Submission #441383

#	Time	Username	Problem	Language	Result	Execution time	Memory
441383		sam571128	Alternating Current (BOI18_alternating)	C++17	13 / 100	3069 ms	3576 KiB

alternating

#include <bits/stdc++.h>

#define int long long
#define fastio ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

using namespace std;

signed main(){
    //fastio
    int n,m;
    cin >> n >> m;
    vector<pair<int,int>> v;
    for(int i = 0;i < m;i++){
        int l,r;
        cin >> l >> r;
        l--, r--;
        v.push_back({l,r});
    }

    for(int i = 0;i < (1<<m);i++){
        int cnt[n] = {};
        for(int j = 0;j < m;j++){
            if(i&(1<<j)){
                int l = v[j].first, r = v[j].second;
                while(true){
                    cnt[l] |= 2;
                    if(l==r) break;
                    l = (l+1)%n;
                }
            }else{
                int l = v[j].first, r = v[j].second;
                while(true){
                    cnt[l] |= 1;
                    if(l==r) break;
                    l = (l+1)%n;
                }
            }
        }
        bool check = true;
        for(int j = 0;j < n;j++){
            if(cnt[j]!=3){
                check = false;
            }
        }

        if(check){
            for(int j = 0;j < m;j++){
                if(i&(1<<j)) cout << 0;
                else cout << 1;
            }
            cout << "\n";
            return 0;
        }
    }
    cout << "impossible\n";
}

• Subtask 1: 13 / 13
• Subtask 2: 0 / 20
• Subtask 3: 0 / 22
• Subtask 4: 0 / 19
• Subtask 5: 0 / 26