Submission #389269

#	Time	Username	Problem	Language	Result	Execution time	Memory
389269		2qbingxuan	XOR Sum (info1cup17_xorsum)	C++14	0 / 100	811 ms	4236 KiB

xorsum

#include <bits/stdc++.h>
#ifdef local
#define safe cerr<<__PRETTY_FUNCTION__<<" line "<<__LINE__<<" safe\n"
#define pary(a...) danb(#a, a)
#define debug(a...) qqbx(#a, a)
template <typename ...T> void qqbx(const char *s, T ...a) {
    int cnt = sizeof...(T);
    ((std::cerr << "\033[1;32m(" << s << ") = (") , ... , (std::cerr << a << (--cnt ? ", " : ")\033[0m\n")));
}
template <typename T> void danb(const char *s, T L, T R) {
    std::cerr << "\033[1;32m[ " << s << " ] = [ ";
    for (int f = 0; L != R; ++L)
        std::cerr << (f++ ? ", " : "") << *L;
    std::cerr << " ]\033[0m\n";
}
#else
#define debug(...) ((void)0)
#define safe ((void)0)
#define pary(...) ((void)0)
#endif // local
#define all(v) begin(v),end(v)
#define pb emplace_back
using namespace std;
const int maxn = 1000025, LGC = 29;

struct TREE : vector<int> {
    int less_equal(int x) {
        return upper_bound(begin(), end(), x) - begin();
    }
    int greater(int x) {
        return end() - upper_bound(begin(), end(), x);
    }
} pre[2];
int a[maxn];
signed main() {
    ios_base::sync_with_stdio(0), cin.tie(0);
    int n;
    cin >> n;
    for (int i = 0; i < n; i++)
        cin >> a[i];

    pre[0].reserve(n);
    pre[1].reserve(n);
    int ans = 0;
    for (int b = 0; b < LGC; b++) {
        int U = (1<<b) - 1;
        int parity = 0;
        pre[0].clear();
        pre[1].clear();
        sort(a, a+n, [U](int x, int y){ return (x & U) < (y & U); });
        continue;
        for (int i = 0; i < n; i++) {
            int d = a[i] >> b & 1;
            pre[d].push_back(a[i] & U);
            parity += pre[!d].less_equal(~a[i] & U);
            parity += pre[d].greater(~a[i] & U);
        }
        debug(parity);
        parity &= 1;
        ans |= parity << b;
    }
    cout << ans << '\n';
}

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