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답안 #99847

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
99847 2019-03-07T19:51:23 Z TadijaSebez 철인 이종 경기 (APIO18_duathlon) C++11
23 / 100
 257 ms 32120 KB 
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
const int N=200050;
vector<int> G[N],E[N];
void AddEdge(int u, int v){ E[u].pb(v);E[v].pb(u);}
int cnt,disc[N],low[N],tid,n,csz[N];
bool in[N];
stack<int> s;
void Tarjan(int u)
{
	disc[u]=low[u]=++tid;
	in[u]=1;s.push(u);
	for(int v:G[u])
	{
		if(!disc[v])
		{
			Tarjan(v);
			low[u]=min(low[u],low[v]);
			if(low[v]>=disc[u])
			{
				++cnt;
				AddEdge(u,cnt);
				csz[cnt]++;
				int h;
				do
				{
					h=s.top();
					s.pop();
					in[h]=0;
					AddEdge(h,cnt);
					csz[cnt]++;
				}while(h!=v);
			}
		}
		else if(in[v]) low[u]=min(low[u],disc[v]);
	}
}
ll ans;
int sz[N],dep[N],up[N];
void DFSSZ(int u, int p)
{
	sz[u]=u<=n;
	dep[u]=dep[p]+(u<=n);
	up[u]=n;
	for(int v:E[u]) if(v!=p) DFSSZ(v,u),sz[u]+=sz[v],up[u]-=sz[v];
}
int rt[N];
void Solve(int u, int p, int root)
{
	for(int v:E[u]) if(v!=p) Solve(v,u,root);
	ll all=(ll)sz[u]*(sz[u]-1);
	int ch=0;
	for(int v:E[u]) if(v!=p) all-=(ll)sz[v]*(sz[v]-1),ch+=csz[v]-1;
	if(u<=n) ans+=(ll)(sz[root]-1)*dep[p]*2;
	if(u<=n) ans-=all*(dep[u]+dep[p]);
	else ans-=all*(dep[u]+dep[p]-1);
	//printf("all:%lld\n",all);
	/*if(u<=n)
	{
		if(p) ans-=(ll)sz[u]*(csz[p]-1)*2*2;
		ans-=(ll)up[u]*ch*2*2;
		//printf("u:%i ans:%lld sz:%i up:%i dep:%i ch:%i csz[p]:%i\n",u,ans,sz[u],up[u],dep[u],ch,csz[p]);
	}*/
	if(u>n)
	{
		//ans-=(ll)sz[root]*(csz[u]-1)*4;
		ans+=(ll)(sz[root]-csz[u])*(csz[u]-1)*(csz[u]-2)*2;
		ans+=(ll)csz[u]*(csz[u]-1)*(csz[u]-2);
		for(int v:E[u]) if(v!=p)
		{
			ans-=(ll)(sz[u]-sz[v]);
			ans+=(ll)(sz[root]-sz[v]-csz[u]+1)*(sz[v]-1)*(csz[u]-2);
		}
		ans+=(ll)(sz[root]-up[p]-csz[u]+1)*(up[p]-1)*(csz[u]-2);
	}
	rt[u]=root;
	//else printf("u:%i ans:%i\n",u,ans);
}
int main()
{
	int m,u,v;
	scanf("%i %i",&n,&m);
	cnt=n;
	for(int i=1;i<=m;i++) scanf("%i %i",&u,&v),G[u].pb(v),G[v].pb(u);
	vector<int> root;
	for(int i=1;i<=n;i++) if(!disc[i]) Tarjan(i),root.pb(i);
	for(int i:root) DFSSZ(i,0),Solve(i,0,i);
	//for(int i=n+1;i<=cnt;i++) ans+=(ll)csz[i]*(csz[i]-1)*sz[rt[i]]*2-(ll)csz[i]*(csz[i]-1)*(csz[i]-2);
	printf("%lld\n",ans);
	return 0;
}

Compilation message

count_triplets.cpp: In function 'int main()':
count_triplets.cpp:84:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%i %i",&n,&m);
  ~~~~~^~~~~~~~~~~~~~~
count_triplets.cpp:86:55: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=1;i<=m;i++) scanf("%i %i",&u,&v),G[u].pb(v),G[v].pb(u);
                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~

Subtask #1
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 10 ms 9728 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 10 ms 9728 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 149 ms 29832 KB Output is correct
2 Correct 126 ms 29936 KB Output is correct
3 Incorrect 156 ms 27636 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 9984 KB Output is correct
2 Correct 11 ms 9856 KB Output is correct
3 Correct 14 ms 9856 KB Output is correct
4 Correct 13 ms 9984 KB Output is correct
5 Correct 11 ms 9984 KB Output is correct
6 Correct 12 ms 9984 KB Output is correct
7 Correct 13 ms 9984 KB Output is correct
8 Correct 14 ms 9984 KB Output is correct
9 Correct 12 ms 9984 KB Output is correct
10 Correct 12 ms 9856 KB Output is correct
11 Correct 12 ms 9856 KB Output is correct
12 Correct 10 ms 9856 KB Output is correct
13 Correct 11 ms 9856 KB Output is correct
14 Correct 10 ms 9856 KB Output is correct
15 Correct 10 ms 9856 KB Output is correct
16 Correct 10 ms 9856 KB Output is correct
17 Correct 11 ms 9856 KB Output is correct
18 Correct 10 ms 9856 KB Output is correct
19 Correct 10 ms 9856 KB Output is correct
20 Correct 10 ms 9856 KB Output is correct

Subtask #5
13.0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Correct 204 ms 23684 KB Output is correct
2 Correct 176 ms 23672 KB Output is correct
3 Correct 180 ms 23740 KB Output is correct
4 Correct 179 ms 23672 KB Output is correct
5 Correct 182 ms 23672 KB Output is correct
6 Correct 257 ms 32120 KB Output is correct
7 Correct 212 ms 29304 KB Output is correct
8 Correct 215 ms 27896 KB Output is correct
9 Correct 212 ms 26520 KB Output is correct
10 Correct 180 ms 23740 KB Output is correct
11 Correct 183 ms 23800 KB Output is correct
12 Correct 175 ms 23672 KB Output is correct
13 Correct 242 ms 23800 KB Output is correct
14 Correct 160 ms 23160 KB Output is correct
15 Correct 145 ms 22520 KB Output is correct
16 Correct 96 ms 19956 KB Output is correct
17 Correct 147 ms 24320 KB Output is correct
18 Correct 150 ms 24456 KB Output is correct
19 Correct 148 ms 24456 KB Output is correct
20 Correct 135 ms 24312 KB Output is correct

Subtask #6
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 9856 KB Output is correct
2 Correct 11 ms 9856 KB Output is correct
3 Incorrect 11 ms 9856 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 188 ms 23716 KB Output is correct
2 Correct 223 ms 23652 KB Output is correct
3 Incorrect 187 ms 22776 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #8
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 10 ms 9728 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 10 ms 9728 KB Output isn't correct
2 Halted 0 ms 0 KB -