Submission #1028402

#	Time	Username	Problem	Language	Result	Execution time	Memory
1028402		vjudge1	Chase (CEOI17_chase)	C++17	70 / 100	113 ms	93136 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,dp[N][101],ady[N];
void dfsans(ll u,ll pa=0){
    if(pa==0)dp[u][1]=ady[u];
    else{
        fore(c,1,V+1){
            dp[u][c]=max(dp[pa][c],dp[pa][c-1]+ady[u]-p[pa]);
        }
    }
    fore(c,1,V+1)ans=max(ans,dp[u][c]);
    for(ll v:graph[u]){
        if(v==pa)continue;
        dfsans(v,u);
    }
}
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];
    // dfs(1);
    for(ll a=1;a<=n;a++){
        if(n>1000&&a>1)break;
        act=-p[a];
        fore(i,1,n+1)pact[i]=p[i];
        fore(i,1,n+1)
            fo(j,101)
                dp[i][j]=0;
        dfsans(a);
    }
    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: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 30 / 30
• Subtask 4: 0 / 30