Submission #257646

#	Time	Username	Problem	Language	Result	Execution time	Memory
257646		igm_igm	Mag (COCI16_mag)	C++14	108 / 120	865 ms	228980 KiB

mag

#include <bits/stdc++.h>
using namespace std;
typedef int64_t llo;
#define mp make_pair
#define pb push_back
#define a first 
#define b second
#define all(x) x.begin(),x.end()
void setIO(string s){
	freopen((s+".in").c_str(),"r",stdin);
	freopen((s+".out").c_str(),"w",stdout);
}

pair<llo,llo> ans;
vector<llo> adj[1000001];
llo it[1000001];
llo dp[1000001];
llo n;
void remin(pair<llo,llo> xx){
	llo yo=__gcd(xx.a,xx.b);
	xx.a/=yo;
	xx.b/=yo;
	if(xx.a*ans.b<xx.b*ans.a){
		ans=xx;
	}
}
void dfs(llo no,llo par=-1,llo co=0){
	vector<llo> kk;
	kk.pb(co);
	co+=1;
	if(it[no]>1){
		co=0;
	}
	llo ma=0;
	for(auto j:adj[no]){
		if(j==par){
			continue;
		}
		dfs(j,no,co);
		ma=max(ma,dp[j]);
		kk.pb(dp[j]);
	}
	sort(all(kk));
	reverse(all(kk));
	llo cc=0;
	for(llo i=0;i<kk.size();i++){
		if(i==2){
			break;
		}
		cc+=kk[i];
	}
	remin({it[no],1+cc});
	if(it[no]==1){
		dp[no]=ma+1;
	}

}


int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cin>>n;
	for(llo i=0;i<n-1;i++){
		llo aa,bb;
		cin>>aa>>bb;
		aa--;
		bb--;
		adj[aa].pb(bb);
		adj[bb].pb(aa);
	}
	for(llo i=0;i<n;i++){
		cin>>it[i];
	}
	ans={it[0],1};
	dfs(0);
	cout<<ans.a<<"/"<<ans.b<<endl;



	return 0;
}

Compilation message (stderr)

mag.cpp: In function 'void dfs(llo, llo, llo)':
mag.cpp:47:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(llo i=0;i<kk.size();i++){
              ~^~~~~~~~~~
mag.cpp: In function 'void setIO(std::__cxx11::string)':
mag.cpp:11:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  freopen((s+".in").c_str(),"r",stdin);
  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mag.cpp:12:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  freopen((s+".out").c_str(),"w",stdout);
  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 12 / 12
• Subtask 2: 12 / 12
• Subtask 3: 0 / 12
• Subtask 4: 12 / 12
• Subtask 5: 12 / 12
• Subtask 6: 12 / 12
• Subtask 7: 12 / 12
• Subtask 8: 12 / 12
• Subtask 9: 12 / 12
• Subtask 10: 12 / 12