Submission #71278

#	Time	Username	Problem	Language	Result	Execution time	Memory
71278		Kmcode	Simurgh (IOI17_simurgh)	C++14	Compilation error	0 ms	0 KiB

simurgh

#include<bits/stdc++.h>
//#include "books.h"
using namespace std;

//#include "simurgh.h"
//int count_common_roads(const std::vector<int>& r);

#define MAX 512
struct UF{
	int belong[MAX];
	int sz[MAX];
	int col[MAX];
	UF(){
		memset(belong,-1,sizeof(belong));
		for(int i=0;i<MAX;i++)sz[i]=1;
	}
	inline int root(int b){
		if(belong[b]==-1){
			return b;
		}
		return belong[b]=root(belong[b]);
	}
	void merge(int a,int b){
		a=root(a);
		b=root(b);
		if(a==b)return;
		if(a>b)swap(a,b);
		belong[a]=b;
		sz[b]+=sz[a];
	}
};
namespace solver{
	const int white=503;
	const int black=504;
	vector<pair<int,int> > v;
	vector<pair<int,int> > g[MAX];
	int id[MAX];
	int pr[MAX];
	int dep[MAX];
	UF uf;
	vector<int> road;
	vector<int> swa;
	
	inline void dfs(int b,int pr2=-1,int d=0){
		dep[b]=d;
			for(auto go:g[b]){
				if(go.first==pr2)continue;
				dfs(go.first,b,d+1);
				pr[go.first]=b;
				id[go.first]=go.second;
			}
	}
	int ini;
	int ask(){
		return count_common_roads(road);
	}
	void make_tree(){
		//random_shuffle(v.begin(),v.end());
		UF uf2;
		for(int i=0;i<v.size();i++){
			swa.push_back(-1);
			if(uf2.root(v[i].first)!=uf2.root(v[i].second)){
				uf2.merge(v[i].first,v[i].second);
				g[v[i].first].push_back(make_pair(v[i].second,i) );
				g[v[i].second].push_back(make_pair(v[i].first,i) );
				road.push_back(i);
				swa[i]=road.size()-1;
			}
		}
		ini=ask();
	}
	int query(int exp,int add){
		road[swa[exp]]=add;
		int z=ask();
		road[swa[exp]]=exp;
		return z-ini;
	}
	inline void check(int tree1,int tree2){
		int r1=uf.root(tree1);
		int r2=uf.root(tree2);
		if(r1==r2)return;
		if(r1==black||r1==white){
			if(r2==black||r2==white){
				return;
			}
		}
		int ret=query(tree1,tree2);
		if(ret==0){
			uf.merge(tree1,tree2);
			return;
		}
		if(ret>0){
			uf.merge(black,tree2);
			uf.merge(white,tree1);
			return;
		}
		uf.merge(black,tree1);
		uf.merge(white,tree2);
	}
	std::vector<int> find_roads(int n, std::vector<int> u1, std::vector<int> v1) {
		for(int i=0;i<u1.size();i++){
			v.push_back(make_pair(u1[i],v1[i]));
		}
		make_tree();
		if(ini==n-1){
			return road;
		}
		if(ini==0){
			for(int i=0;i<road.size();i++){
				uf.merge(road[i],white);
			}
		}
		dfs(0);
		for(int i=0;i<v.size();i++){
			if(dep[v[i].first]>dep[v[i].second])swap(v[i].first,v[i].second);
			if(pr[v[i].second]==v[i].first)continue;
			int a=v[i].first;
			int b=v[i].second;
			while(a!=b){
				if(dep[a]<dep[b]){
					check(id[b],i);
					b=pr[b];
				}
				else{
					check(id[a],i);
					a=pr[a];
				}
			}
		}
		vector<int> ans;
		for(int i=0;i<v.size();i++){
			if(uf.root(i)==black){
				ans.push_back(i);
			}
		}
		return ans;
	}
	
}

Compilation message (stderr)

simurgh.cpp: In function 'int solver::ask()':
simurgh.cpp:55:10: error: 'count_common_roads' was not declared in this scope
   return count_common_roads(road);
          ^~~~~~~~~~~~~~~~~~
simurgh.cpp: In function 'void solver::make_tree()':
simurgh.cpp:60:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<v.size();i++){
               ~^~~~~~~~~
simurgh.cpp: In function 'std::vector<int> solver::find_roads(int, std::vector<int>, std::vector<int>)':
simurgh.cpp:101:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<u1.size();i++){
               ~^~~~~~~~~~
simurgh.cpp:109:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i=0;i<road.size();i++){
                ~^~~~~~~~~~~~
simurgh.cpp:114:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<v.size();i++){
               ~^~~~~~~~~
simurgh.cpp:131:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<v.size();i++){
               ~^~~~~~~~~