제출 #1287811

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1287811		muhammad-mutahir	Line Town (CCO23_day1problem3)	C++20	0 / 25	1 ms	572 KiB

Main

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

#define print(l) for(auto i:l) cout<<i<<" ";cout<<endl;
#define input(t,l,n) vector<t>l(n);for(int i = 0;i<n;i++)cin>>l[i];
#define int long long
#define pb push_back
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update> 
#define all(l) l.begin(),l.end()
#define pii pair<int,int>
#define fi first
#define se second

const int M = 1e9+7;
const int inf = 1e18;


int bp(int x, int y, int p){
    int res = 1;
    x = x % p;
    while (y > 0) {
 
        if (y & 1)
            res = (res * x) % p;
        y = y >> 1;
        x = (x * x) % p;
    }
    return res;
}
 
int MI(int n, int p){
    return bp(n, p - 2, p);
}
int mul(int x,int y, int p){
    return x * 1ull * y % p;
}
int di(int x,int y, int p){
    return mul(x, MI(y, p), p);
}


int n , m , k , q;

void solve(int testcase_number){
    cin>>n;
    input(int,l,n);
    while(l.back() == 1){
    	l.pop_back();
    }
    reverse(all(l));
    while(l.back() == -1){
    	l.pop_back();
    }
    
    reverse(all(l));
    n = l.size();
    // print(l);
    vector<vector<int>>comps;
    int f = l[0];
    int i = 0;
    vector<int>t;
    while(i<n){
    	while(l[i] == f){
    		t.pb(l[i]);
    		i++;
    	}
    	f = l[i];
    	comps.pb(t);
    	t = {};
    }
    int ne = 1;
    int po = 1;
    int toup = 1;
    int ans1 = 0;
    int fne = 0;
    int ans2 = 0;
    for(auto i:comps){
    	// print(i);
    	if(i[0] == -1){
    		if(i.size()%2 !=0){
    			ne = 0;
    		}
    		else{
    			ans1+=(i.size()/2);
    		}
    	}
    	else{

    		if(i.size()%2!=0){
    			// toup = 0;
    			po =0 ;
    		}
    		else{
    			ans2+=(i.size()/2);
    		}
    	}
    }
    // cout<<ne<<" "<<po<<endl;
    if(ne == 0 and po == 0){
    	cout<<-1<<endl;
    }
    else if(ne == 0 and po == 1){
    	cout<<ans2<<endl;
    }
    else if(ne == 1 and po == 0){
    	cout<<ans1<<endl;
    }
    else{
    	cout<<min(ans1,ans2)<<endl;
    }



}


signed main(){
    ios::sync_with_stdio(0);//DO NOT USE IN INTERACTIVE
    cin.tie(0), cout.tie(0);
    cout << fixed<<setprecision(9);

    int t = 1;
    // cin>>t;
    for(int i = 1;i<=t;i++){
        solve(i);
    }

}

• 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