Submission #1680261

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Source Code Expand

//2017-10-13
//miaomiao
//
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <iostream>
#include <algorithm>

using namespace std;

#define For(i, a, b) for(int i = (a); i <= (int)(b); ++i)
#define N (100000+5)

int ra[N], a[N];

int main(){
	int n;
	scanf("%d", &n);
	For(i, 1, n) scanf("%d", &ra[i]), a[i] = ra[i];
	
	int ans = 0;

	sort(ra+1, ra+n+1);
	For(i, 1, n){
		a[i] = lower_bound(ra+1, ra+n+1, a[i]) - ra;
		if((i&1) ^ (a[i]&1)) ++ans;
	}

//	printf("ans = %d\n", ans);
	printf("%d\n", ans >> 1);
	
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:20:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
                 ^
./Main.cpp:21:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  For(i, 1, n) scanf("%d", &ra[i]), a[i] = ra[i];
                                                ^

Judge Result