Submission #4015966


Source Code Expand

#include <bits/stdc++.h>
#define MAX_N 100000
using namespace std;
template <class T> inline void read(T &x) {
	x = 0; int c = getchar(), f = 1;
	for (; !isdigit(c); c = getchar()) if (c == 45) f = -1;
	for (; isdigit(c); c = getchar()) (x *= 10) += f*(c-'0');
}
int n, m, a[MAX_N+5], fa[MAX_N+5];
int getf(int x) {return fa[x] == x ? x : fa[x] = getf(fa[x]);}
int main() {
	read(n), read(m);
	for (int i = 1; i <= n; i++) fa[i] = i;
	for (int i = 1; i <= n; i++) read(a[i]);
	for (int i = 1; i <= m; i++) {
		int u, v; read(u), read(v);
		u = getf(u), v = getf(v);
		if (u ^ v) fa[u] = v;
	}
	int tot = 0;
	for (int i = 1; i <= n; i++)
		tot += getf(i) == getf(a[i]);
	return printf("%d\n", tot), 0;
}

Submission Info

Submission Time
Task D - Equals
User Azrael_Death
Language C++14 (GCC 5.4.1)
Score 400
Code Size 727 Byte
Status AC
Exec Time 20 ms
Memory 1024 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 400 / 400
Status
AC × 4
AC × 23
Set Name Test Cases
Sample 0_000.txt, 0_001.txt, 0_002.txt, 0_003.txt
All 0_000.txt, 0_001.txt, 0_002.txt, 0_003.txt, 1_004.txt, 1_005.txt, 1_006.txt, 1_007.txt, 1_008.txt, 1_009.txt, 1_010.txt, 1_011.txt, 1_012.txt, 1_013.txt, 1_014.txt, 1_015.txt, 1_016.txt, 1_017.txt, 1_018.txt, 1_019.txt, 1_020.txt, 1_021.txt, 1_022.txt
Case Name Status Exec Time Memory
0_000.txt AC 1 ms 256 KB
0_001.txt AC 1 ms 256 KB
0_002.txt AC 1 ms 256 KB
0_003.txt AC 1 ms 256 KB
1_004.txt AC 8 ms 256 KB
1_005.txt AC 16 ms 1024 KB
1_006.txt AC 18 ms 1024 KB
1_007.txt AC 1 ms 256 KB
1_008.txt AC 1 ms 256 KB
1_009.txt AC 1 ms 256 KB
1_010.txt AC 1 ms 256 KB
1_011.txt AC 1 ms 256 KB
1_012.txt AC 1 ms 256 KB
1_013.txt AC 1 ms 256 KB
1_014.txt AC 2 ms 256 KB
1_015.txt AC 1 ms 256 KB
1_016.txt AC 1 ms 256 KB
1_017.txt AC 1 ms 256 KB
1_018.txt AC 7 ms 256 KB
1_019.txt AC 6 ms 1024 KB
1_020.txt AC 6 ms 1024 KB
1_021.txt AC 7 ms 1024 KB
1_022.txt AC 20 ms 1024 KB