Submission #1680116

---

Source Code Expand

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

using namespace std;

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

int a[N];
bool had[N];

int main(){	
	int n;
	LL ans = 0;

	scanf("%d", &n);
	For(i, 1, n){
		scanf("%d", &a[i]);
		
		if(a[i] >= 2) had[i] = true;
		ans += a[i] >> 1; a[i] = a[i] & 1;
	}
	
	int lst = -1;

	For(i, 1, n){
		if(!a[i] && lst == -1) continue;

		if(a[i] && lst == -1){
			lst = i; continue;
		}

		if(lst != -1 && !a[i]){
			if(!had[i]) lst = -1;
			continue;
		}

		++ans; lst = -1;
	}

	printf("%lld\n", ans);

	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:24:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
                 ^
./Main.cpp:26:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a[i]);
                     ^

Judge Result