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Submission #765611

# Submission time Handle Problem Language Result Execution time Memory
765611 2023-06-24T22:40:04 Z LeaRouse Shymbulak (IZhO14_shymbulak) C++14
50 / 100
 396 ms 13644 KB 
#include<bits/stdc++.h>
#define fastio ios_base::sync_with_stdio(0); cin.tie(0);
#define ll long long
#define ff first
#define ss second
using namespace std;
const int MAX = 5e4+5;
ll D[MAX],C[MAX],ans[MAX];
pair<int,int>dp[(1<<21)+5];
vector<int>v[MAX];
ll maxi=0;
void bfs(int x){
    memset(D,-1,sizeof(D));
    memset(C,0,sizeof(C));
    queue<int>q;
    D[x]=0; C[x] = 1; q.push(x); 
    while(!q.empty()){
        int u=q.front(); 
        q.pop();
        for(auto it:v[u]){
            if(D[it]==-1){
                D[it]=D[u]+1;   C[it]=C[u];
                ans[D[it]]+=C[u];   q.push(it);
            }
            else if(D[it]==D[u]+1){
                C[it]+=C[u];    ans[D[it]]+=C[u];
            }
            maxi=max(maxi,D[it]);
        }
    }
}

void go(){
    int n;  cin>>n;
    for(int i=0;i<n;i++){
        int a,b;    cin>>a>>b;
        v[a].push_back(b);
        v[b].push_back(a);
    }
    for(int i=0;i<n;i++){
        bfs(i+1);
    }
    cout<<ans[maxi]/2<<endl;
}

int main(){
    fastio;
    go();
    return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2260 KB Output is correct
2 Correct 1 ms 2260 KB Output is correct
3 Correct 2 ms 2268 KB Output is correct
4 Correct 2 ms 2260 KB Output is correct
5 Correct 1 ms 2260 KB Output is correct
6 Correct 2 ms 2268 KB Output is correct
7 Correct 2 ms 2260 KB Output is correct
8 Correct 1 ms 2260 KB Output is correct
9 Correct 1 ms 2260 KB Output is correct
10 Correct 2 ms 2260 KB Output is correct
11 Correct 2 ms 2260 KB Output is correct
12 Correct 2 ms 2260 KB Output is correct
13 Correct 4 ms 2260 KB Output is correct
14 Correct 10 ms 2308 KB Output is correct
15 Correct 10 ms 2276 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 2336 KB Output is correct
2 Correct 15 ms 2328 KB Output is correct
3 Correct 22 ms 2260 KB Output is correct
4 Correct 21 ms 2260 KB Output is correct
5 Correct 347 ms 2484 KB Output is correct
6 Correct 253 ms 2520 KB Output is correct
7 Correct 396 ms 2480 KB Output is correct
8 Correct 385 ms 2636 KB Output is correct
9 Correct 349 ms 2388 KB Output is correct
10 Correct 382 ms 2480 KB Output is correct

Subtask #3
0 / 50.0

# Verdict Execution time Memory Grader output
1 Runtime error 26 ms 13644 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -