CSES - Datatähti Open 2019 - Results
Submission details
Task:Function
Sender:pwild
Submission time:2019-01-19 22:22:04
Language:C++
Status:READY
Result:100
Feedback
groupverdictscore
#1ACCEPTED45
#2ACCEPTED55
Test results
testverdicttimegroup
#1ACCEPTED0.02 s1details
#2ACCEPTED0.01 s1details
#3ACCEPTED0.02 s1details
#4ACCEPTED0.02 s1details
#5ACCEPTED0.07 s1details
#6ACCEPTED0.02 s1details
#7ACCEPTED0.02 s1details
#8ACCEPTED0.03 s1details
#9ACCEPTED0.02 s1details
#10ACCEPTED0.01 s2details
#11ACCEPTED0.03 s2details
#12ACCEPTED0.02 s2details
#13ACCEPTED0.02 s2details
#14ACCEPTED0.07 s2details
#15ACCEPTED0.07 s2details
#16ACCEPTED0.06 s2details
#17ACCEPTED0.08 s2details
#18ACCEPTED0.06 s2details
#19ACCEPTED0.06 s2details
#20ACCEPTED0.06 s2details
#21ACCEPTED0.02 s2details
#22ACCEPTED0.58 s2details
#23ACCEPTED0.53 s2details
#24ACCEPTED0.51 s2details
#25ACCEPTED0.62 s2details
#26ACCEPTED0.50 s2details
#27ACCEPTED0.53 s2details
#28ACCEPTED0.32 s2details
#29ACCEPTED0.42 s2details
#30ACCEPTED0.02 s2details
#31ACCEPTED0.01 s2details
#32ACCEPTED0.01 s2details
#33ACCEPTED0.02 s2details
#34ACCEPTED0.07 s2details
#35ACCEPTED0.56 s2details

Code

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef pair<ll,ll> pll;
typedef vector<bool> vb;
const ll oo = 0x3f3f3f3f3f3f3f3f;
const double eps = 1e-9;
#define sz(c) ll((c).size())
#define all(c) begin(c), end(c)
#define FOR(i,a,b) for (ll i = (a); i < (b); i++)
#define FORD(i,a,b) for (ll i = (b)-1; i >= (a); i--)
#define mp make_pair
#define mt make_tuple
#define pb push_back
#define eb emplace_back
#define xx first
#define yy second
#define has(c,i) ((c).find(i) != end(c))
#define TR(X) ({ if(1) cerr << "TR: " << (#X) << " = " << (X) << endl; })

struct point { ll x, y; };

point operator-(point a, point b) { return {a.x-b.x, a.y-b.y}; }

ll operator%(point a, point b) { return a.x*b.y - a.y*b.x; }

ll quadrant(point a) {
	ll res = 0;
	while (!(a.x > 0 && a.y >= 0)) {
		a = {a.y,-a.x};
		res++;
	}
	return res;
}

bool operator<(point a, point b) {
	ll qa = quadrant(a), qb = quadrant(b);
	if (qa != qb) return qa < qb;
	if (ll cross = a % b) return cross > 0;
	return abs(a.x)+abs(a.y) < abs(b.x)+abs(b.y);
}

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	
	ll tc; cin >> tc;
	while (tc--) {
		ll n; cin >> n;
		
		vector<point> a(n);
		FOR(i,0,n) cin >> a[i].x >> a[i].y;

		vector<point> b(n-1);
		FOR(i,0,n-1) b[i] = a[i+1]-a[i];
		sort(all(b));

		bool res = n == 2;

		FOR(i,0,n-1) {
			point p = b[i], q = b[(i+1)%(n-1)];
			if (p%q < 0) res = true;
		}
		
		cout << (res ? "YES" : "NO") << endl;
	}
}

Test details

Test 1

Group: 1

Verdict: ACCEPTED

input
12
2
0 0
1 1
5
...

correct output
YES
YES
NO
YES
YES
...

user output
YES
YES
NO
YES
YES
...

Test 2

Group: 1

Verdict: ACCEPTED

input
100
2
92 30
22 44
2
...

correct output
YES
YES
YES
YES
YES
...

user output
YES
YES
YES
YES
YES
...

Test 3

Group: 1

Verdict: ACCEPTED

input
100
3
-55 -98
-59 -55
-2 88
...

correct output
YES
YES
YES
YES
YES
...

user output
YES
YES
YES
YES
YES
...

Test 4

Group: 1

Verdict: ACCEPTED

input
100
4
87 81
-84 42
18 -46
...

correct output
YES
YES
YES
YES
YES
...

user output
YES
YES
YES
YES
YES
...

Test 5

Group: 1

Verdict: ACCEPTED

input
100
1000
-81 38
92 -21
-10 -65
...

correct output
NO
NO
NO
NO
NO
...

user output
NO
NO
NO
NO
NO
...

Test 6

Group: 1

Verdict: ACCEPTED

input
100
110
-99 -9
-98 -9
-96 -8
...

correct output
NO
NO
NO
NO
NO
...

user output
NO
NO
NO
NO
NO
...

Test 7

Group: 1

Verdict: ACCEPTED

input
100
78
-100 95
-99 96
-98 95
...

correct output
NO
NO
NO
NO
NO
...

user output
NO
NO
NO
NO
NO
...

Test 8

Group: 1

Verdict: ACCEPTED

input
100
201
-100 97
-100 96
-99 99
...

correct output
NO
NO
NO
NO
NO
...

user output
NO
NO
NO
NO
NO
...

Test 9

Group: 1

Verdict: ACCEPTED

input
100
45
-100 89
-100 90
-97 90
...

correct output
YES
NO
NO
NO
NO
...

user output
YES
NO
NO
NO
NO
...

Test 10

Group: 2

Verdict: ACCEPTED

input
13
2
0 0
1 1
5
...

correct output
YES
YES
NO
YES
YES
...

user output
YES
YES
NO
YES
YES
...

Test 11

Group: 2

Verdict: ACCEPTED

input
100
2
-517113909 -39540276
-209411537 -831819487
2
...

correct output
YES
YES
YES
YES
YES
...

user output
YES
YES
YES
YES
YES
...

Test 12

Group: 2

Verdict: ACCEPTED

input
100
3
-991349544 139282777
646238126 16140762
-4488261 817588303
...

correct output
YES
YES
YES
YES
YES
...

user output
YES
YES
YES
YES
YES
...

Test 13

Group: 2

Verdict: ACCEPTED

input
100
4
891187584 -889373775
-453505448 -469134344
-683807769 8725517
...

correct output
YES
NO
YES
NO
NO
...

user output
YES
NO
YES
NO
NO
...

Test 14

Group: 2

Verdict: ACCEPTED

input
100
1000
-866614983 -994037153
775605588 -328510132
390868551 927606059
...

correct output
NO
NO
NO
NO
NO
...

user output
NO
NO
NO
NO
NO
...

Test 15

Group: 2

Verdict: ACCEPTED

input
100
1000
-911073332 -1000000000
-905159999 -1000000000
-904949593 -999999999
...

correct output
YES
YES
YES
NO
NO
...

user output
YES
YES
YES
NO
NO
...

Test 16

Group: 2

Verdict: ACCEPTED

input
100
1000
-1000000000 950042028
-946551105 -1000000000
-940508390 -1000000000
...

correct output
NO
YES
YES
YES
NO
...

user output
NO
YES
YES
YES
NO
...

Test 17

Group: 2

Verdict: ACCEPTED

input
100
1000
-949977239 -1000000000
-948279892 -1000000000
-947497811 -999999999
...

correct output
YES
YES
YES
YES
YES
...

user output
YES
YES
YES
YES
YES
...

Test 18

Group: 2

Verdict: ACCEPTED

input
100
806
-899 -1000
-898 -1000
-896 -999
...

correct output
NO
NO
NO
NO
NO
...

user output
NO
NO
NO
NO
NO
...

Test 19

Group: 2

Verdict: ACCEPTED

input
100
777
-1000 914
-1000 915
-999 916
...

correct output
NO
NO
NO
NO
NO
...

user output
NO
NO
NO
NO
NO
...

Test 20

Group: 2

Verdict: ACCEPTED

input
100
775
-999 998
-995 -1000
-994 -1000
...

correct output
NO
NO
NO
NO
NO
...

user output
NO
NO
NO
NO
NO
...

Test 21

Group: 2

Verdict: ACCEPTED

input
13
2
0 0
1 1
5
...

correct output
YES
YES
NO
YES
YES
...

user output
YES
YES
NO
YES
YES
...

Test 22

Group: 2

Verdict: ACCEPTED

input
1
999748
-995394098 -1000000000
-995392159 -1000000000
-995386584 -999999999
...

correct output
NO

user output
NO

Test 23

Group: 2

Verdict: ACCEPTED

input
1
1000000
-954368893 -1000000000
-954366895 -1000000000
-954364896 -999999999
...

correct output
YES

user output
YES

Test 24

Group: 2

Verdict: ACCEPTED

input
1
1000000
-1000000000 928772368
-1000000000 928772506
-999999999 928772642
...

correct output
YES

user output
YES

Test 25

Group: 2

Verdict: ACCEPTED

input
1
999754
-901705699 -1000000000
-901702695 -1000000000
-901702062 -999999999
...

correct output
NO

user output
NO

Test 26

Group: 2

Verdict: ACCEPTED

input
100
10000
-1000000000 919783772
-918885599 -1000000000
-918825263 -1000000000
...

correct output
NO
YES
YES
NO
NO
...

user output
NO
YES
YES
NO
NO
...

Test 27

Group: 2

Verdict: ACCEPTED

input
10
99998
-997024120 -77018772
-997011201 -77017738
-996986132 -77015834
...

correct output
YES
YES
NO
YES
YES
...

user output
YES
YES
NO
YES
YES
...

Test 28

Group: 2

Verdict: ACCEPTED

input
100
7934
-10000 9905
-10000 9906
-9999 9906
...

correct output
NO
NO
NO
NO
NO
...

user output
NO
NO
NO
NO
NO
...

Test 29

Group: 2

Verdict: ACCEPTED

input
100
9710
-99754 -6983
-99786 -6055
-99751 -6548
...

correct output
YES
NO
NO
NO
NO
...

user output
YES
NO
NO
NO
NO
...

Test 30

Group: 2

Verdict: ACCEPTED

input
100
2
802396401 -641287652
30956766 -527704723
2
...

correct output
YES
YES
YES
YES
YES
...

user output
YES
YES
YES
YES
YES
...

Test 31

Group: 2

Verdict: ACCEPTED

input
100
3
755025461 -953536159
-402145543 137775005
-700733185 821755784
...

correct output
YES
YES
YES
YES
YES
...

user output
YES
YES
YES
YES
YES
...

Test 32

Group: 2

Verdict: ACCEPTED

input
100
4
-673213071 571383249
-963633735 -859013318
-591788323 791136643
...

correct output
NO
NO
NO
NO
YES
...

user output
NO
NO
NO
NO
YES
...

Test 33

Group: 2

Verdict: ACCEPTED

input
100
5
-124483012 623794901
233757283 -234519096
-987338502 737259422
...

correct output
NO
NO
YES
NO
NO
...

user output
NO
NO
YES
NO
NO
...

Test 34

Group: 2

Verdict: ACCEPTED

input
100
1000
154383911 872030445
-9594726 190227899
908758769 -9615631
...

correct output
NO
NO
NO
NO
NO
...

user output
NO
NO
NO
NO
NO
...

Test 35

Group: 2

Verdict: ACCEPTED

input
100
10000
642800667 -694556052
-343795089 -341227394
800920828 676674460
...

correct output
NO
NO
NO
NO
NO
...

user output
NO
NO
NO
NO
NO
...