Submission #228881

#	Time	Username	Problem	Language	Result	Execution time	Memory
228881		blacktulip	Subway (info1cup19_subway)	C++17	100 / 100	16 ms	1652 KiB

subway

#include <bits/stdc++.h>

using namespace std;

typedef long long lo;
typedef pair< lo,lo > PII;

#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define fio() ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define FOR for(int i=1;i<=n;i++)
#define mid ((start+end)/2)
#define ort ((bas+son)/2)

const lo MAX = -1000000000000000000;
const lo MIN = 1000000000000000000;
const lo inf = 1000000000;
const lo KOK = 100000;
const lo LOG = 30;
const lo li = 500005;
const lo mod = 1000000007;

int n,m,b[li],a[li],k,flag,t,sira;
int cev;
string s;
vector<PII> v;

int main(void){
	scanf("%d",&n);
	v.pb(mp(0,-1));
	while(n>0){
		if(sira+1<=n){sira++;v.pb(mp(sira,sira-1));n-=sira;}
		else{sira++;v.pb(mp(sira,n-1));n=0;}
	}
	printf("%d\n",(int)v.size());
	for(int i=0;i<(int)v.size();i++){
		printf("%lld %lld\n",v[i].fi,v[i].se);
	}
	return 0;
}

Compilation message (stderr)

subway.cpp: In function 'int main()':
subway.cpp:31:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~

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