Submission #1167588

#	Time	Username	Problem	Language	Result	Execution time	Memory
1167588		sasde	Paths (BOI18_paths)	C++20	23 / 100	199 ms	91972 KiB

paths

#include<bits/stdc++.h>
#define task "strdel"
#define ii pair<int,int>
#define iii pair<int,ii>
#define iv pair<ii,ii>
#define se second
#define fi first
#define ffi fi.fi
#define sfi se.fi
#define sse se.se
#define fse fi.se
#define lt(i, c, d) for(int i = c; i <= d; ++i)
#define fl(i, c, d) for(int i = d; i >= c; --i)
#define pb push_back
#define emb emplace_back
#define emf emplace_front
#define em emplace
using namespace std;
const int N=3e5+5,lg=20,mod=1e9+7;
mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
int Rand(int u,int v){
 return u+rd()%(v-u+1);
}
long long dp[N][(1<<5)];
int p[N],m,n,k;
vector<int>a[N];
void solve(){
    cin >> n >> m >> k;
    for(int i=1;i<=n;++i){
        cin >> p[i];
        --p[i];
        dp[i][(1<<p[i])]=1;
    }
    for(int i=1;i<=m;++i){
        int u,v;
        cin >> u >> v;
        a[u].emb(v);
        a[v].emb(u);
    }
    int ans=0;
    for(int mask=0;mask<(1<<k);++mask){
        for(int u=1;u<=n;++u){
            for(int v:a[u]){
                if(mask&(1<<p[v]))
                    dp[v][mask]+=dp[u][mask^(1<<p[v])];
            }
        }
    }
    for(int mask=0;mask<(1<<k);++mask)for(int i=1;i<=n;++i)ans+=dp[i][mask];
        cout << ans-n;
}
main()
{
  srand(time(0));
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    if(fopen(task".inp","r")){
      freopen(task".inp","r",stdin);
      freopen(task".out","w",stdout);
    }
    int t=1;
 //   cin >> t;
while(t--){
    solve();
    cout<<'\n';
}

}

Compilation message (stderr)

paths.cpp:52:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   52 | main()
      | ^~~~
paths.cpp: In function 'int main()':
paths.cpp:59:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |       freopen(task".inp","r",stdin);
      |       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
paths.cpp:60:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |       freopen(task".out","w",stdout);
      |       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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