Submission #308416

#	Time	Username	Problem	Language	Result	Execution time	Memory
308416		ant101	Dostavljač (COCI18_dostavljac)	C++14	56 / 140	2086 ms	4896 KiB

dostavljac

#include <iostream>
#include <algorithm>
#include <cstring>
#include <iomanip>
#include <fstream>
#include <cmath>
#include <vector>
#include <set>
#include <unordered_set>
#include <unordered_map>
#include <map>
#include <stack>
#include <queue>
#include <assert.h>
#include <limits>
#include <cstdio>
#include <complex>
using namespace std;

typedef long long ll;
typedef long double ld;
typedef double db;
typedef string str;

typedef pair<int, int> pi;
typedef pair<ll,ll> pl;
typedef pair<ld,ld> pd;
#define mp make_pair
#define f first
#define s second

typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<ld> vd;
typedef vector<str> vs;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
typedef vector<pd> vpd;

#define sz(x) (int)x.size()
#define all(x) begin(x), end(x)
#define rall(x) (x).rbegin(), (x).rend()
#define rsz resize
#define ins insert
#define ft front()
#define bk back()
#define pf push_front
#define pb push_back
#define eb emplace_back
#define lb lower_bound
#define ub upper_bound

#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)

const int MOD = 1e9+7; // 998244353; // = (119<<23)+1
const int MX = 5e2+5;
const ll INF = 1e18;
const ld PI = 4*atan((ld)1);
const int dx[4] = {0,1,0,-1}, dy[4] = {1,0,-1,0};


namespace io {
    void setIn(string s) { freopen(s.c_str(),"r",stdin); }
    void setOut(string s) { freopen(s.c_str(),"w",stdout); }
    void setIO(string s = "") {
        ios_base::sync_with_stdio(0); cin.tie(0); // fast I/O
        // cin.exceptions(cin.failbit); // ex. throws exception when you try to read letter into int
        if (sz(s)) {
            setIn(s+".in");
            setOut(s+".out");
        } // for USACO
    }
}

using namespace io;

namespace input {
    template<class T> void re(complex<T>& x);
    template<class T1, class T2> void re(pair<T1,T2>& p);
    template<class T> void re(vector<T>& a);
    template<class T, size_t SZ> void re(array<T,SZ>& a);
    
    template<class T> void re(T& x) { cin >> x; }
    void re(double& x) { string t; re(t); x = stod(t); }
    void re(ld& x) { string t; re(t); x = stold(t); }
    template<class Arg, class... Args> void re(Arg& first, Args&... rest) {
        re(first); re(rest...);
    }
    
    template<class T> void re(complex<T>& x) { T a,b; re(a,b); x = cd(a,b); }
    template<class T1, class T2> void re(pair<T1,T2>& p) { re(p.f,p.s); }
    template<class T> void re(vector<T>& a) { F0R(i,sz(a)) re(a[i]); }
    template<class T, size_t SZ> void re(array<T,SZ>& a) { F0R(i,SZ) re(a[i]); }
}

namespace output {
    template<class T1, class T2> void pr(const pair<T1,T2>& x);
    template<class T, size_t SZ> void pr(const array<T,SZ>& x);
    template<class T> void pr(const vector<T>& x);
    template<class T> void pr(const set<T>& x);
    template<class T1, class T2> void pr(const map<T1,T2>& x);
    
    template<class T> void pr(const T& x) { cout << x; }
    template<class Arg, class... Args> void pr(const Arg& first, const Args&... rest) {
        pr(first); pr(rest...);
    }
    
    template<class T1, class T2> void pr(const pair<T1,T2>& x) {
        pr("{",x.f,", ",x.s,"}");
    }
    template<class T> void prContain(const T& x) {
        pr("{");
        bool fst = 1; for (const auto& a: x) pr(!fst?", ":"",a), fst = 0; // const needed for vector<bool>
        pr("}");
    }
    template<class T, size_t SZ> void pr(const array<T,SZ>& x) { prContain(x); }
    template<class T> void pr(const vector<T>& x) { prContain(x); }
    template<class T> void pr(const set<T>& x) { prContain(x); }
    template<class T1, class T2> void pr(const map<T1,T2>& x) { prContain(x); }
    
    void ps() { pr("\n"); }
    template<class Arg> void ps(const Arg& first) {
        pr(first); ps(); // no space at end of line
    }
    template<class Arg, class... Args> void ps(const Arg& first, const Args&... rest) {
        pr(first," "); ps(rest...); // print w/ spaces
    }
}

using namespace output;

using namespace input;

ll add(ll a, ll b) {
    a += b;
    if(a >= MOD) {
        a -= MOD;
    }
    return a;
}
ll sub(ll a, ll b) {
    a -= b;
    if(a < 0) {
        a += MOD;
    }
    return a;
}

ll mul(ll a, ll b) {
    return (a * b)%MOD;
}

void add_self(ll& a, ll b) {
    a = add(a, b);
}
void sub_self(ll& a, ll b) {
    a = sub(a, b);
}
void mul_self(ll& a, ll b) {
    a = mul(a, b);
}

ll N, M;
vl adj[MX];
ll A[MX];
ll dp[MX][MX][2];



void delete_edges(ll u, ll p) {
    for (ll i = 0; i<sz(adj[u]); i++) {
        if (adj[u][i] == p) {
            adj[u].erase(adj[u].begin()+i);
            break;
        }
    }
    trav(v, adj[u]) {
        delete_edges(v, u);
    }
}

ll f(ll u, ll t, ll ends) {
    if (!sz(adj[u])) {
        return 0;
    }
    if (dp[u][t][ends] != -1) {
        return dp[u][t][ends];
    }
    vector<vector<ll>> info(sz(adj[u])+1, vector<ll>(t+1, 0));
    vector<vector<ll>> info2(sz(adj[u])+1, vector<ll>(t+1, 0));
    F0R (i, sz(adj[u])) {
        F0R (j, t) {
            info[i][j] = f(adj[u][i], j, 0);
            info2[i][j] = f(adj[u][i], j, 1);
        }
    }
    vector<vector<vector<ll>>> dp2(sz(adj[u])+1, vector<vector<ll>>(t+1, vector<ll>(2, 0)));
    F0R (i, sz(adj[u])) {
        FOR (j, 0, t+1) {
            dp2[i+1][j][0] = max(dp2[i+1][j][0], dp2[i][j][0]);
            dp2[i+1][j][1] = max(dp2[i+1][j][1], dp2[i][j][1]);
            FOR (j2, 0, t+1) {
                if (j-j2-3 >= 0) {
                    dp2[i+1][j-j2-3][0] = max(dp2[i+1][j-j2-3][0], dp2[i][j][0]+info[i][j2]+A[adj[u][i]]);
                    dp2[i+1][j-j2-3][1] = max(dp2[i+1][j-j2-3][1], dp2[i][j][1]+info[i][j2]+A[adj[u][i]]);
                }
                if (j-j2-2 >= 0) {
                    dp2[i+1][j-j2-2][1] = max(dp2[i+1][j-j2-2][1], dp2[i][j][0]+info2[i][j2]+A[adj[u][i]]);
                    dp2[i+1][j-j2-2][0] = max(dp2[i+1][j-j2-2][0], dp2[i][j][0]+info[i][j2]);
                    dp2[i+1][j-j2-2][1] = max(dp2[i+1][j-j2-2][1], dp2[i][j][1]+info[i][j2]);
                }
                if (j-j2-1 >= 0) {
                    dp2[i+1][j-j2-1][1] = max(dp2[i+1][j-j2-1][1], dp2[i][j][0]+info2[i][j2]);
                }
            }
        }
    }
    dp[u][t][ends] = 0;
    FOR (j, 0, t+1) {
        dp[u][t][ends] = max(dp[u][t][ends], dp2[sz(adj[u])][j][ends]);
    }
    return dp[u][t][ends];
}

int main() {
    setIO();
    memset(dp, -1, sizeof(dp));
    re(N, M);
    FOR (i, 1, N+1) {
        re(A[i]);
    }
    F0R (i, N-1) {
        ll a, b;
        re(a, b);
        adj[a].pb(b);
        adj[b].pb(a);
    }
    delete_edges(1, 0);
    ps(max(f(1, M, 1), A[1]+f(1, M-1, 1)));
    return 0;
}

Compilation message (stderr)

dostavljac.cpp: In function 'void io::setIn(std::string)':
dostavljac.cpp:67:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   67 |     void setIn(string s) { freopen(s.c_str(),"r",stdin); }
      |                            ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
dostavljac.cpp: In function 'void io::setOut(std::string)':
dostavljac.cpp:68:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   68 |     void setOut(string s) { freopen(s.c_str(),"w",stdout); }
      |                             ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

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