oj.uz

답안 #257678

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
257678 2020-08-04T14:34:37 Z igm_igm Mag (COCI16_mag) C++14
72 / 120
 647 ms 250920 KB 
#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];
vector<pair<llo,llo>> kk[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){
	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[no].pb({dp[j],j});
	}
	sort(all(kk[no]));
	reverse(all(kk[no]));
	llo cc=0;
	for(llo i=0;i<kk[no].size();i++){
		if(i==2){
			break;
		}
		cc+=kk[no][i].a;
	}
	remin({it[no],1+cc});
	if(it[no]==1){
		dp[no]=ma+1;
	}
}
void dfs2(llo no,llo par=-1,llo co=0){
	llo kp=co+1;
	if(kk[no].size()){
		kp+=kk[no][0].a;
	}
	remin({it[no],kp});
	if(it[no]==1){
		co=0;
	}
	else{
		co+=1;
	}
	llo ma=0;
	for(auto j:adj[no]){
		if(j==par){
			continue;
		}
		llo se=0;
		if(it[no]==1){
			se=max(se,co);
			llo su=1;
			for(int i=0;i<2;i++){
				if(i==kk[no].size()){
					break;
				}
				if(kk[no][i].b==j){
					continue;
				}
				su+=kk[no][i].a;
				break;
			}
			se=max(se,su);
		}
		dfs2(j,no,se);
	}


}




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);
	dfs2(0);
	cout<<ans.a<<"/"<<ans.b<<endl;



	return 0;
}

Compilation message

mag.cpp: In function 'void dfs(llo, llo, llo)':
mag.cpp:46:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(llo i=0;i<kk[no].size();i++){
              ~^~~~~~~~~~~~~~
mag.cpp: In function 'void dfs2(llo, llo, llo)':
mag.cpp:79:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(i==kk[no].size()){
        ~^~~~~~~~~~~~~~~
mag.cpp:69:6: warning: unused variable 'ma' [-Wunused-variable]
  llo ma=0;
      ^~
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
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 29 ms 47360 KB Output is correct
2 Correct 26 ms 47352 KB Output is correct

Subtask #2
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 26 ms 47360 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 490 ms 161144 KB Output is correct

Subtask #4
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 26 ms 47360 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 628 ms 245780 KB Output isn't correct

Subtask #6
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 544 ms 126236 KB Output is correct
2 Correct 403 ms 105952 KB Output is correct

Subtask #7
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 505 ms 122504 KB Output is correct
2 Correct 130 ms 56568 KB Output is correct
3 Incorrect 647 ms 250920 KB Output isn't correct

Subtask #8
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 135 ms 56056 KB Output is correct
2 Correct 542 ms 126876 KB Output is correct
3 Correct 492 ms 87544 KB Output is correct

Subtask #9
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 482 ms 119908 KB Output is correct
2 Correct 531 ms 123976 KB Output is correct

Subtask #10
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 533 ms 127480 KB Output is correct
2 Correct 459 ms 87444 KB Output is correct