Submission #1016141

#	Time	Username	Problem	Language	Result	Execution time	Memory
1016141		ByeWorld	Power Plant (JOI20_power)	C++14	100 / 100	139 ms	32480 KiB

power

#include <bits/stdc++.h>
#pragma GCC optimize("O3", "unroll-loops")
#define ll long long
// #define int long long
#define pb push_back
#define fi first
#define se second
#define lf (id<<1)
#define rg ((id<<1)|1)
#define md ((l+r)/2)
#define ld long double
using namespace std;
typedef pair<int,int> pii;
typedef pair<pii, int> ipii;
const int MAXN = 3e5+10;
const int MAXA = 1e6+10;
const int INF = 1e9+10;
// const int INF2 = 1e18+10;
const int LOG = 19;
const int MOD = 1e9+7;
const int SQRT = 450;
const vector<int> NOL = {};
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const vector<int> dx = {1, -1, 0, 0};
const vector<int> dy = {0, 0, 1, -1};
void chmn(int &a, int b){ a = min(a, b); }
void chmx(int &a, int b){ a = max(a, b); }

int n, a[MAXN];
vector <int> adj[MAXN];

int te = 0, ANS = 0, val[MAXN];
void dfs(int nw, int par){
    val[nw] = 0;
    for(auto nx : adj[nw]){
        if(nx==par) continue;
        dfs(nx, nw);
    }
    int mx = 0;
    for(auto nx : adj[nw]){
        if(nx==par) continue;
        val[nw] += val[nx];
        chmx(mx, val[nx]);
    }
    if(a[nw]){
        val[nw] = max(val[nw]-1, 1);
        chmx(ANS, mx+1);
    }

    chmx(ANS, val[nw]);
}

signed main(){
    cin >> n;
    for(int i=1; i<=n-1; i++){
        int x, y; cin >> x >> y;
        adj[x].pb(y); adj[y].pb(x);
    }
    string x; cin >> x; int tot = 0;
    for(int i=1; i<=n; i++){
        a[i] = (int)(x[i-1]-'0'); tot += a[i];
    }

        dfs(1, 0); 
    cout << ANS << '\n';
}

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