Submission #220257

#	Time	Username	Problem	Language	Result	Execution time	Memory
220257		Sho10	Subway (info1cup19_subway)	C++14	93.06 / 100	13 ms	1784 KiB

subway

/*
ID: Sho10
LANG: C++
*/
#include <bits/stdc++.h> //Andrei Alexandru a.k.a Sho10
#define ll long long int
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#define all(a) (a).begin(), (a).end()
#define sz size
#define f first
#define s second
#define pb push_back
#define er erase
#define in insert
#define mp make_pair
#define pi pair
#define rc(s) return cout<<s,0
#define endl '\n'
#define mod 1000000007
#define PI 3.14159265359
#define CODE_START  ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
ll n,a[205];
vector<pair<ll,ll>>v;
int32_t main(){
CODE_START;
cin>>n;
v.pb(mp(0,-1));
ll s1=1;
while(n>=1){
    ll val=sqrt(2*n);
    if(val*(val+1)/2>n){
        val--;
    }
    for(ll i=1;i<=val;i++)
    {
        if(i==1){
            v.pb(mp(s1,0));
        }else {
        v.pb(mp(s1,s1-1));
    }
    s1++;
}
n=n-val*(val+1)/2;
}
cout<<v.size()<<endl;
for(ll i=0;i<v.size();i++)
    cout<<v[i].f<<' '<<v[i].s<<endl;
}

Compilation message (stderr)

subway.cpp: In function 'int32_t main()':
subway.cpp:48:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 for(ll i=0;i<v.size();i++)
            ~^~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 43.0555555556 / 50