Submission #1380811

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Source Code Expand

#include <bits/stdc++.h>

using namespace std;

#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
#define fi first
#define se second

template<typename A, typename B> inline bool chmax(A &a, B b) { if (a<b) { a=b; return 1; } return 0; }
template<typename A, typename B> inline bool chmin(A &a, B b) { if (a>b) { a=b; return 1; } return 0; }

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<int, pll> P;
const ll INF = 1ll<<30;
const ll MOD = 1000000007;
const double EPS  = 1e-10;

int N;
int a[112345];

int main() {
	cin >> N;
	REP(i, N) scanf("%d", a + i);
	
	vector<int> cx;
	REP(i, N) cx.push_back(a[i]);
	sort(ALL(cx));
	REP(i, N) a[i] = lower_bound(ALL(cx), a[i]) - cx.begin();
	
	int even = 0, odd = 0;
	
	REP(i, N) {
		if (i & 1 && a[i] & 1 == 0) odd++;
		if (i & 1 == 0 && a[i] & 1) even++;
	}
	
	cout << abs(even - odd) << endl;
	
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:27:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  REP(i, N) scanf("%d", a + i);
                              ^

Judge Result