Submission #1205769

#	Time	Username	Problem	Language	Result	Execution time	Memory
1205769		Aiperiii	Stranded Far From Home (BOI22_island)	C++20	0 / 100	1095 ms	14856 KiB

island

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define all(x) x.begin(),x.end()
#define ff first
#define ss second
#define pb push_back
const int N=2e5+5;
vector <int> g[N];
int sum[N],a[N],ok[N];
void rec(int l,int r){
    
    if(l==r){
        ok[l]=1;
        return;
    }
    int mx=0,sum=0,fr=0,ind=0;
    for(int i=l;i<=r;i++){
        
        sum+=a[i];
        if(a[i]>mx){
            mx=a[i];
            ind=i;
            fr=sum;
        }
    }
    ok[ind]=1;
    int sum1=fr-mx;
    int sum2=sum-fr;
    if(sum1>=mx && l<=ind-1){
        rec(l,ind-1);
    }
    if(sum2>=mx && ind+1<=r){
        rec(ind+1,r);
    }
}
signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    int n,m;
    cin>>n>>m;
    
    for(int i=1;i<=n;i++){
        cin>>a[i];
    }
    while(m--){
        int u,v;
        cin>>u>>v;
        g[u].pb(v);
        g[v].pb(u);
    }
    rec(1,n);
    for(int i=1;i<=n;i++)cout<<ok[i];
}
/*
 4 4
 2 2 4 3
 1 2
 1 3
 2 3
 3 4
 
 4 3
 4 2 2 1
 1 2
 3 2
 4 1
 
 10 9
 10 9 8 7 4 4 3 2 1 1
 1 2
 1 3
 2 4
 3 5
 5 7
 5 8
 7 9
 8 10
 3 6
 
 1110101000
 
 
   1 1 1 1      1
 2 3 4 5 10 3 2 6 3
*/

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 30
• Subtask 5: 0 / 35