
#include <bits/stdc++.h>
 
using namespace std;
 
vector<pair<int, int> >adj[501];
vector<int>t;
vector<int> res;
bool vis[501], check[125000]={false};
int N;

void DFS(int u, int p){
	vis[u]=true;
	for(auto v:adj[u]){
		if(v.first!=p && vis[v.first]==false){
			if(p!=-1) t.push_back(v.second);
			DFS(v.first, u);
		}
	}
}
 
int calc(int u){
	vector<int>b;
	int mx=-1, p=-1, tmp;
	if(t.size()!=N-2) return -1;
	for(auto v:adj[u]){
		if(check[v.second]){
			t.push_back(v.second);
			mx=count_common_roads(t);
			t.pop_back();
			break;
		}
	}
	for(auto v:adj[u]){
		if(check[v.second])continue;
		t.push_back(v.second);
		tmp=count_common_roads(t);
		if(mx==-1){
			mx=tmp;
			b.push_back(v.second);
			p=v.second;
		}
		else if(tmp>mx){
			b.clear();
			mx=tmp;
			b.push_back(v.second);
			p=v.second;
		}
		else if(tmp==mx){
			b.push_back(v.second);
			p=v.second;
		}
		t.pop_back();
	}
	for(int i=0; i<b.size(); i++){
		check[b[i]]=true;
		res.push_back(b[i]);
	}
	return p;
}
 
vector<int> find_roads(int n, std::vector<int> u, std::vector<int> v) {
	N=n;
	int f, ind=0;
	memset(check, false, sizeof check);
	for(int i=0; i<u.size(); i++){
		adj[u[i]].push_back({v[i], i});
		adj[v[i]].push_back({u[i], i});
	}
	for(int i=0; i<n; i++){
		memset(vis, false, sizeof vis);
		t.clear();
		DFS(i, -1);
		f=calc(i);
		if(f<0 || f>u.size() || check[f]) continue;
	}
	res.resize(n-1);
	return res;
}

Compilation message (stderr)

simurgh.cpp: In function 'int calc(int)':
simurgh.cpp:25:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if(t.size()!=N-2) return -1;
     ~~~~~~~~^~~~~
simurgh.cpp:55:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0; i<b.size(); i++){
               ~^~~~~~~~~
simurgh.cpp: In function 'std::vector<int> find_roads(int, std::vector<int>, std::vector<int>)':
simurgh.cpp:66:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0; i<u.size(); i++){
               ~^~~~~~~~~
simurgh.cpp:75:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(f<0 || f>u.size() || check[f]) continue;
             ~^~~~~~~~~
simurgh.cpp:64:9: warning: unused variable 'ind' [-Wunused-variable]
  int f, ind=0;
         ^~~

• Subtask 1: 0 / 13
• Subtask 2: 0 / 17
• Subtask 3: 0 / 21
• Subtask 4: 0 / 19
• Subtask 5: 0 / 30