oj.uz

Submission #537781

# Submission time Handle Problem Language Result Execution time Memory
537781 2022-03-15T13:44:49 Z Lobo Beads and wires (APIO14_beads) C++17
57 / 100
 1000 ms 131072 KB 
#include<bits/stdc++.h>
using namespace std;
 
const int inf = (int) 1e9 + 10;
const int inf1 = (int) 1e9 + 10;
// #define int long long
#define dbl long double
#define endl '\n'
#define sc second
#define fr first
#define mp make_pair
#define pb push_back
#define all(x) x.begin(), x.end()
 
#define maxn 200020
 
int n;
vector<int> dp[maxn][4][2];
vector<pair<int,int>> g[maxn];

/*
u = vertice
p = como esta
    0 = liga pro pai ou pra algum filho com azul e o outro azul que vai ligar para esse segundo
    3 = liga pro pai ou pra algum filho com azul e esse cara que vai ligar para o primeiro

    1 = liga pro pai com red ou nao pode mais ligar pra ninguem / ja fez sua ligacao
    2 = pode ligar para alguem com red ou para 2 com azul / ainda nao ligou pra ninguem

    
f = pode nao usar nada
    1 = tem que nao usar
    0 = tem que usar
*/
int sol(int u, int p, int f, int id, int ant) {
    if(dp[u][p][f][id] != -1) return dp[u][p][f][id];
    dp[u][p][f][id] = 0;

    if(p == 0) {
        //tem que ligar para alguem com azul e nao se preocupa

        //se ja tiver passado por todo mundo é -inf
        if(id == g[u].size()) return dp[u][p][f][id] = -inf;
        int v = g[u][id].fr;
        int w = g[u][id].sc;
        if(v == ant) return dp[u][p][f][id] = sol(u,p,f,id+1,ant);

        int ans = -inf;

        //se o outro azul é v
        ans = max(ans, w + sol(v,2,0,0,u) + sol(u,1,f,id+1,ant));
        ans = max(ans, w + sol(v,2,f,0,u) + sol(u,1,0,id+1,ant));

        //só passa para o próximo podendo ligar para ele com azul 
        //(e o outro azul que vai estar ocupado) ou red
        ans = max(ans, max(sol(v,1,0,0,u),w+sol(v,3,0,0,u)) + sol(u,0,f,id+1,ant));
        ans = max(ans, max(sol(v,1,f,0,u),w+sol(v,3,f,0,u)) + sol(u,0,0,id+1,ant));

        // cout << u << " ja ligou azul p = 0 || f = " << f << " atual no " << v << " id " << id << " = " << " = " << ans << endl;
        return dp[u][p][f][id] = ans;
    }
    else if(p == 3) {
         //tem que ligar para alguem com azul e o filho azul nao pode ligar para mais ninguem

        //se ja tiver passado por todo mundo é -inf
        if(id == g[u].size()) return dp[u][p][f][id] = -inf;
        int v = g[u][id].fr;
        int w = g[u][id].sc;
        if(v == ant) return dp[u][p][f][id] = sol(u,p,f,id+1,ant);

        int ans = -inf;

        //se o outro azul é v
        ans = max(ans, w + sol(v,1,0,0,u) + sol(u,1,f,id+1,ant));
        ans = max(ans, w + sol(v,1,f,0,u) + sol(u,1,0,id+1,ant));

        //só passa para o próximo podendo ligar para ele com azul 
        //(e o outro azul que vai estar ocupado) ou red
        ans = max(ans, max(sol(v,1,0,0,u),w+sol(v,3,0,0,u)) + sol(u,3,f,id+1,ant));
        ans = max(ans, max(sol(v,1,f,0,u),w+sol(v,3,f,0,u)) + sol(u,3,0,id+1,ant));

        // cout << u << " ja ligou azul p = 3 || f = " << f << " atual no " << v << " id " << id << " = " << " = " << ans << endl;
        return dp[u][p][f][id] = ans;
    }
    else if(p == 1) {
        //ele ja fez a ligacao entao só pode passar pro próximo
        //o v pode ligar para ele com red ou azul

        if(id == g[u].size()) {
            if(f == 1) return dp[u][p][f][id] = -inf;
            else return dp[u][p][f][id] = 0;
        }
        int v = g[u][id].fr;
        int w = g[u][id].sc;
        if(v == ant) return dp[u][p][f][id] = sol(u,p,f,id+1,ant);

        int ans = -inf;

        //só passa para o próximo podendo ligar para ele com azul 
        //(e o outro azul que vai estar ocupado) ou red
        ans = max(ans, max(sol(v,1,0,0,u),w+sol(v,3,0,0,u)) + sol(u,1,f,id+1,ant));
        ans = max(ans, max(sol(v,1,f,0,u),w+sol(v,3,f,0,u)) + sol(u,1,0,id+1,ant));

        // cout << u << " ja ligou para todos || f = " << f << " atual no " << v << " = " << ans << endl;
        return dp[u][p][f][id] = ans;
    }
    else if(p == 2) {
        //ele nao ligou para ninguem ainda e se f = 1 pode continuear nao ligando

        if(id == g[u].size()) {
            if(f == 1) return dp[u][p][f][id] = 0; //ele fez a opcao de nao ligar para niguem
            else return dp[u][p][f][id] = -inf; //ele nao pode nao ligar para ninguem e mesmo assim fez
        }
        int v = g[u][id].fr;
        int w = g[u][id].sc;
        if(v == ant) return dp[u][p][f][id] = sol(u,p,f,id+1,ant);

        int ans = -inf;

        //só passa para o próximo podendo ligar para ele com azul 
        //(e o outro azul que vai estar ocupado) ou red
        ans = max(ans, max(sol(v,1,0,0,u),w+sol(v,3,0,0,u)) + sol(u,2,f,id+1,ant));
        ans = max(ans, max(sol(v,1,f,0,u),w+sol(v,3,f,0,u)) + sol(u,2,0,id+1,ant));

        //ele vai fazer o papel da aresta red que é quebrada pelo v
        ans = max(ans, w+sol(v,0,0,0,u) + sol(u,1,f,id+1,ant));
        ans = max(ans, w+sol(v,0,f,0,u) + sol(u,1,0,id+1,ant));

        //liga para o proximo com um uma aresta red
        ans = max(ans, sol(v,2,0,0,u) + sol(u,1,f,id+1,ant));
        ans = max(ans, sol(v,2,f,0,u) + sol(u,1,0,id+1,ant));

        //liga para o proximo com uma aresta azul e v que vai fazer a aresta red
        ans = max(ans, w+sol(v,1,0,0,u) + sol(u,0,f,id+1,ant));
        ans = max(ans, w+sol(v,1,f,0,u) + sol(u,0,0,id+1,ant));

        //liga para o proximo com uma aresta azul e o outro que vai fazer a aresta red
        ans = max(ans, w+sol(v,2,0,0,u) + sol(u,3,f,id+1,ant));
        ans = max(ans, w+sol(v,2,f,0,u) + sol(u,3,0,id+1,ant));

        // cout << u << " nao liga pra ninguem e || f = " << f << " atual no " << v << " = " << ans << endl;
        return dp[u][p][f][id] = ans;
    }
    return 0;
}
 
void solve() {
    cin >> n;
 
    for(int i = 1; i < n; i++) {
        int u,v,w;
        cin >> u >> v >> w;
        g[u].pb(mp(v,w));
        g[v].pb(mp(u,w));
    }
 
    int rt;
    for(int i = 1; i <= n; i++) {
        if(g[i].size() == 1) {
            rt = i;
            // break;
        }
    }

    for(int i = 1; i <= n; i++) {
        for(int j = 0; j <= g[i].size(); j++) {
            for(int k = 0; k <= 3; k++) {
                dp[i][k][0].pb(-1);
                dp[i][k][1].pb(-1);
            }
        }
    }
 
 
    cout << sol(rt,2,1,0,0) << endl;
}

int32_t main() {
    ios::sync_with_stdio(false); cin.tie(0);
 
    // freopen("in.in", "r", stdin);
    // freopen("out.out", "w", stdout);
 
    int tt = 1;
    // cin >> tt;
    while(tt--) solve();
 
}

Compilation message

beads.cpp: In function 'int sol(int, int, int, int, int)':
beads.cpp:43:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |         if(id == g[u].size()) return dp[u][p][f][id] = -inf;
      |            ~~~^~~~~~~~~~~~~~
beads.cpp:66:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   66 |         if(id == g[u].size()) return dp[u][p][f][id] = -inf;
      |            ~~~^~~~~~~~~~~~~~
beads.cpp:89:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   89 |         if(id == g[u].size()) {
      |            ~~~^~~~~~~~~~~~~~
beads.cpp:110:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  110 |         if(id == g[u].size()) {
      |            ~~~^~~~~~~~~~~~~~
beads.cpp: In function 'void solve()':
beads.cpp:166:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  166 |         for(int j = 0; j <= g[i].size(); j++) {
      |                        ~~^~~~~~~~~~~~~~
beads.cpp:8:14: warning: 'rt' may be used uninitialized in this function [-Wmaybe-uninitialized]
    8 | #define endl '\n'
      |              ^~~~
beads.cpp:157:9: note: 'rt' was declared here
  157 |     int rt;
      |         ^~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 42588 KB Output is correct
2 Correct 23 ms 42580 KB Output is correct
3 Correct 22 ms 42524 KB Output is correct
4 Correct 22 ms 42624 KB Output is correct
5 Correct 21 ms 42580 KB Output is correct
6 Correct 21 ms 42580 KB Output is correct
7 Correct 23 ms 42480 KB Output is correct
8 Correct 22 ms 42580 KB Output is correct
9 Correct 23 ms 42580 KB Output is correct
10 Correct 22 ms 42580 KB Output is correct
11 Correct 23 ms 42580 KB Output is correct
12 Correct 27 ms 42544 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 42588 KB Output is correct
2 Correct 23 ms 42580 KB Output is correct
3 Correct 22 ms 42524 KB Output is correct
4 Correct 22 ms 42624 KB Output is correct
5 Correct 21 ms 42580 KB Output is correct
6 Correct 21 ms 42580 KB Output is correct
7 Correct 23 ms 42480 KB Output is correct
8 Correct 22 ms 42580 KB Output is correct
9 Correct 23 ms 42580 KB Output is correct
10 Correct 22 ms 42580 KB Output is correct
11 Correct 23 ms 42580 KB Output is correct
12 Correct 27 ms 42544 KB Output is correct
13 Correct 23 ms 42580 KB Output is correct
14 Correct 21 ms 42580 KB Output is correct
15 Correct 21 ms 42580 KB Output is correct
16 Correct 22 ms 42548 KB Output is correct
17 Correct 22 ms 42580 KB Output is correct
18 Correct 23 ms 42580 KB Output is correct
19 Correct 22 ms 42572 KB Output is correct
20 Correct 26 ms 42656 KB Output is correct
21 Correct 22 ms 42632 KB Output is correct
22 Correct 23 ms 42580 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 42588 KB Output is correct
2 Correct 23 ms 42580 KB Output is correct
3 Correct 22 ms 42524 KB Output is correct
4 Correct 22 ms 42624 KB Output is correct
5 Correct 21 ms 42580 KB Output is correct
6 Correct 21 ms 42580 KB Output is correct
7 Correct 23 ms 42480 KB Output is correct
8 Correct 22 ms 42580 KB Output is correct
9 Correct 23 ms 42580 KB Output is correct
10 Correct 22 ms 42580 KB Output is correct
11 Correct 23 ms 42580 KB Output is correct
12 Correct 27 ms 42544 KB Output is correct
13 Correct 23 ms 42580 KB Output is correct
14 Correct 21 ms 42580 KB Output is correct
15 Correct 21 ms 42580 KB Output is correct
16 Correct 22 ms 42548 KB Output is correct
17 Correct 22 ms 42580 KB Output is correct
18 Correct 23 ms 42580 KB Output is correct
19 Correct 22 ms 42572 KB Output is correct
20 Correct 26 ms 42656 KB Output is correct
21 Correct 22 ms 42632 KB Output is correct
22 Correct 23 ms 42580 KB Output is correct
23 Correct 31 ms 44136 KB Output is correct
24 Correct 32 ms 44144 KB Output is correct
25 Correct 31 ms 44100 KB Output is correct
26 Correct 41 ms 45636 KB Output is correct
27 Correct 42 ms 45644 KB Output is correct
28 Correct 46 ms 47044 KB Output is correct
29 Correct 42 ms 46808 KB Output is correct
30 Correct 49 ms 46656 KB Output is correct
31 Correct 50 ms 46492 KB Output is correct

Subtask #4
0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 42588 KB Output is correct
2 Correct 23 ms 42580 KB Output is correct
3 Correct 22 ms 42524 KB Output is correct
4 Correct 22 ms 42624 KB Output is correct
5 Correct 21 ms 42580 KB Output is correct
6 Correct 21 ms 42580 KB Output is correct
7 Correct 23 ms 42480 KB Output is correct
8 Correct 22 ms 42580 KB Output is correct
9 Correct 23 ms 42580 KB Output is correct
10 Correct 22 ms 42580 KB Output is correct
11 Correct 23 ms 42580 KB Output is correct
12 Correct 27 ms 42544 KB Output is correct
13 Correct 23 ms 42580 KB Output is correct
14 Correct 21 ms 42580 KB Output is correct
15 Correct 21 ms 42580 KB Output is correct
16 Correct 22 ms 42548 KB Output is correct
17 Correct 22 ms 42580 KB Output is correct
18 Correct 23 ms 42580 KB Output is correct
19 Correct 22 ms 42572 KB Output is correct
20 Correct 26 ms 42656 KB Output is correct
21 Correct 22 ms 42632 KB Output is correct
22 Correct 23 ms 42580 KB Output is correct
23 Correct 31 ms 44136 KB Output is correct
24 Correct 32 ms 44144 KB Output is correct
25 Correct 31 ms 44100 KB Output is correct
26 Correct 41 ms 45636 KB Output is correct
27 Correct 42 ms 45644 KB Output is correct
28 Correct 46 ms 47044 KB Output is correct
29 Correct 42 ms 46808 KB Output is correct
30 Correct 49 ms 46656 KB Output is correct
31 Correct 50 ms 46492 KB Output is correct
32 Correct 189 ms 57748 KB Output is correct
33 Correct 178 ms 57868 KB Output is correct
34 Correct 171 ms 57804 KB Output is correct
35 Correct 729 ms 105320 KB Output is correct
36 Correct 717 ms 105180 KB Output is correct
37 Correct 779 ms 105260 KB Output is correct
38 Execution timed out 1028 ms 131072 KB Time limit exceeded
39 Halted 0 ms 0 KB -