oj.uz

Submission #368941

# Submission time Handle Problem Language Result Execution time Memory
368941 2021-02-20T08:15:24 Z YJU Duathlon (APIO18_duathlon) C++14
0 / 100
 170 ms 66144 KB 
#include<bits/stdc++.h>
#pragma GCC optimize("unroll-loops,no-stack-protector,Ofast")
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> pll;
const ll MOD=1e9+7;
const ll MOD2=998244353;
const ll N=1e6+5;
const ld pi=acos(-1);
const ll INF=(1LL<<60);
#define SQ(i) ((i)*(i))
#define REP(i,n) for(ll i=0;i<n;i++)
#define REP1(i,n) for(ll i=1;i<=n;i++)
#define pb push_back
#define mp make_pair
#define X first
#define Y second
#define setp setprecision
#define lwb lower_bound
#define SZ(_a) (ll)_a.size()

ll n,m,x,y;
ll low[N],depth[N],cnt=0,ptr,w[N],ans,sz[N];
vector<ll> G[N],v[N];

ll stk[N],now;

void DFS1(ll nd,ll pa){
	++cnt;
	low[nd]=depth[nd]=depth[pa]+1;
	stk[++now]=nd;
	for(ll i:v[nd]){
		if(i==pa)continue;
		if(depth[i]){
			low[nd]=min(low[nd],depth[i]);
		}else{
			//
			//
			DFS1(i,nd);
			if(low[i]==depth[nd]){
				//cout<<"FIND BCC\n";
				++ptr;
				while(stk[now]!=nd){
					//cout<<stk[now]<<" ";
					++w[ptr];w[stk[now]]=-1;
					G[stk[now]].pb(ptr);
					G[ptr].pb(stk[now]);
					--now;
				}
				//cout<<stk[now]<<"\n";
				++w[ptr];w[stk[now]]=-1;
				G[stk[now]].pb(ptr);
				G[ptr].pb(stk[now]);
			}
			low[nd]=min(low[nd],low[i]);
		}
	}
}

void DFS2(ll nd,ll pa){
	sz[nd]=(nd<=n?1:0);
	for(auto i:G[nd]){
		if(i==pa)continue;
		DFS2(i,nd);
		ans+=2*w[nd]*sz[nd]*sz[i];
		sz[nd]+=sz[i];
	}
	ans+=2*w[nd]*sz[nd]*(cnt-sz[nd]);
}

int main(){
	ios_base::sync_with_stdio(0);cin.tie(0);
	cin>>n>>m;
	ptr=n;
	REP(i,m){
		cin>>x>>y;
		v[x].pb(y),v[y].pb(x);
	}
	REP1(i,n){
		if(!depth[i]){
			cnt=now=0;
			DFS1(i,0);
			DFS2(i,0);
		}
	}
	cout<<ans<<"\n";
	return 0;
}

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 37 ms 47340 KB Output is correct
2 Correct 29 ms 47340 KB Output is correct
3 Correct 29 ms 47340 KB Output is correct
4 Correct 30 ms 47340 KB Output is correct
5 Correct 29 ms 47472 KB Output is correct
6 Correct 36 ms 47400 KB Output is correct
7 Incorrect 33 ms 47468 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 37 ms 47340 KB Output is correct
2 Correct 29 ms 47340 KB Output is correct
3 Correct 29 ms 47340 KB Output is correct
4 Correct 30 ms 47340 KB Output is correct
5 Correct 29 ms 47472 KB Output is correct
6 Correct 36 ms 47400 KB Output is correct
7 Incorrect 33 ms 47468 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #3
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 149 ms 66132 KB Output is correct
2 Correct 170 ms 66144 KB Output is correct
3 Incorrect 135 ms 59928 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 32 ms 47340 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 109 ms 53484 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 15.0

# Verdict Execution time Memory Grader output
1 Incorrect 38 ms 47340 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 96 ms 53484 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 37 ms 47340 KB Output is correct
2 Correct 29 ms 47340 KB Output is correct
3 Correct 29 ms 47340 KB Output is correct
4 Correct 30 ms 47340 KB Output is correct
5 Correct 29 ms 47472 KB Output is correct
6 Correct 36 ms 47400 KB Output is correct
7 Incorrect 33 ms 47468 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 37 ms 47340 KB Output is correct
2 Correct 29 ms 47340 KB Output is correct
3 Correct 29 ms 47340 KB Output is correct
4 Correct 30 ms 47340 KB Output is correct
5 Correct 29 ms 47472 KB Output is correct
6 Correct 36 ms 47400 KB Output is correct
7 Incorrect 33 ms 47468 KB Output isn't correct
8 Halted 0 ms 0 KB -