제출 #72651

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
72651		mhnd	Simurgh (IOI17_simurgh)	C++14	0 / 100	3 ms	600 KiB

simurgh

#include "simurgh.h"
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
const int N = 2e5+50;
const int oo = 1e9;
const int mod = 1e9+7;

vector<pair<int,int>> g[501];
bool used[510][510],taken[501];

vector<int> find_roads(int n, vector<int> U, vector<int> V) {
	for(int i=0;i<U.size();i++){
		g[U[i]].push_back({V[i],i});
		g[V[i]].push_back({U[i],i});
	}
	vector<int> ans;
	for(int i=0;i<n;i++){
		for(int j=0;j<g[i].size();j++){
			int v = g[i][j].first;
			int w = g[i][j].second;
			if(taken[i] && taken[v])continue;
			taken[i]=taken[v]=1;
			ans.push_back(w);
		}
	}
	int lst = count_common_roads(ans);
	for(int i=0;i<ans.size();i++){
		int cur = 0;
		taken[U[ans[i]]]=taken[V[ans[i]]]=0;
		bool f=0;
		for(int j=g[U[ans[i]]].size()-1;j>=0;j--){
			int v = g[U[ans[i]]][j].first;
			int u = U[ans[i]];
			if(taken[u] && taken[v] || g[U[ans[i]]][j].second == i)continue;
			int tmp = ans[i];
			ans[i] = g[U[ans[i]]][j].second;
			cur = count_common_roads(ans);
			if(cur > lst){
				taken[V[tmp]]=taken[U[tmp]]=0;
				taken[v]=taken[u]=1;
				f=1;
				break;
			}
			ans[i] = tmp;
		}
		if(f)continue;
		for(int j=g[V[ans[i]]].size()-1;j>=0;j--){
			int v = g[V[ans[i]]][j].first;
			int u = V[ans[i]];
			if(taken[u] && taken[v] || g[V[ans[i]]][j].second == i)continue;
			int tmp = ans[i];
			ans[i] = g[V[ans[i]]][j].second;
			if(i==ans.size()-1)cout << ans[i] << endl;
			cur = count_common_roads(ans);
			if(cur > lst){
				taken[V[tmp]]=taken[U[tmp]]=0;
				taken[v]=taken[u]=1;
				f=1;
				break;
			}
			ans[i] = tmp;
		}
		if(f)continue;
		taken[U[ans[i]]]=taken[V[ans[i]]]=1;
	}
	return ans;
}

컴파일 시 표준 에러 (stderr) 메시지

simurgh.cpp: In function 'std::vector<int> find_roads(int, std::vector<int>, std::vector<int>)':
simurgh.cpp:16:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<U.size();i++){
              ~^~~~~~~~~
simurgh.cpp:22:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j=0;j<g[i].size();j++){
               ~^~~~~~~~~~~~
simurgh.cpp:31:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<ans.size();i++){
              ~^~~~~~~~~~~
simurgh.cpp:38:16: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    if(taken[u] && taken[v] || g[U[ans[i]]][j].second == i)continue;
       ~~~~~~~~~^~~~~~~~~~~
simurgh.cpp:54:16: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    if(taken[u] && taken[v] || g[V[ans[i]]][j].second == i)continue;
       ~~~~~~~~~^~~~~~~~~~~
simurgh.cpp:57:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if(i==ans.size()-1)cout << ans[i] << endl;
       ~^~~~~~~~~~~~~~

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