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Submission #56073

# Submission time Handle Problem Language Result Execution time Memory
56073 2018-07-09T20:22:58 Z IvanC One-Way Streets (CEOI17_oneway) C++17
60 / 100
 3000 ms 24472 KB 
#include <bits/stdc++.h>
using namespace std;

typedef pair<int,int> ii;

const int MAXN = 1e5 + 10;

vector<int> grafo[MAXN],tree[MAXN],procurar1[MAXN],procurar2[MAXN];
vector<ii> pares;
map<ii,int> cjt;
int low[MAXN],num[MAXN],jafoi[MAXN],dfsNum,compId[MAXN],compAtual;
int e1[MAXN],e2[MAXN],e3[MAXN],e4[MAXN],ehponte[MAXN];
int tipo1[MAXN],tipo2[MAXN],altura[MAXN],liga[MAXN],pai[MAXN],N,M,K;

void dfs_tarjan(int v,int aresta){
  num[v] = ++dfsNum;
  low[v] = dfsNum;
  for(int i : grafo[v]){
    if(i == aresta) continue;
    int u = (e1[i] != v) ? (e1[i]) : (e2[i]);
    if(num[u] == 0){
      dfs_tarjan(u,i);
      if(low[u] > num[v]) ehponte[i] = 1;
      low[v] = min(low[v],low[u]);
    }
    else{
      low[v] = min(low[v],num[u]);
    }
  }
}

void dfs_bridge(int v,int aresta){
  jafoi[v] = 1;
  for(int i : grafo[v]){
    if(i == aresta) continue;
    int u = (e1[i] != v) ? (e1[i]) : (e2[i]);
    if(jafoi[u]) continue;
    if(ehponte[i]){
      compAtual++;
      compId[u] = compAtual;
      dfs_bridge(u,i);
    }
    else{
      compId[u] = compId[v];
      dfs_bridge(u,i);
    }
  }
}

void dfs1(int v,int p){
  //printf("DFS\n");
  for(int i : tree[v]){
    int u = (e3[i] != v) ? (e3[i]) : (e4[i]);
    if(u == p) continue;
    pai[u] = v;
    liga[u] = i;
    altura[u] = altura[v] + 1;
    dfs1(u,v);
  }
}

void LCA(int u,int v){
  while(u != v){
    //printf("U %d V %d\n",u,v);
    if(altura[u] >= altura[v]){
      //printf("Tipo1 %d %d\n",u,liga[u]);
      tipo1[liga[u]]++;
      u = pai[u];
    }
    else{
      //printf("Tipo2 %d %d\n",v,liga[v]);
      tipo2[liga[v]]++;
      v = pai[v];
    }
  }
}

int main(){
  scanf("%d %d",&N,&M);
  for(int i = 1;i<=M;i++){
    scanf("%d %d",&e1[i],&e2[i]);
    grafo[e1[i]].push_back(i);
    grafo[e2[i]].push_back(i);
  }
  scanf("%d",&K);
  for(int i = 1;i<=K;i++){
    int u,v;
    scanf("%d %d",&u,&v);
    pares.push_back(ii(u,v));
  }
  for(int i = 1;i<=N;i++){
    if(num[i] != 0) continue;
    dfs_tarjan(i,-1);
    compAtual++;
    compId[i] = compAtual;
    dfs_bridge(i,-1);
  }
  //printf("Pontes\n");
  for(int i = 1;i<=M;i++){
    if(!ehponte[i]) continue;
    e3[i] = compId[e1[i]];
    e4[i] = compId[e2[i]];
    //printf("%d %d %d %d\n",e1[i],e2[i],e3[i],e4[i]);
    tree[e3[i]].push_back(i);
    tree[e4[i]].push_back(i);
  }

  for(int  i = 1;i <= compAtual;i++){
    if(altura[i] != 0) continue;
    //printf("DFS1 %d\n",i);
    altura[i] = 1;
    dfs1(i,-1);
    //printf("Foi\n");
  }

  for(ii davez : pares){
    int u = compId[davez.first],v = compId[davez.second];
    if(u == v) continue;
    LCA(u,v);
  }

  for(int i = 1;i<=M;i++){
    if(ehponte[i] == 0){
      printf("B");
    }
    else if(tipo1[i]){
      if(altura[e3[i]] > altura[e4[i]]) printf("R");
      else printf("L");
    }
    else if(tipo2[i]){
      if(altura[e3[i]] < altura[e4[i]]) printf("R");
      else printf("L");
    }
    else{
      printf("B");
    }
  }
  printf("\n");
  return 0;
}

Compilation message

oneway.cpp: In function 'int main()':
oneway.cpp:79:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d",&N,&M);
   ~~~~~^~~~~~~~~~~~~~~
oneway.cpp:81:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&e1[i],&e2[i]);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~
oneway.cpp:85:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&K);
   ~~~~~^~~~~~~~~
oneway.cpp:88:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&u,&v);
     ~~~~~^~~~~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 9720 KB Output is correct
2 Correct 9 ms 9828 KB Output is correct
3 Correct 10 ms 9992 KB Output is correct
4 Correct 10 ms 9992 KB Output is correct
5 Correct 10 ms 10084 KB Output is correct
6 Correct 13 ms 10084 KB Output is correct
7 Correct 13 ms 10120 KB Output is correct
8 Correct 11 ms 10120 KB Output is correct
9 Correct 10 ms 10120 KB Output is correct
10 Correct 9 ms 10120 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 9720 KB Output is correct
2 Correct 9 ms 9828 KB Output is correct
3 Correct 10 ms 9992 KB Output is correct
4 Correct 10 ms 9992 KB Output is correct
5 Correct 10 ms 10084 KB Output is correct
6 Correct 13 ms 10084 KB Output is correct
7 Correct 13 ms 10120 KB Output is correct
8 Correct 11 ms 10120 KB Output is correct
9 Correct 10 ms 10120 KB Output is correct
10 Correct 9 ms 10120 KB Output is correct
11 Correct 86 ms 13872 KB Output is correct
12 Correct 91 ms 15984 KB Output is correct
13 Correct 129 ms 17344 KB Output is correct
14 Correct 165 ms 19408 KB Output is correct
15 Correct 163 ms 20168 KB Output is correct
16 Correct 201 ms 21424 KB Output is correct
17 Correct 167 ms 23660 KB Output is correct
18 Correct 196 ms 23660 KB Output is correct
19 Correct 173 ms 24472 KB Output is correct
20 Correct 125 ms 24472 KB Output is correct
21 Correct 94 ms 24472 KB Output is correct

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 9720 KB Output is correct
2 Correct 9 ms 9828 KB Output is correct
3 Correct 10 ms 9992 KB Output is correct
4 Correct 10 ms 9992 KB Output is correct
5 Correct 10 ms 10084 KB Output is correct
6 Correct 13 ms 10084 KB Output is correct
7 Correct 13 ms 10120 KB Output is correct
8 Correct 11 ms 10120 KB Output is correct
9 Correct 10 ms 10120 KB Output is correct
10 Correct 9 ms 10120 KB Output is correct
11 Correct 86 ms 13872 KB Output is correct
12 Correct 91 ms 15984 KB Output is correct
13 Correct 129 ms 17344 KB Output is correct
14 Correct 165 ms 19408 KB Output is correct
15 Correct 163 ms 20168 KB Output is correct
16 Correct 201 ms 21424 KB Output is correct
17 Correct 167 ms 23660 KB Output is correct
18 Correct 196 ms 23660 KB Output is correct
19 Correct 173 ms 24472 KB Output is correct
20 Correct 125 ms 24472 KB Output is correct
21 Correct 94 ms 24472 KB Output is correct
22 Execution timed out 3011 ms 24472 KB Time limit exceeded
23 Halted 0 ms 0 KB -