Submission #1029539

#	Time	Username	Problem	Language	Result	Execution time	Memory
1029539		sopaconk	Chase (CEOI17_chase)	C++17	30 / 100	247 ms	335724 KiB

chase

#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
#pragma GCC target("popcnt")
#define endl '\n'
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define fo(i,n) for(auto i =0 ; i < n;i++)
#define fore(i,l,r) for(auto i = l; i < r;i++)
#define forex(i,r,l) for(auto i = r; i >= l; i--)
#define ffo(i,n) forex(i,n-1,0)
#define all(x) x.begin(),x.end()
#define lsb(x) x&(-x)
#define sz(x) (int)x.size()
#define gcd(a,b) __gcd(a,b)
#define vii vector<ii>
#define pq_min(a) priority_queue<a, vector<a>, greater<a>>
#define fls cout.flush()
using namespace std;
using ll = long long;
using ull = unsigned long long;
using vi = vector<ll>;
using ii = pair<ll,ll>;
using mii = map<ll,ll>;
using lld = long double;
void valid(ll in){cout<<((in)?"YES\n":"NO\n");}
const int N = 1e5 + 7,LOG=19;
vi graph[N];
ll n,V,p[N],pact[N],ans,act,ady[N];
ll dp[N][101][2],dp2[N][101][2];
void dfsans(ll u,ll pa=0){
    dp[u][1][1]=ady[u];
    dp2[u][1][1]=ady[u];
    // dp[u][i] ir de cualquier nodo en subarbol de u -> u, soltando i migajas
    // dp2[u][i] ir de u -> cualquier nodo en subarbol de u, soltando i migajas
    for(ll v:graph[u]){
        if(v==pa)continue;
        dfsans(v,u);
        fore(i,0,V+1)
            ans = max({ans, dp[u][i][1]+dp2[v][V-i][1]-p[u],dp[u][i][1]+dp2[v][V-i][0],dp[u][i][0]+dp2[v][V-i][1]-p[u],dp[u][i][0]+dp2[v][V-i][0]});
       
        fore(i,1,V+1){
            // en dp1 mi padre es v
            dp[u][i][1] = max({dp[u][i][1], dp[v][i-1][1]+ady[u]-p[v], dp[v][i-1][0]+ady[u]-p[v]});
            dp[u][i][0] = max({dp[u][i][0], dp[v][i][1], dp[v][i][0]});
            // en dp2 u es el padre de v
            dp2[u][i][1] = max({dp2[u][i][1], dp2[v][i-1][1]+ady[u]-p[u], dp2[v][i-1][0]+ady[u]});
            dp2[u][i][0] = max({dp2[u][i][0], dp2[v][i][1]-p[u], dp2[v][i][0]});
        }
    }
}
void test_case(){
    cin >> n >> V;
    fo(i,n)cin>>p[i+1];
    fo(i,n-1){
        ll a,b;
        cin>>a>>b;
        graph[a].pb(b);
        graph[b].pb(a);
    }
    fore(i,1,n+1)
        for(int v:graph[i])
            ady[i]+=p[v];
    dfsans(1);
    cout<<ans<<endl;
}
int main(){cin.tie(0)->sync_with_stdio(0);
    int t=1;
    // cin >> t;
    while(t--)test_case();
}

Compilation message (stderr)

chase.cpp:4: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    4 | #pragma GCC optimization ("O3")
      | 
chase.cpp:5: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    5 | #pragma GCC optimization ("unroll-loops")
      |

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