Submission #1037114

#	Time	Username	Problem	Language	Result	Execution time	Memory
1037114		1L1YA	Power Plant (JOI20_power)	C++17	Compilation error	0 ms	0 KiB

power

//1L1YA

#include<bits/stdc++.h>
using namespace std;

//#pragma GCC optimize ("O3,unrool-loops")
//#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")

typedef long long       ll;
typedef pair<ll,ll>     pll;
typedef pair<int,int>   pii;

#define Pb              push_back
#define F               first
#define S               second
#define endl            '\n'
#define sep             ' '
#define all(x)          x.begin(),x.end()
#define al(x,n)         x+1,x+n+1
#define SZ(x)           ((int)x.size())
#define lc              (id<<1)
#define rc              (lc|1)
#define mid             (l+r>>1)
#define dokme(x)        cout << x << endl, exit(0)
#define sik(x)          cout << x << endl;continue;
#define FastIO          ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define FileIO          freopen("input.txt","r",stdin);freopen("output.txt","w",stdout);

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const ll oo=1e18;
const int mod=1e9+7;
const int inf=1e9+111;
const int N=2e5+11;
const int lg=23;

int n,ans,a[N],dp[N];
vector<int> adj[N];

void dfs(int v,int p=0){
	int mx=0;
	for(int u: adj[v])
		if(u!=p){
			dfs(u,v);
			dp[v]+=dp[u];
			mx=max(mx,dp[u]);
		}
	dp[v]-=a[v];
	ans=max(ans,mx+a[v]);
	dp[v]=max(dp[v],a[]);
	ans=max(ans,dp[v]);
}

int main(){
	FastIO

	cin >> n;
	for(int i=1;i<n;i++){
		int u,v;
		cin >> u >> v;
		adj[u].Pb(v);
		adj[v].Pb(u);
	}
	for(int i=1;i<=n;i++){
		char c;cin >> c;
		a[i]=c-'0';
	}
	dfs(1);
	cout << ans << endl;

	return 0;
}

Compilation message (stderr)

power.cpp: In function 'void dfs(int, int)':
power.cpp:50:20: error: expected primary-expression before ']' token
   50 |  dp[v]=max(dp[v],a[]);
      |                    ^