제출 #112283

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
112283		figter001	철인 이종 경기 (APIO18_duathlon)	C++17	5 / 100	1084 ms	16888 KiB

count_triplets

#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];
}

/*
ll get(int n,int s,int e,int l,int r){
	pro(n,s,e);
	if(s > r || e < l)
		return 0;
	if(s >= l && e <= r)
		return seg[n];
	return get(n*2,s,(s+e)/2,l,r) + get(n*2+1,(s+e)/2+1,e,l,r);
}
*/
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(){
	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 > 50){
		ans = n * (n-1) * (n-2);
	}else if(n == m+1){
		dfs(1,0,0);
		calc(1,0);
	}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 assert(0);

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

컴파일 시 표준 에러 (stderr) 메시지

count_triplets.cpp: In function 'int main()':
count_triplets.cpp:95:7: 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:98:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&u,&v);
   ~~~~~^~~~~~~~~~~~~~

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