Submission #171284

#	Time	Username	Problem	Language	Result	Execution time	Memory
171284		mehrdad_sohrabi	Alternating Current (BOI18_alternating)	C++14	19 / 100	148 ms	7544 KiB

alternating

#include <bits/stdc++.h>
typedef long long int ll;
typedef long double ld;
#define pb push_back
#define pii pair < ll , ll >
#define F first
#define S second
#define endl '\n'
#define int long long
#define sync ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
#pragma GCC optimize ("Ofast")
#pragma GCC optimize ("unroll-loops")
using namespace std;
/// khodaya komak kon
/// ya navid navid
const int N=1e5+100;
vector <pii> g[N];
ll ans[N];
int32_t main(){
    ll n,m;
    cin >> n >> m;
    for (int i=0;i<m;i++){
        ll a,b;
        cin >> a >> b;
        g[a].pb({b,i});
    }
    for (int i=1;i<=n;i++){
        sort(g[i].begin(),g[i].end());
        reverse(g[i].begin(),g[i].end());
    }
    ll cnt1=0,cnt=0;
    for (int i=1;i<=n;i++){
        for (int j=0;j<g[i].size();j++){
            ll k=g[i][j].F;
            if (cnt<cnt1){
                if (cnt>=i-1){
                    cnt=max(cnt,k);
                    ans[g[i][j].S]=0;
                }
                continue;
            }
            else{
                if (cnt1>=i-1){
                    cnt1=max(cnt1,k);
                    ans[g[i][j].S]=1;
                }

            }
        }
    }
    if (cnt==n && cnt1==n){
        for (int i=0;i<m;i++){
            cout << ans[i];
        }
        return 0;
    }
    cout << "impossible" << endl;

}
    

Compilation message (stderr)

alternating.cpp: In function 'int32_t main()':
alternating.cpp:33:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int j=0;j<g[i].size();j++){
                      ~^~~~~~~~~~~~

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