oj.uz

답안 #66337

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
66337 2018-08-10T09:07:46 Z MrTEK Zagrade (COI17_zagrade) C++14
0 / 100
 2 ms 488 KB 
#include <bits/stdc++.h>

using namespace std;
#define mp make_pair
#define pb push_back
#define len(a) (int)a.size()
#define fi first
#define sc second
#define d1(w) cerr<<#w<<":"<<w<<endl;
#define d2(w,c) cerr<<#w<<":"<<w<<" "<<#c<<":"<<c<<endl;
#define d3(w,c,z) cerr<<#w<<":"<<w<<" "<<#c<<":"<<c<<" "<<#z<<":"<<z<<endl;
#define left ind+ind
#define right ind+ind+1
#define mid (l+r)/2
#define FAST_IO ios_base::sync_with_stdio(false);
#define endl '\n'

typedef long long int ll;

const int maxn = 620;
const long long LINF = 1e18;
const int LOG = 31;
const int INF = 1e9;
const int N = 30;
const int M = 25;
const int SQ = 350;
const int MOD = 998244353;

typedef pair <int,int> pii;

vector <int> ed[N],vec[N],vec2[N];

long long int ans = 0;

int n,sub[N],a[N],vis[N],mark[N],mark2[N];

int calc(int cur,int back = -1) {
	sub[cur] = 0;
	for (auto i : ed[cur])
		if (i != back && !vis[i])
			sub[cur] += calc(i,cur);
	return ++sub[cur];
}

int find(int cur,int back,int size) {
	for (auto i : ed[cur])
		if (i != back && !vis[i] && sub[i] > size / 2)
			return find(i,cur,size);
	return cur;
}

void dfs(int cur,int back) {
	vec[cur].clear();
	vec2[cur].clear();
	for (auto i : ed[cur]) {
		if (i == back || vis[i] == 1) continue;
		dfs(i,cur);
		for (auto j : vec[i]) if(j + a[cur] > 0) vec[cur].pb(j + a[cur]);
		for (auto j : vec2[i]) if(j - a[cur] > 0) vec2[cur].pb(j - a[cur]);
	}
	if (a[cur] > 0) vec[cur].pb(a[cur]);
	else vec2[cur].pb(-a[cur]);
}

void dfs2(int cur,int back,int sm,int mn,int sm2,int mn2) {
	sm += a[cur];
	sm2 -= a[cur];
	mn = min(mn,sm);
	mn2 = min(mn2,sm2);
	if (sm == mn && sm <= 0) ans += mark[-sm];
	if (sm2 == mn2 && sm2 <= 0) ans += mark2[-sm2];
	for (auto i : ed[cur]) {
		if (i == back || vis[i] == 1) continue;
		dfs2(i,cur,sm,mn,sm2,mn2);
	}
}

void solve(int cur = 1) {

	int cen = find(cur,-1,calc(cur));

	memset(mark,0,sizeof mark);
	memset(mark2,0,sizeof mark2);

	vector <int> v;

	vis[cen] = 1;

	for (auto i : ed[cen]) {
		if (vis[i]) continue;
		dfs2(i,-1,0,INF,0,INF);
		dfs(i,-1);
		for (auto j : vec[i]) if (j + a[cen] >= 0) {mark[j + a[cen]]++; if (j + a[cen] == 0) ans++;} 
		for (auto j : vec2[i]) if (j - a[cen] >= 0) { mark2[j - a[cen]]++; if (j - a[cen] == 0) ans++;}
	}


	for (auto i : ed[cen])
		if (!vis[i])
			solve(i);
}

int main() {

	scanf("%d",&n);

	for (int i = 1 ; i <= n; i++) {
		char c;
		scanf(" %c",&c);
		if (c == '(') a[i] = 1;
		else a[i] = -1;
	}

	for (int i = 1 ; i < n ; i++) {
		int u,v;
		scanf("%d %d",&u,&v);
		ed[u].pb(v);
		ed[v].pb(u);
	}

	solve();

	printf("%lld\n",ans);

	return 0 ;
}

Compilation message

zagrade.cpp: In function 'int main()':
zagrade.cpp:105:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
zagrade.cpp:109:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf(" %c",&c);
   ~~~~~^~~~~~~~~~
zagrade.cpp:116:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d",&u,&v);
   ~~~~~^~~~~~~~~~~~~~~

Subtask #1
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 376 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 488 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 60.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 376 KB Output isn't correct
2 Halted 0 ms 0 KB -