Submission #416070

#	Time	Username	Problem	Language	Result	Execution time	Memory
416070		Pichon5	Paths (BOI18_paths)	C++17	20 / 100	364 ms	14140 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;
ll G[tam][3];
ll C[tam];
int  main(){
   ll n,m,k,x,a,b;
   cin>>n>>m>>k;
   for(int i=1;i<=n;i++){
      cin>>x;
      C[i]=x-1;
   }
   ll res=0;   
   for(int i=0;i<m;i++){
      cin>>a>>b;
      if(C[a]!=C[b])res+=2;
      G[a][C[b]]++;
      G[b][C[a]]++;
   }
   for(int i=1;i<=n;i++){
      if(C[i]==0)res+=2*G[i][1]*G[i][2];
      if(C[i]==1)res+=2*G[i][0]*G[i][2];
      if(C[i]==2)res+=2*G[i][0]*G[i][1];
   }
   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: 0 / 23
• Subtask 2: 20 / 20
• Subtask 3: 0 / 27
• Subtask 4: 0 / 30