Submission #844709

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Source Code Expand

#include "bits/stdc++.h"
using namespace std;
#define rep(i,n) for(int (i)=0;(i)<(int)(n);++(i))
#define rer(i,l,u) for(int (i)=(int)(l);(i)<=(int)(u);++(i))
#define reu(i,l,u) for(int (i)=(int)(l);(i)<(int)(u);++(i))
static const int INF = 0x3f3f3f3f; static const long long INFL = 0x3f3f3f3f3f3f3f3fLL;
typedef vector<int> vi; typedef pair<int, int> pii; typedef vector<pair<int, int> > vpii; typedef long long ll;
template<typename T, typename U> static void amin(T &x, U y) { if(y < x) x = y; }
template<typename T, typename U> static void amax(T &x, U y) { if(x < y) x = y; }

int main() {
	int N;
	while(~scanf("%d", &N)) {
		vector<int> A(N);
		for(int i = 0; i < N; ++ i)
			scanf("%d", &A[i]);
		vector<vector<ll>> dp(N + 1, vector<ll>(2, -1));
		dp[0][0] = 0;
		rep(i, N) rep(j, 2) {
			ll x = dp[i][j];
			if(x == -1) continue;
			rep(a, 2) rep(b, 2) {
				if(a + b > A[i]) continue;
				amax(dp[i + 1][b], x + (j + a) / 2 + (A[i] - a - b) / 2);
			}
		}
		ll ans = max(dp[N][0], dp[N][1]);
		printf("%lld\n", ans);
	}
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:16:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", &A[i]);
                      ^

Judge Result