CODE FESTIVAL 2016 qual A

Submission #1227902

Source codeソースコード

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

#define pb push_back
#define mp make_pair
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef complex<double> point;
#define xx real()
#define yy imag()

#define REP(i, a, b) for(int i = (a); i < (int)(b); i++)
#define REPN(i, a, b) for(int i = (a); i <= (int)(b); i++)
#define FA(it, x) for(__typeof((x).begin()) it = (x).begin(); it != (x).end(); it++)
#define SZ(x) (int)(x).size()
#define BE(x) (x).begin(), (x).end()
#define SORT(x) sort(BE(x))
#define _1 first
#define _2 second

#define x1 gray_cat_x1
#define y1 gray_cat_y1

template<class T> T gcd(T a, T b) { return b ? gcd(b, a % b) : a; }

#define file "cycle"

const double EPS = 1e-9;
const double PI = acos(-1.);
const int INF = 1e9;
const ll MOD = 1e9 + 7;

const int MAXN = 1e5 + 5;

int p[MAXN];

void solve(){
	int n;
	scanf("%d", &n);
	REPN(i, 1, n){
		scanf("%d", &p[i]);
	}
	int ans = 0;
	REPN(i, 1, n){
		if (p[p[i]] == i){
			ans++;
		}
	}
	ans /= 2;
	printf("%d\n", ans);
}	

int main(){

	//freopen(file".in", "r", stdin); freopen(file".out", "w", stdout);
	int t = 1;
	//cin >> t;
	while(t--){
		solve();	
	}
}

Submission

Task問題 B - 仲良しうさぎ / Friendly Rabbits
User nameユーザ名 Timur Sitdikov
Created time投稿日時
Language言語 C++14 (GCC 5.4.1)
Status状態 AC
Score得点 200
Source lengthソースコード長 1225 Byte
File nameファイル名
Exec time実行時間 11 ms
Memory usageメモリ使用量 640 KB

Compiler messageコンパイルメッセージ

./Main.cpp: In function ‘void solve()’:
./Main.cpp:40:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%d", &n);
^
./Main.cpp:42:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%d", &p[i]);
^

Test case

Set

Set name Score得点 / Max score Cases
Sample - 0_00.txt,0_01.txt,0_02.txt
All 200 / 200 0_00.txt,0_01.txt,0_02.txt,1_00.txt,1_01.txt,1_02.txt,1_03.txt,1_04.txt,1_05.txt,1_06.txt,1_07.txt,1_08.txt,1_09.txt,1_10.txt,1_11.txt

Test case

Case name Status状態 Exec time実行時間 Memory usageメモリ使用量
0_00.txt AC 1 ms 256 KB
0_01.txt AC 1 ms 256 KB
0_02.txt AC 1 ms 256 KB
1_00.txt AC 1 ms 256 KB
1_01.txt AC 10 ms 640 KB
1_02.txt AC 10 ms 640 KB
1_03.txt AC 10 ms 640 KB
1_04.txt AC 10 ms 640 KB
1_05.txt AC 10 ms 640 KB
1_06.txt AC 11 ms 640 KB
1_07.txt AC 10 ms 640 KB
1_08.txt AC 5 ms 384 KB
1_09.txt AC 9 ms 512 KB
1_10.txt AC 8 ms 512 KB
1_11.txt AC 3 ms 256 KB