Submission #1520118

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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, pii> pip;
const ll INF = 1ll<<29;
const ll MOD = 1000000007;
const double EPS  = 1e-10;
const bool debug = 0;
//----------------------//

int n;
int a[1123456];

int main() {
	cin >> n;
	REP(i, 1<<n) scanf("%d", a + i);
	
	REP(i, n) {
		for (int j = 0; j < 1<<n; j += 1<<i+1) {
			int nex = j + (1<<i);
			
			if (a[j] == a[nex]) continue;
			a[j] = max(a[nex], a[j]) - min(a[nex], a[j]);
		}
	}
	
	cout << a[0] << endl;
	
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:25:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  REP(i, 1<<n) scanf("%d", a + i);
                                 ^

Judge Result