Submission #416075

#	Time	Username	Problem	Language	Result	Execution time	Memory
416075		Pichon5	Paths (BOI18_paths)	C++17	70 / 100	666 ms	95916 KiB

paths

#include<bits/stdc++.h>
#define ll long long int
#define pb push_back
#define vi vector<int>
#define vll vector<ll>
#define ff first
#define ss second
#define fast ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
//"\n" __builtin_popcount
using namespace std;
#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
const int tam=300005;
vll G[tam];
ll C[tam];
ll res=0;
ll dp[tam][32];
ll dfs(int nodo, int mask){
   if(__builtin_popcount(mask)==4)return 0;
   if(dp[nodo][mask]!=-1)return dp[nodo][mask];
   dp[nodo][mask]=0;
   for(auto it : G[nodo]){
      if(mask&(1<<C[it]))continue;
      dp[nodo][mask]+=1+dfs(it,mask|(1<<C[it]));
   }
   return dp[nodo][mask];
}
int  main(){
   fast
   ll n,m,k,x,a,b;
   memset(dp,-1,sizeof(dp));
   cin>>n>>m>>k;
   for(int i=1;i<=n;i++){
      cin>>x;
      C[i]=x-1;
   }   
   for(int i=0;i<m;i++){
      cin>>a>>b;
      G[a].pb(b);
      G[b].pb(a);
   }
   for(int i=1;i<=n;i++){
      res+=dfs(i,(1<<C[i]));
   }
   cout<<res<<endl;
   
   return 0;
}

Compilation message (stderr)

paths.cpp:12: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
   12 | #pragma GCC optimization ("O3")
      | 
paths.cpp:13: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
   13 | #pragma GCC optimization ("unroll-loops")
      |

• Subtask 1: 23 / 23
• Subtask 2: 20 / 20
• Subtask 3: 27 / 27
• Subtask 4: 0 / 30