Submission #891801
Source Code Expand
/* {{{ Shinobu kawaii */
/*
______ __ _ __
.' ____ \ [ | (_) [ |
| (___ \_| | |--. __ _ .--. .--. | |.--. __ _
_.____`. | .-. | [ | [ `.-. |/ .'`\ \| '/'`\ \[ | | |
| \____) | | | | | | | | | | || \__. || \__/ | | \_/ |,
\______.'[___]|__][___][___||__]'.__.'[__;.__.' '.__.'_/
*/
/* }}} */
#include <bits/stdc++.h>
using namespace std;
// #define int long long
struct Fast {Fast(){std::cin.tie(0);ios::sync_with_stdio(false);}} fast;
/* cpp template {{{ */
/* short */
#define pb push_back
#define mp make_pair
#define Fi first
#define Se second
#define ALL(v) (v).begin(), (v).end()
#define X real()
#define Y imag()
/* REPmacro */
#define REPS(i, a, n) for (int i = (a); i < (n); ++i)
#define REP(i, n) REPS(i, 0, n)
#define RREP(i, n) REPS(i, 1, n + 1)
#define DEPS(i, a, n) for (int i = (a); i >= n; --i)
#define DEP(i, n) DEPS(i, n, 0)
/* debug */
#define debug(x) cerr << x << " " << "(L:" << __LINE__ << ")" << '\n';
/* typedef */
typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> vi;
typedef vector<vi> vii;
typedef vector<vii> viii;
typedef pair<int, int> pii;
typedef double D;
typedef complex<D> P;
/* const */
const int INF = 1001001001;
const ll LINF = 1001001001001001001ll;
const int MOD = 1e9 + 7;
const D EPS = 1e-9;
const int dx[] = {0, 1, 0, -1, 1, -1, 1, -1}, dy[] = {1, 0, -1, 0, 1, -1, -1, 1};
/* func */
inline bool inside(int y, int x, int H, int W) {return y >= 0 && x >= 0 && y < H && x < W;}
inline int in() {int x; std::cin >> x; return x;}
template <typename T> void print(T x) {std::cout << x << '\n';}
template <typename T>
void print(std::vector<T>& v, std::string s = " ") {
REP(i, v.size()) {
if (i != 0) std::cout << s;
std::cout << v[i];
}
std::cout << '\n';
}
/* }}} */
signed main()
{
int n = in();
vi a(n); REP(i, n) a[i] = in() - 1;
map<pii, int> chie;
REP(i, n) {
chie[mp(min(i, a[i]), max(i, a[i]))]++;
}
int ans = 0;
for (auto v : chie) {
if (v.Se == 2) ans++;
}
print(ans);
return 0;
}
Submission Info
Submission Time |
|
Task |
B - Friendly Rabbits |
User |
kurokoji |
Language |
C++14 (GCC 5.4.1) |
Score |
200 |
Code Size |
2213 Byte |
Status |
AC |
Exec Time |
42 ms |
Memory |
6912 KB |
Judge Result
Set Name |
Sample |
All |
Score / Max Score |
0 / 0 |
200 / 200 |
Status |
|
|
Set Name |
Test Cases |
Sample |
0_00.txt, 0_01.txt, 0_02.txt |
All |
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 |
Case Name |
Status |
Exec Time |
Memory |
0_00.txt |
AC |
3 ms |
256 KB |
0_01.txt |
AC |
3 ms |
256 KB |
0_02.txt |
AC |
3 ms |
256 KB |
1_00.txt |
AC |
3 ms |
256 KB |
1_01.txt |
AC |
42 ms |
3840 KB |
1_02.txt |
AC |
39 ms |
6912 KB |
1_03.txt |
AC |
40 ms |
6528 KB |
1_04.txt |
AC |
40 ms |
6912 KB |
1_05.txt |
AC |
40 ms |
6912 KB |
1_06.txt |
AC |
40 ms |
6912 KB |
1_07.txt |
AC |
40 ms |
6912 KB |
1_08.txt |
AC |
16 ms |
2816 KB |
1_09.txt |
AC |
32 ms |
5760 KB |
1_10.txt |
AC |
27 ms |
4864 KB |
1_11.txt |
AC |
8 ms |
1408 KB |