Submission #1221809

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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()

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 unsigned long long ull;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<int, pii> P;

const ll INF = 1ll<<29;
const ll MOD = 1000000007;
const double EPS  = 1e-10;

int main() {
	int n;
	int a[112345];
	
	cin >> n;
	REP(i, n) scanf("%d", a + i);
	
	int ans = 1;
	int f = -1;
	
	REP(i, n - 1) {
		if (f == -1) {
			if (a[i] == a[i + 1]) f = 2;
			else f = a[i] < a[i + 1];
		}
		
		if (a[i] > a[i + 1]) {
			if (f == 2) {
				f = 0;
			}
			if (f == 1) {
				f = -1;
				ans++;
			}
		}
		
		if (a[i] < a[i + 1]) {
			if (f == 2) {
				f = 1;
			}
			if (f == 0) {
				f = -1;
				ans++;
			}
		}
	}
	
	cout << ans << 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