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답안 #268178

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
268178 2020-08-16T10:06:15 Z MarcoMeijer Chase (CEOI17_chase) C++14
40 / 100
 4000 ms 29348 KB 
#include <bits/stdc++.h>
using namespace std;
 
// macros
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;
typedef pair<ll, ll> lll;
typedef tuple<int, int, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<iii> viii;
typedef vector<ll> vll;
typedef vector<lll> vlll;
#define REP(a,b,c) for(int a=int(b); a<int(c); a++)
#define RE(a,c) REP(a,0,c)
#define RE1(a,c) REP(a,1,c+1)
#define REI(a,b,c) REP(a,b,c+1)
#define REV(a,b,c) for(int a=int(c-1); a>=int(b); a--)
#define FOR(a,b) for(auto& a : b)
#define all(a) a.begin(), a.end()
#define INF 1e9
#define EPS 1e-9
#define pb push_back
#define popb pop_back
#define fi first
#define se second
#define sz size()
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
 
// input
template<class T> void IN(T& x) {cin >> x;}
template<class H, class... T> void IN(H& h, T&... t) {IN(h); IN(t...); }
 
// output
template<class T1, class T2> void OUT(const pair<T1,T2>& x);
template<class T> void OUT(const T& x) {cout << x;}
template<class H, class... T> void OUT(const H& h, const T&... t) {OUT(h); OUT(t...); }
template<class T1, class T2> void OUT(const pair<T1,T2>& x) {OUT(x.fi,' ',x.se);}
template<class... T> void OUTL(const T&... t) {OUT(t..., "\n"); }
template<class H> void OUTLS(const H& h) {OUTL(h); }
template<class H, class... T> void OUTLS(const H& h, const T&... t) {OUT(h,' '); OUTLS(t...); }
 
//===================//
//  Added libraries  //
//===================//
 
//===================//
//end added libraries//
//===================//
 
void program();
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    program();
}
 
 
//===================//
//   begin program   //
//===================//
 
const int MX = 3e5+1e4;
 
int n, m, mxbc;
ll p[MX];
vii adj[MX];
int a[MX], b[MX];
ll dp[MX][2];
int skip[MX][2];
int skipe[MX][2];
lll best[MX][2];
int bestU[MX][2];
ll SM[MX];
 
lll push(lll p, ll v) {
    return {max(p.fi,v), max(p.se,min(p.fi,v))};
}
ll getAns(int e, int bc);
void fillBest(int e, int bc) {
    int u = b[e];
    if(best[u][bc].fi != -1 && skip[u][bc] == -1) return;
    if(best[u][bc].fi != -1 && skip[u][bc] == a[e]) return;
 
    if(best[u][bc].fi != -1) {
        ll res = getAns(skipe[u][bc], bc);
        best[u][bc] = push(best[u][bc], res);
        if(best[u][bc].fi == res) bestU[u][bc] = skip[u][bc];
        skip[u][bc] = -1;
    } else {
        FOR(v,adj[u]) if(v.fi != a[e]) {
            ll res = getAns(v.se, bc);
            best[u][bc] = push(best[u][bc], res);
            if(best[u][bc].fi == res) bestU[u][bc] = v.fi;
        } else {
            skipe[u][bc] = v.se;
        }
        skip[u][bc] = a[e];
    }
}
ll getAns(int e, int bc) {
    if(dp[e][bc] != -1) return dp[e][bc];
    int u=a[e], v=b[e];
 
    ll sm = SM[v] - ll(u == -1 ? 0 : p[u]);
    ll ans=sm;
    fillBest(e, bc);
    ans = max(ans,    (bestU[v][ bc] == u ? best[v][ bc].se : best[v][ bc].fi));
    ans = max(ans, sm+(bestU[v][!bc] == u ? best[v][!bc].se : best[v][!bc].fi));
 
    return dp[e][bc]=ans;
}
 
void program() {
    IN(n,mxbc);
    RE(i,n) IN(p[i]);
    RE(i,n-1) {
        IN(a[i], b[i]); a[i]--; b[i]--;
        adj[a[i]].pb({b[i],i});
        adj[b[i]].pb({a[i],i+n-1});
    }
    RE(i,n-1) a[i+n-1] = b[i];
    RE(i,n-1) b[i+n-1] = a[i];
    m = (n-1)*2;
    RE(u,n) {
        SM[u] = 0;
        FOR(v,adj[u]) SM[u] += p[v.fi];
    }
 
    RE(j,m) dp[j][0] = 0;
    RE1(i,mxbc) {
        RE(j,m) dp[j][i%2] = -1;
        RE(j,n) best[j][i%2] = {-1, 0};
        RE(j,m) getAns(j,i%2);
    }
    
    ll ans = 0;
    RE(u,n-1) {
        FOR(v,adj[u]) {
            ans = max(ans, dp[v.se][mxbc%2]);
            ans = max(ans, SM[u]+dp[v.se][(mxbc+1)%2]);
        }
    }
    if(mxbc == 0) ans = 0;
    OUTL(ans);
}

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 7680 KB Output is correct
2 Correct 5 ms 7680 KB Output is correct
3 Correct 6 ms 7680 KB Output is correct
4 Correct 6 ms 7680 KB Output is correct
5 Correct 6 ms 7680 KB Output is correct
6 Correct 5 ms 7680 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 7680 KB Output is correct
2 Correct 5 ms 7680 KB Output is correct
3 Correct 6 ms 7680 KB Output is correct
4 Correct 6 ms 7680 KB Output is correct
5 Correct 6 ms 7680 KB Output is correct
6 Correct 5 ms 7680 KB Output is correct
7 Correct 11 ms 7936 KB Output is correct
8 Correct 7 ms 7936 KB Output is correct
9 Correct 6 ms 7808 KB Output is correct
10 Correct 12 ms 7808 KB Output is correct
11 Correct 9 ms 7808 KB Output is correct
12 Correct 7 ms 7808 KB Output is correct

Subtask #3
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1937 ms 26488 KB Output is correct
2 Correct 2072 ms 29348 KB Output is correct
3 Correct 503 ms 22508 KB Output is correct
4 Correct 104 ms 23232 KB Output is correct
5 Execution timed out 4024 ms 23180 KB Time limit exceeded
6 Halted 0 ms 0 KB -

Subtask #4
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 7680 KB Output is correct
2 Correct 5 ms 7680 KB Output is correct
3 Correct 6 ms 7680 KB Output is correct
4 Correct 6 ms 7680 KB Output is correct
5 Correct 6 ms 7680 KB Output is correct
6 Correct 5 ms 7680 KB Output is correct
7 Correct 11 ms 7936 KB Output is correct
8 Correct 7 ms 7936 KB Output is correct
9 Correct 6 ms 7808 KB Output is correct
10 Correct 12 ms 7808 KB Output is correct
11 Correct 9 ms 7808 KB Output is correct
12 Correct 7 ms 7808 KB Output is correct
13 Correct 1937 ms 26488 KB Output is correct
14 Correct 2072 ms 29348 KB Output is correct
15 Correct 503 ms 22508 KB Output is correct
16 Correct 104 ms 23232 KB Output is correct
17 Execution timed out 4024 ms 23180 KB Time limit exceeded
18 Halted 0 ms 0 KB -