Submission #206666

#	Time	Username	Problem	Language	Result	Execution time	Memory
206666		mayhoubsaleh	Subway (info1cup19_subway)	C++14	100 / 100	96 ms	1016 KiB

subway

#include <bits/stdc++.h>
#include <string>
#define ll long long
#define pb push_back
#define IOS ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);

using namespace std;
const int maxn=222;
int par[100005];
int k;
int main()
{
    IOS
    cin>>k;
    int cur=0;
    while(k>=cur){
        k-=cur;
        par[cur]=cur-1;
        cur++;
    }
    if(k){
        par[cur]=k-1;
        cur++;
    }
    cout<<cur<<endl;
    for(int i=0;i<cur;i++){
        cout<<i<<' '<<par[i]<<endl;
    }
    return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 50 / 50