제출 #433298

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
433298		hhhhaura	XOR Sum (info1cup17_xorsum)	C++14	0 / 100	182 ms	26292 KiB

xorsum

#define wiwihorz
#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#pragma loop-opt(on)

#define rep(i, a, b) for(int i = a; i <= b; i ++)
#define rrep(i, a, b) for(int i = b; i >= a; i--)
#define all(x) x.begin(), x.end()
#define ceil(a, b) ((a + b - 1) / (b))

#define INF 1000000000000000000
#define MOD 1000000007
#define eps (1e-9)

using namespace std;

#define int long long int
#define lld long double
#define pii pair<int, int>
#define random mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count())

#ifdef wiwihorz
#define print(a...) kout("[" + string(#a) + "] = ", a) 
void vprint(auto L, auto R) { while(L < R) cerr << *L << " \n"[next(L) == R], ++L;}
void kout() { cerr << endl; }
template<class T1, class ... T2> void kout(T1 a, T2 ... e) { cerr << a << " ", kout(e...); }
#else
#define print(...) 0
#define vprint(...) 0
#endif
// radix sort
// for every layer, find p1, p2, p3
namespace solver {
	int n, lg, ii;
	vector<int> a, L, R;
	void init_(int _n) {
		n = _n, lg = 4;
		a.assign(n + 1, 0);
	}
	int solve() {
		int ans = 0;
		rep(i, 0, lg) {
			L.clear(), R.clear(), ii = 0;
			rep(j, 1, n) {
				if((a[j] >> i) & 1) R.push_back(a[j]);
				else L.push_back(a[j]);
			}
			for(auto j : L) a[++ii] = j;
			for(auto j : R) a[++ii] = j;
			int p1 = n, p2 = n, p3 = n, mask = (1 << (i + 1)) - 1;
			int x = (1 << i), y = (1 << i) * 2, z = (1 << i) * 3;
			rep(j, 1, n) {
				int cur = a[j] & mask;
				while(p1 && cur + (a[p1] & mask) >= x) p1 --;
				while(p2 && cur + (a[p2] & mask) >= y) p2 --;
				while(p3 && cur + (a[p3] & mask) >= z) p3 --;
				if((n - p3 + p2 - p1) & 1) ans ^= (1 << i);
			} 
 		}
 		return ans;
	}
};
using namespace solver;
signed main() {
	ios::sync_with_stdio(false), cin.tie(0);
	int n; cin >> n; init_(n);
	rep(i, 1, n) cin >> a[i];
	cout << solve() << "\n";
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

xorsum.cpp:4: warning: ignoring '#pragma loop ' [-Wunknown-pragmas]
    4 | #pragma loop-opt(on)
      | 
xorsum.cpp:24:13: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   24 | void vprint(auto L, auto R) { while(L < R) cerr << *L << " \n"[next(L) == R], ++L;}
      |             ^~~~
xorsum.cpp:24:21: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   24 | void vprint(auto L, auto R) { while(L < R) cerr << *L << " \n"[next(L) == R], ++L;}
      |                     ^~~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 11
• Subtask 3: 0 / 21
• Subtask 4: 0 / 38
• Subtask 5: 0 / 23