Submission #1076132

#	Time	Username	Problem	Language	Result	Execution time	Memory
1076132		Abito	Simurgh (IOI17_simurgh)	C++17	30 / 100	3032 ms	3508 KiB

simurgh

#include "simurgh.h"
#include <bits/stdc++.h>
#define pb push_back
#define ask count_common_roads
using namespace std;
const int N=2005;
int par[N],sz[N];
bool in[N];
int getpar(int x){
	if (x==par[x]) return x;
	return par[x]=getpar(par[x]);
}
bool link(int x,int y){
	x=getpar(x);
	y=getpar(y);
	if (x==y) return 0;
	if (sz[x]>sz[y]) swap(x,y);
	sz[y]+=sz[x];
	par[x]=y;
	return 1;
}
std::vector<int> find_roads(int n, std::vector<int> u, std::vector<int> v) {
	int m=u.size();
	for (int i=0;i<m;i++) u[i]++,v[i]++;
	for (int i=1;i<=n;i++) sz[i]=1,par[i]=i;
	vector<int> r;
	for (int i=0;i<m;i++){
		if (link(u[i],v[i])) r.pb(i),in[i]=1;
	}
	int ans=ask(r);
	while (ans<n-1){
		bool op=0;
		for (int i=0;i<n-1 && !op;i++){
			for (int j=0;j<m && !op;j++){
				if (in[j]) continue;
				vector<int> t;
				for (int k=0;k<n-1;k++){
					if (k==i) continue;
					t.pb(r[k]);
				}
				t.pb(j);
				for (int i=1;i<=n;i++) sz[i]=1,par[i]=i;
				int tree=0;
				for (auto x:t) tree+=link(u[x],v[x]);
				if (tree!=n-1) continue;
				int h=ask(t);
				if (h<=ans) continue;
				ans=h;
				swap(r,t);
				op=1;
				break;
			}
		}
	}
	return r;
}

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