Submission #645485

#	Time	Username	Problem	Language	Result	Execution time	Memory
645485		mychecksedad	Alternating Current (BOI18_alternating)	C++17	13 / 100	3087 ms	827568 KiB

alternating

/* Author : Mychecksdead */
#include<bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef long double ld;
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define PI 3.1415926535
#define pb push_back
#define setp() cout << setprecision(15)
#define all(x) x.begin(), x.end()
#define debug(x) cerr << #x << " is " << x << '\n';
const int N = 1e6+100, M = 1e5+10, F = 2147483646, K = 20;



int n, m;
vector<int> v[N];
void solve(){
    cin >> n >> m;  
    for(int i = 0; i < m; ++i){
        int x, y; cin >> x >> y;
        x--, y--;
        if(x>y){
            for(int j = x; j < n; ++j) v[j].pb(i);
            for(int j = 0; j <= y; ++j) v[j].pb(i);
        }else{
            for(int j = x; j <= y; ++j) v[j].pb(i);
        }
    }
    for(int mask = 0; mask < (1<<m); ++mask){
        bool ok = 1;
        for(int i = 0; i < n; ++i){
            bool a = 0, b = 0;
            for(int x: v[i]){
                a |= (mask&(1<<x)) > 0;
                b |= (mask&(1<<x)) == 0;
            }
            if(!(a && b)){
                ok = 0;
            }
        }
        if(ok){
            for(int i = 0; i < m; ++i) cout << ((mask&(1<<i))>0);
            return;
        }
    }
    cout << "impossible";
}





int main(){
    cin.tie(0); ios::sync_with_stdio(0);
    int T = 1, aa;
    // cin >> T;aa=T;
    while(T--){
        // cout << "Case #" << aa-T << ": ";
        solve();
        cout << '\n';
    }
    return 0;
 
}

Compilation message (stderr)

alternating.cpp: In function 'int main()':
alternating.cpp:57:16: warning: unused variable 'aa' [-Wunused-variable]
   57 |     int T = 1, aa;
      |                ^~

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