Submission #588736

#	Time	Username	Problem	Language	Result	Execution time	Memory
588736		Loki_Nguyen	Power Plant (JOI20_power)	C++14	0 / 100	4 ms	7380 KiB

power

#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define task "test"
#define pll pair<ll, ll>
#define pii pair<ll, pll>
#define fi first
#define se second
#define ull unsigned long long
using namespace std;
const ll mod = 1e15 + 7;
const ll N = 3e5 + 5;
const ll M = 1e6 + 5;
vector<ll> adj[N];
vector<ll> kq;
int n, m, t, k, b[N], lab[N],  a[N], ans, tong, d[N];
string s;
pll p[N];
void sol()
{
    cin >> n;
    for (int i = 1; i < n; i++)
    {
        int x, y;
        cin >> x >> y;
        adj[x].pb(y);
        adj[y].pb(x);
        ++d[x];
        ++d[y];
    }
    cin >> s;
    queue<int> q;
    for(int i = 1; i <= n; i ++)if(d[i] == 1)q.push(i);
    while(!q.empty())
    {
        int u = q.front();
        q.pop();
        if(s[u-1] == '1')
        {
            ++ans;
            continue;
        }
        for(int v: adj[u])
        {
            --d[v];
            if(d[v] == 1)q.push(v);
        }
    }
    cout << ans;
}
int main()
{
    if (fopen(task ".in", "r"))
    {
        freopen(task ".in", "r", stdin);
        freopen(task ".out", "w", stdout);
    }
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int ntest = 1;
    // cin >> ntest;
    while (ntest-- > 0)
        sol();    
}

Compilation message (stderr)

power.cpp: In function 'int main()':
power.cpp:55:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |         freopen(task ".in", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
power.cpp:56:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   56 |         freopen(task ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 6
• Subtask 2: 0 / 41
• Subtask 3: 0 / 53