oj.uz

답안 #112286

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
112286 2019-05-18T12:49:49 Z figter001 철인 이종 경기 (APIO18_duathlon) C++17
0 / 100
 6 ms 4992 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
const int nax = 2e5;

vector<int> g[nax];
int seg[4*nax],lazy[4*nax],fr[nax],to[nax],id[nax];
int T,n,m;
ll ans;

void pro(int n,int s,int e){
	seg[n] += lazy[n]*(e-s+1);
	if(s != e){
		lazy[n*2] += lazy[n];
		lazy[n*2+1] += lazy[n];
	}
	lazy[n] = 0;
}

void update(int n,int s,int e,int l,int r,int val){
	pro(n,s,e);
	if(s > r || e < l)
		return;
	if(s >= l && e <= r){
		lazy[n] += val;
		pro(n,s,e);
		return;
	}
	update(n*2,s,(s+e)/2,l,r,val);
	update(n*2+1,(s+e)/2+1,e,l,r,val);
	seg[n] = seg[n*2] + seg[n*2+1];
}

void dfs(int u,int p,int d){
	id[u] = fr[u] = ++T;

	update(1,1,n,T,T,d);

	for(int v : g[u]){
		if(v == p)
			continue;
		dfs(v,u,d+1);
	}

	to[u] = T;
}

void calc(int u,int p){
	ans += seg[1] - n + 1;
	for(int v : g[u]){
		if(v == p)
			continue;
		update(1,1,n,1,n,1);
		update(1,1,n,fr[v],to[v],-2);

		calc(v,u);

		update(1,1,n,1,n,-1);
		update(1,1,n,fr[v],to[v],2);
	}

}

const int kax = 100;

bool can[kax],vis[kax];

int count(int u,int t){
	if(u == t)return 1;
	vis[u] = 1;
	for(int v : g[u]){
		if(vis[v])continue;
		// cout << v << ' ' << u << endl;
		can[u] |= count(v,t);
	}
	vis[u] = 0;
	return can[u];
}

int main(){
	#ifndef ONLINE_JUDGE
		freopen("input.txt","r",stdin);
	#endif
	scanf("%d%d",&n,&m);
	for(int i=0;i<m;i++){
		int u,v;
		scanf("%d%d",&u,&v);
		g[u].push_back(v);
		g[v].push_back(u);
	}
	if(n == m && n > 10){
		ans = n * 1ll * (n-1) * (n-2);
	}else if(n <= 50){
		for(int i=1;i<=n;i++){
			for(int j=1;j<=n;j++){
				if(i == j)continue;
				memset(can,0,sizeof(can));
				// cout << i << ' ' << j << endl;
				count(i,j);
				// cout << i << ' ' << j << endl;
				for(int x=1;x<=n;x++){
					if(x == i || x == j)continue;
					// if(can[x])cout << i << ' ' << x << ' ' << j << endl;
					ans += can[x];
				}
			}
		}
	}else{
		dfs(1,0,0);
		calc(1,0);
	}

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

Compilation message

count_triplets.cpp: In function 'int main()':
count_triplets.cpp:86:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen("input.txt","r",stdin);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
count_triplets.cpp:88:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
  ~~~~~^~~~~~~~~~~~~~
count_triplets.cpp:91:8: 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 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 5 ms 4992 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 5 ms 4992 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 5 ms 4992 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 5 ms 4992 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 5 ms 4992 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 5 ms 4992 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 6 ms 4992 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 5 ms 4992 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 5 ms 4992 KB Output isn't correct
2 Halted 0 ms 0 KB -