oj.uz

답안 #772993

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
772993 2023-07-04T13:49:59 Z davitmarg Power Plant (JOI20_power) C++17
6 / 100
 16 ms 12340 KB 
/*
DavitMarg
In pr honky-tonk,
Down in Mexico
*/
#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <algorithm>
#include <cmath>
#include <vector>
#include <string>
#include <cstring>
#include <map>
#include <unordered_map>
#include <set>
#include <unordered_set>
#include <queue>
#include <bitset>
#include <stack>
#include <cassert>
#include <iterator>
#include <random>
#include <chrono>
#define mod 1000000007ll
#define LL long long
#define LD long double
#define MP make_pair    
#define PB push_back
#define all(v) v.begin(), v.end()
#define fastIO ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
using namespace std;

const int N = 500005;

int n;
string s;
vector<int> g[N];
int dp[N];

int dfs(int v, int p, bool start = false)
{
    dp[v] = s[v] - '0';
    int sum = 0;
    int mx = 0;
    for(int i = 0; i < g[v].size(); i++)
    {
        int to = g[v][i];
        if(to == p)
            continue;
        sum += dfs(to, v);
        mx = max(dp[to], mx);
    }
    dp[v] = max(dp[v], sum - (s[v] - '0'));
    if(start)
        dp[v] = max(dp[v], (s[v] - '0') + mx);
    return dp[v];
}

int myRand()
{
    return (rand() << 16) + rand();
}

void solve()
{
    cin >> n;
    for(int i = 1; i <= n - 1; i++)
    {
        int a, b;
        cin >> a >> b;
        g[a].PB(b);
        g[b].PB(a);
    }
    cin>>s;
    s = '#' + s;
    int ans = 0;

    vector<int> p;
    for(int i = 1; i <= n; i++)
        if(s[i] == '1')
            p.PB(i);

    for(int i = 0; i < 300; i++)
    {
        int v = p[myRand() % p.size()];
        ans = max(ans, dfs(v, -1, true));
    }
    cout<<ans<<endl;
}

int main()
{
    fastIO;
    int T = 1;
    //cin >> T;
    while (T--)
    {
        solve();
    }

    return 0;
}

/*


cd /mnt/d/Davit/Projects/VSCode; g++ -std=c++17 -O2 -Wall -Wextra -Ddeath -Wshadow source.cpp -o orz; ./orz; rm orz

*/

Compilation message

power.cpp: In function 'int dfs(int, int, bool)':
power.cpp:45:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |     for(int i = 0; i < g[v].size(); i++)
      |                    ~~^~~~~~~~~~~~~

Subtask #1
6.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 11988 KB Output is correct
2 Correct 7 ms 11988 KB Output is correct
3 Correct 5 ms 11988 KB Output is correct
4 Correct 6 ms 12036 KB Output is correct
5 Correct 6 ms 12000 KB Output is correct
6 Correct 6 ms 11988 KB Output is correct
7 Correct 7 ms 11988 KB Output is correct
8 Correct 6 ms 11988 KB Output is correct
9 Correct 6 ms 11988 KB Output is correct
10 Correct 6 ms 11976 KB Output is correct
11 Correct 6 ms 11988 KB Output is correct
12 Correct 5 ms 11988 KB Output is correct
13 Correct 6 ms 11988 KB Output is correct
14 Correct 6 ms 11956 KB Output is correct
15 Correct 6 ms 11988 KB Output is correct
16 Correct 5 ms 11972 KB Output is correct
17 Correct 5 ms 11988 KB Output is correct
18 Correct 6 ms 12000 KB Output is correct
19 Correct 6 ms 11944 KB Output is correct
20 Correct 5 ms 11988 KB Output is correct
21 Correct 6 ms 11988 KB Output is correct

Subtask #2
0.0 / 41.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 11988 KB Output is correct
2 Correct 7 ms 11988 KB Output is correct
3 Correct 5 ms 11988 KB Output is correct
4 Correct 6 ms 12036 KB Output is correct
5 Correct 6 ms 12000 KB Output is correct
6 Correct 6 ms 11988 KB Output is correct
7 Correct 7 ms 11988 KB Output is correct
8 Correct 6 ms 11988 KB Output is correct
9 Correct 6 ms 11988 KB Output is correct
10 Correct 6 ms 11976 KB Output is correct
11 Correct 6 ms 11988 KB Output is correct
12 Correct 5 ms 11988 KB Output is correct
13 Correct 6 ms 11988 KB Output is correct
14 Correct 6 ms 11956 KB Output is correct
15 Correct 6 ms 11988 KB Output is correct
16 Correct 5 ms 11972 KB Output is correct
17 Correct 5 ms 11988 KB Output is correct
18 Correct 6 ms 12000 KB Output is correct
19 Correct 6 ms 11944 KB Output is correct
20 Correct 5 ms 11988 KB Output is correct
21 Correct 6 ms 11988 KB Output is correct
22 Correct 12 ms 12116 KB Output is correct
23 Correct 12 ms 12116 KB Output is correct
24 Correct 12 ms 12172 KB Output is correct
25 Correct 13 ms 12116 KB Output is correct
26 Correct 14 ms 12028 KB Output is correct
27 Correct 16 ms 12072 KB Output is correct
28 Correct 15 ms 12152 KB Output is correct
29 Correct 16 ms 12340 KB Output is correct
30 Correct 15 ms 12220 KB Output is correct
31 Correct 12 ms 12116 KB Output is correct
32 Correct 12 ms 12028 KB Output is correct
33 Incorrect 13 ms 12160 KB Output isn't correct
34 Halted 0 ms 0 KB -

Subtask #3
0.0 / 53.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 11988 KB Output is correct
2 Correct 7 ms 11988 KB Output is correct
3 Correct 5 ms 11988 KB Output is correct
4 Correct 6 ms 12036 KB Output is correct
5 Correct 6 ms 12000 KB Output is correct
6 Correct 6 ms 11988 KB Output is correct
7 Correct 7 ms 11988 KB Output is correct
8 Correct 6 ms 11988 KB Output is correct
9 Correct 6 ms 11988 KB Output is correct
10 Correct 6 ms 11976 KB Output is correct
11 Correct 6 ms 11988 KB Output is correct
12 Correct 5 ms 11988 KB Output is correct
13 Correct 6 ms 11988 KB Output is correct
14 Correct 6 ms 11956 KB Output is correct
15 Correct 6 ms 11988 KB Output is correct
16 Correct 5 ms 11972 KB Output is correct
17 Correct 5 ms 11988 KB Output is correct
18 Correct 6 ms 12000 KB Output is correct
19 Correct 6 ms 11944 KB Output is correct
20 Correct 5 ms 11988 KB Output is correct
21 Correct 6 ms 11988 KB Output is correct
22 Correct 12 ms 12116 KB Output is correct
23 Correct 12 ms 12116 KB Output is correct
24 Correct 12 ms 12172 KB Output is correct
25 Correct 13 ms 12116 KB Output is correct
26 Correct 14 ms 12028 KB Output is correct
27 Correct 16 ms 12072 KB Output is correct
28 Correct 15 ms 12152 KB Output is correct
29 Correct 16 ms 12340 KB Output is correct
30 Correct 15 ms 12220 KB Output is correct
31 Correct 12 ms 12116 KB Output is correct
32 Correct 12 ms 12028 KB Output is correct
33 Incorrect 13 ms 12160 KB Output isn't correct
34 Halted 0 ms 0 KB -