Submission #534774

#	Time	Username	Problem	Language	Result	Execution time	Memory
534774		farhan132	Power Plant (JOI20_power)	C++17	0 / 100	8 ms	12060 KiB

power

/***Farhan132***/
//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,fma")
//#pragma GCC optimization ("unroll-loops")
#include <bits/stdc++.h>



using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
typedef double dd;
typedef vector<ll> vll;
typedef pair<ll , ll> ii;
typedef vector< ii > vii;
typedef pair < pair < ll , ll > , pair < ll , ll > > cm; 
 
#define ff first
#define ss second
#define pb push_back
#define in insert
#define f0(b) for(int i=0;i<(b);i++)
#define f00(b) for(int j=0;j<(b);j++)
#define f1(b) for(int i=1;i<=(b);i++)
#define f11(b) for(int j=1;j<=(b);j++)
#define f2(a,b) for(int i=(a);i<=(b);i++)
#define f22(a,b) for(int j=(a);j<=(b);j++)
#define sf(a) scanf("%lld",&a)
#define sff(a,b) scanf("%lld %lld", &a , &b)
#define pf(a) printf("%lld\n",a)
#define pff(a,b) printf("%lld %lld\n", a , b)
#define PI 3.14159265359
#define bug printf("**!\n")
#define mem(a , b) memset(a, b ,sizeof(a))
#define front_zero(n) __builtin_clzll(n)
#define back_zero(n) __builtin_ctz(n)
#define total_one(n) __builtin_popcount(n)
#define clean fflush(stdout)

const ll mod =  (ll) 998244353;
const ll maxn = (ll)2e5 + 5;
const int nnn = 1048590;
const int inf = numeric_limits<int>::max()-1;
//const ll INF = numeric_limits<ll>::max()-1;
//const ll INF = (ll)1e18;
 
ll dx[]={0,1,0,-1};
ll dy[]={1,0,-1,0};
ll dxx[]={0,1,0,-1,1,1,-1,-1};
ll dyy[]={1,0,-1,0,1,-1,1,-1};

bool USACO = 0;

mt19937 rng(chrono::system_clock::now().time_since_epoch().count());

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
  
#define ordered_set tree<ll, null_type,less< ll >, rb_tree_tag,tree_order_statistics_node_update>

const ll N = 5e5 + 5;

string s;
vector < ll > v[N];

ll res = 1;

ll dp(ll node, ll p){
  ll ans = 0, mx = 0;
  for(auto u : v[node]){
    if(u - p){
      ll k = dp(u, node);
      ans += k;
      mx = max(mx, k);
    }
  }
  ll k = (s[node] == '1');
  res = max({res , mx + k , ans});
  ans = max(k , ans - k);
  return ans; 
}

void solve(){

    ll n; cin >> n;

    for(ll i = 1; i < n; i++){
      ll x , y; cin >> x >> y;
      v[x].pb(y);
      v[y].pb(x);
    }

    cin >> s;
    s = '1' + s;

    for(ll i = 1; i <= n; i++){
      if(v[i].size() <= 1){
        dp(i, 0);
        break;
      }
    }

    cout << res << '\n';

   return;
}

 
int main() {
    
    
    #ifdef LOCAL
        freopen("in", "r", stdin);
        freopen("out", "w", stdout);
    #else 
       ios_base::sync_with_stdio(0); cin.tie(NULL); cout.tie(NULL);
      
    #endif
    //pre(N);
    
    ll T = 1;
    //cin >> T;
    ll CT = 0;
    while(T--){
      //  cout << "Case #" << ++CT <<": " ;
        solve();
    }
 
    return 0;
}

Compilation message (stderr)

power.cpp: In function 'int main()':
power.cpp:125:8: warning: unused variable 'CT' [-Wunused-variable]
  125 |     ll CT = 0;
      |        ^~

• Subtask 1: 0 / 6
• Subtask 2: 0 / 41
• Subtask 3: 0 / 53