oj.uz

Submission #771495

# Submission time Handle Problem Language Result Execution time Memory
771495 2023-07-03T05:14:42 Z ttamx One-Way Streets (CEOI17_oneway) C++14
0 / 100
 2 ms 2644 KB 
#include<bits/stdc++.h>

using namespace std;

const int N=1e5+5;

int n,m,p; 
int val[N],val2[N];
char ans[N];
vector<pair<int,int>> adj[N];
bool vis[N];

void dfs(int u,int p){
    vis[u]=true;
    for(auto [v,i]:adj[u]){
        if(i==-p)continue;
        if(!vis[v]){
            dfs(v,i);
            if(val2[v]>0||val[v]==0)ans[abs(i)]='B';
            else ans[abs(i)]=((val[v]<0)^(i>0))?'L':'R';
            val[u]+=val[v];
            val2[u]+=val2[v];
        }else{
            ans[abs(i)]='B';
            val2[u]++;
            val2[v]--;
        }
    }
}

int main(){
    cin.tie(nullptr)->sync_with_stdio(false);
    cin >> n >> m;
    for(int i=1;i<=m;i++){
        int u,v;
        cin >> u >> v;
        adj[u].emplace_back(v,i);
        adj[v].emplace_back(u,-i);
    }
    cin >> p;
    for(int i=1;i<=p;i++){
        int u,v;
        cin >> u >> v;
        val[u]++;
        val[v]--;
    }
    dfs(1,0);
    for(int i=1;i<=m;i++)cout << ans[i];
}

Compilation message

oneway.cpp: In function 'void dfs(int, int)':
oneway.cpp:15:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   15 |     for(auto [v,i]:adj[u]){
      |              ^

Subtask #1
0 / 30.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 2644 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 30.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 2644 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 2644 KB Output isn't correct
2 Halted 0 ms 0 KB -