Submission #173519

#	Time	Username	Problem	Language	Result	Execution time	Memory
173519		rzbt	Paths (BOI18_paths)	C++14	100 / 100	549 ms	107512 KiB

paths

#include <bits/stdc++.h>
#define mp make_pair
#define pb push_back
#define F first
#define S second
#define all(x) x.begin(),x.end()
#define MAXN 300005
typedef long long ll;


using namespace std;

vector<ll> niz[MAXN];
ll dp[MAXN][35];
ll koji[MAXN];
ll n,m,k;
ll res=0;
int main()
{
    scanf("%lld %lld %lld", &n, &m, &k);
    for(ll i=1;i<=n;i++){
        ll t;
        scanf("%lld", &t);
        t--;
        dp[i][1<<t]=1;
        koji[i]=1<<t;
    }
    for(ll i=1;i<=m;i++){
        ll t1,t2;
        scanf("%lld %lld", &t1, &t2);
        niz[t1].pb(t2);
        niz[t2].pb(t1);
    }
    for(ll j=1;j<(1<<k);j++){
        for(ll i=1;i<=n;i++){
            if(!(koji[i]&j))continue;
            for(auto x:niz[i]){
                dp[i][j]+=dp[x][j-koji[i]];

            }
            res+=dp[i][j];
            //printf("  %lld %lld   %lld\n",i,j,dp[i][j]);
        }
    }
    printf("%lld",res-n);
    return 0;
}

Compilation message (stderr)

paths.cpp: In function 'int main()':
paths.cpp:20:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld %lld %lld", &n, &m, &k);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
paths.cpp:23:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld", &t);
         ~~~~~^~~~~~~~~~~~
paths.cpp:30:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld %lld", &t1, &t2);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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