Submission #2252384


Source Code Expand

#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <fstream>
#include <sstream>
#include <set>
#include <map>
#include <vector>
#include <list>
#include <algorithm>
#include <cstring>
#include <cmath>
#include <string>
#include <queue>
#include <bitset>     //UWAGA - w czasie kompilacji musi byc znany rozmiar wektora - nie mozna go zmienic
#include <cassert>
#include <iomanip>        //do setprecision
#include <ctime>
#include <complex>
using namespace std;

#define FOR(i,b,e) for(int i=(b);i<(e);++i)
#define FORQ(i,b,e) for(int i=(b);i<=(e);++i)
#define FORD(i,b,e) for(int i=(b)-1;i>=(e);--i)
#define REP(x, n) for(int x = 0; x < (n); ++x)

#define ST first
#define ND second
#define PB push_back
#define MP make_pair
#define LL long long
#define ULL unsigned LL
#define LD long double

const double pi = 3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342;
const int mod=1000000007;

int main(){
	int n,a[101010]={};
	cin>>n;
	FORQ(i,1,n){
		cin>>a[i];
	}
	int c=0;
	FORQ(i,2,n){
		if(a[i]==i&&a[i-1]==i-1){
			swap(a[i],a[i-1]);
			c++;
		}
	}
	if(a[1]==1){
		swap(a[1],a[2]);
		c++;
	}
	FORQ(i,2,n){
		if(a[i]==i){
			swap(a[i],a[i-1]);
			c++;
		}
	}
	cout<<c<<endl;
    return 0;
}

Submission Info

Submission Time
Task D - Derangement
User kt_tenel
Language C++14 (GCC 5.4.1)
Score 400
Code Size 1317 Byte
Status AC
Exec Time 37 ms
Memory 640 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 400 / 400
Status
AC × 4
AC × 15
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
Case Name Status Exec Time Memory
0_000.txt AC 1 ms 640 KB
0_001.txt AC 1 ms 640 KB
0_002.txt AC 3 ms 640 KB
0_003.txt AC 1 ms 640 KB
1_004.txt AC 1 ms 640 KB
1_005.txt AC 37 ms 640 KB
1_006.txt AC 36 ms 640 KB
1_007.txt AC 35 ms 640 KB
1_008.txt AC 36 ms 640 KB
1_009.txt AC 35 ms 640 KB
1_010.txt AC 35 ms 640 KB
1_011.txt AC 37 ms 640 KB
1_012.txt AC 36 ms 640 KB
1_013.txt AC 37 ms 640 KB
1_014.txt AC 36 ms 640 KB