Submission #1380558

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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 main() {
	int N, a[112345];
	cin >> N;
	REP(i, N) scanf("%d", a + i);
	
	ll ans = 0;
	REP(i, N) {
		if (a[i] > 2) {
			int now;
			if (a[i] & 1) now = (a[i] - 1) / 2;
			else now = (a[i] - 2) / 2;
			ans += now;
			a[i] -= now * 2;
		}
	}
	
	int pos = 0;
	while (pos < N) {
		if (a[pos] == 2) ans++;
		if (a[pos] == 1) {
			int cnt = 1;
			pos++;
			while (pos < N && a[pos] == 2) pos++, cnt++;
			if (pos == N) cnt--;
			else if (a[pos] != 2) cnt--;
			ans += cnt;
		}
		pos++;
	}
	
	cout << ans << endl;
	
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:25:30: 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