Submission #342618

#	Time	Username	Problem	Language	Result	Execution time	Memory
342618		Olerinskiy	Intergalactic ship (IZhO19_xorsum)	C++14	17 / 100	2071 ms	548 KiB

xorsum

#include <iostream>
#include <iomanip>
#include <algorithm>
#include <bitset>
#include <set>
#include <unordered_set>
#include <map>
#include <unordered_map>
#include <cmath>
#include <time.h>
#include <random>
#include <string>
#include <cassert> 
#include <vector>
#include <ostream>
#include <istream>
#include <stack>
#include <deque>
#include <queue>
#include <functional>
#include <chrono>
#include <stack>

using namespace std;

#define int long long
#define pb push_back
#define all(a) (a).begin(), (a).end()
#define pii pair<int, int>
#define ld long double

istream& operator>> (istream& in, pii& b) {
    in >> b.first >> b.second;
    return in;
}

ostream& operator<< (ostream& out, const pii& b) {
    out << "{" << b.first << ", " << b.second << "}";
    return out;
}

template<typename T> ostream& operator<< (ostream& out, const vector<T>& a) {
    for (auto k : a) out << k << " ";
    return out;
}

template <typename T1, typename T2> inline bool chkmin(T1 &x, const T2 &y) {if (x > y) {x = y; return 1;} return 0;}
template <typename T1, typename T2> inline bool chkmax(T1 &x, const T2 &y) {if (x < y) {x = y; return 1;} return 0;}

#ifdef LOCAL
    #define dbg(x) cout << #x << " : " << (x) << endl;
    const long long INF = 1e18;
    // const long long mod = 2600000069;
    // const long long p = 10;
#else
    #define dbg(x) 57
    const long long INF = 1e18;
    // const long long mod = 2600000069;  
    // const long long p = 179;
#endif

const ld PI = 4 * atan(1);

#define time clock() / (double) CLOCKS_PER_SEC

// #pragma GCC optimize("Ofast,no-stack-protector")
// #pragma GCC target("sse,sse2,sse3,sse3,sse4")
// #pragma GCC optimize("unroll-loops")
// #pragma GCC optimize("fast-math")
// #pragma GCC target("avx2")  
// #pragma GCC optimize("section-anchors")
// #pragma GCC optimize("profile-values,profile-reorder-functions,tracer")
// #pragma GCC optimize("vpt")
// #pragma GCC optimize("rename-registers")
// #pragma GCC optimize("move-loop-invariants")
// #pragma GCC optimize("unswitch-loops")
// #pragma GCC optimize("function-sections")
// #pragma GCC optimize("data-sections")

mt19937 gen(chrono::high_resolution_clock::now().time_since_epoch().count());

const int N = 1010;
const int mod = 1e9 + 7;

int n, q;
int a[N];
int l[N], r[N], x[N];
int b[N], pref[N], suf[N];

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    cin >> q;
    for (int i = 0; i < q; i++) {
        cin >> l[i] >> r[i] >> x[i];
        l[i]--, r[i]--;
    }
    int ans = 0;
    for (int i = 0; i < (1 << q); i++) {
        for (int j = 0; j < n; j++) {
            b[j] = 0;
        }
        for (int j = 0; j < q; j++) {
            if ((i >> j) & 1) {
                b[l[j]] ^= x[j];
                b[r[j] + 1] ^= x[j];
            }
        }
        int curx = 0;
        for (int i = 0; i < n; i++) {
            curx ^= b[i];
            a[i] ^= curx;
        }
        for (int i = 0; i < n; i++) {
            int sum = 0;
            for (int j = i; j < n; j++) {
                sum += a[j];
                ans += sum * sum % mod;
                if (ans >= mod) ans -= mod;
            }
        }
        // pref[0] = a[0];
        // for (int i = 1; i < n; i++) {
        //     pref[i] = pref[i - 1] + a[i] * (i + 1);
        //     if (pref[i] >= mod) pref[i] -= mod;
        // }
        // suf[n - 1] = a[n - 1];
        // for (int i = n - 2; i >= 0; i--) {
        //     suf[i] = suf[i + 1] + a[i] * (n - i);
        //     if (suf[i] >= mod) suf[i] -= mod;
        // }
        // for (int i = 0; i < n - 1; i++) {
        //     ans += 2ll * pref[i] * suf[i + 1] % mod;
        //     if (ans >= mod) ans -= mod;
        //     ans += a[i] * (i + 1) * (n - i) % mod;
        //     if (ans >= mod) ans -= mod;
        // }
        curx = 0;
        for (int i = 0; i < n; i++) {
            curx ^= b[i];
            a[i] ^= curx;
        }
    }
    cout << ans << "\n";
}
/*

*/

• Subtask 1: 4 / 4
• Subtask 2: 5 / 5
• Subtask 3: 0 / 6
• Subtask 4: 0 / 9
• Subtask 5: 8 / 8
• Subtask 6: 0 / 11
• Subtask 7: 0 / 19
• Subtask 8: 0 / 30
• Subtask 9: 0 / 8