Submission #918744

#	Time	Username	Problem	Language	Result	Execution time	Memory
918744		Abito	Line Town (CCO23_day1problem3)	C++17	0 / 25	0 ms	344 KiB

Main

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#define F first
#define S second
#define pb push_back
#define ppb pop_back
#define ep insert
#define endl '\n'
#define elif else if
#define pow pwr
#define sqrt sqrtt
//#define int long long
#define ll long long
#define y1 YONE
#define free freeee
#define lcm llcm
typedef unsigned long long ull;
using namespace std;
const int N=5e5+5;
int a[N],n;
int32_t main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
    cin>>n;
    for (int i=1;i<=n;i++) cin>>a[i];
    int ans=INT_MAX;
    for (int i=1;i<=n+1;i++){
        int x=0;bool ok=true;
        for (int j=1;j<i;j++){
            if (a[j]==-1) continue;
            int r=j;
            for (int k=j;k<i;k++){
                if (a[k]==1) r=k;
                else break;
            }
            if ((r-j+1)%2==0) x+=(r-j+1)/2;
            else ok=false;
            j=r;
        }
        for (int j=i;j<=n;j++){
            if (a[j]==1) continue;
            int r=j;
            for (int k=j;k<=n;k++){
                if (a[k]==-1) r=k;
                else break;
            }
            if ((r-j+1)%2==0) x+=(r-j+1)/2;
            else ok=false;
            j=r;
        }if (ok) ans=min(x,ans);
    }if (ans==INT_MAX) ans=-1;
    cout<<ans<<endl;
    return 0;
}

• Subtask 1: 0 / 3
• Subtask 2: 0 / 3
• Subtask 3: 0 / 3
• Subtask 4: 0 / 4
• Subtask 5: 0 / 4
• Subtask 6: 0 / 3
• Subtask 7: 0 / 2
• Subtask 8: 0 / 3