Submission #890256
Source Code Expand
#include <cstdio> #include <cstdlib> #include <cstring> #include <iostream> #include <vector> #include <string> #include <algorithm> #include <stack> #include <queue> #include <set> #include <cmath> #include <map> using namespace std; #define MOD 1000000007 #define ADD(X,Y) ((X) = ((X) + (Y)%MOD) % MOD) typedef long long i64; typedef vector<int> ivec; typedef vector<string> svec; int N, A[101010]; int main() { scanf("%d", &N); for (int i = 0; i < N; ++i) { scanf("%d", A + i); --A[i]; } int ret = 0; for (int i = 0; i < N; ++i) { if (A[A[i]] == i) ++ret; } printf("%d\n", ret / 2); return 0; }
Submission Info
Submission Time | |
---|---|
Task | B - Friendly Rabbits |
User | semiexp |
Language | C++14 (GCC 5.4.1) |
Score | 200 |
Code Size | 647 Byte |
Status | AC |
Exec Time | 18 ms |
Memory | 768 KB |
Compile Error
./Main.cpp: In function ‘int main()’: ./Main.cpp:22:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ ./Main.cpp:24:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", A + i); ^
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 | 2 ms | 256 KB |
0_01.txt | AC | 2 ms | 256 KB |
0_02.txt | AC | 2 ms | 256 KB |
1_00.txt | AC | 2 ms | 256 KB |
1_01.txt | AC | 12 ms | 640 KB |
1_02.txt | AC | 12 ms | 640 KB |
1_03.txt | AC | 12 ms | 768 KB |
1_04.txt | AC | 12 ms | 640 KB |
1_05.txt | AC | 18 ms | 768 KB |
1_06.txt | AC | 12 ms | 640 KB |
1_07.txt | AC | 12 ms | 640 KB |
1_08.txt | AC | 6 ms | 384 KB |
1_09.txt | AC | 10 ms | 512 KB |
1_10.txt | AC | 9 ms | 640 KB |
1_11.txt | AC | 4 ms | 256 KB |