Submission #876575

#	Time	Username	Problem	Language	Result	Execution time	Memory
876575		vjudge1	Intergalactic ship (IZhO19_xorsum)	C++17	0 / 100	1558 ms	12464 KiB

xorsum

// https://oj.uz/problem/view/IZhO19_xorsum

#include <bits/stdc++.h>
using namespace std;

int32_t main() {
        ios_base::sync_with_stdio(0);
        cin.tie(0);
        const int MOD = 1e9 + 7;
        int n;
        cin >> n;
        vector<int> A(n);
        for (int i = 0; i < n; i++) cin >> A[i];
        int q;
        cin >> q;
        vector<int> l(q), r(q), x(q);
        for (int i = 0; i < q; i++) cin >> l[i] >> r[i] >> x[i], l[i]--;
        int64_t p = 1;
        int64_t res = 0;
        for (int i = 0; i < q; i++) (p *= 2) %= MOD;
        for (int i = 0; i < 7; i++) {
                for (int j = 0; j < 7; j++) {
                        vector<vector<int>> cntl(n + 1, vector<int>(n + 1));
                        vector<vector<int>> cntr(n + 1, vector<int>(n + 1));
                        vector<vector<int>> cntb(n + 1, vector<int>(n + 1));
                        for (int z = 0; z < q; z++) {
                                int a = x[z] >> i & 1, b = x[z] >> j & 1;
                                if (a && b) {
                                        cntb[l[z]][l[z]]++;
                                        cntb[l[z]][r[z]]--;
                                        cntb[r[z]][l[z]]--;
                                        cntb[r[z]][r[z]]++;
                                }
                                if (a) {
                                        cntl[l[z]][r[z]]++;
                                        cntl[l[z]][n + 1]--;
                                        cntl[r[z]][r[z]]--;
                                        cntl[r[z]][n + 1]--;
                                }
                                if (b) {
                                        cntr[0][l[z]]++;
                                        cntr[0][r[z]]--;
                                        cntr[l[z]][l[z]]--;
                                        cntr[l[z]][r[z]]++;
                                }
                        }
                        for (int i = 0; i <= n; i++) {
                                for (int j = 0; j < n; j++) {
                                        cntl[i][j + 1] += cntl[i][j];
                                        cntr[i][j + 1] += cntr[i][j];
                                        cntb[i][j + 1] += cntb[i][j];
                                }
                        }
                        for (int j = 0; j <= n; j++) {
                                for (int i = 0; i < n; i++) {
                                        cntl[i + 1][j] += cntl[i][j];
                                        cntr[i + 1][j] += cntr[i][j];
                                        cntb[i + 1][j] += cntb[i][j];
                                }
                        }

                        auto prod = [&](int a, int b) -> int64_t {
                                if (a == 0 && b == 1) return 0;
                                if (a == 0 && b == 0) return 2;
                                return 1;
                        };

                        for (int x = 0; x < n; x++) {
                                for (int y = x; y < n; y++) {
                                        int64_t add = (1ll << (i + j)) * (x + 1) * (n - y) * (1 + (x != y));
                                        add %= MOD;
                                        int a = A[x] >> i & 1;
                                        int b = A[y] >> j & 1;
                                        for (int z = 0; z < 8; z++) {
                                                if (((a ^ z ^ (z >> 1)) & 1) && ((b ^ z ^ (z >> 2)) & 1)) {
                                                        res += add * p % MOD * prod(cntb[x][y], z & 1) * prod(cntl[x][y], z >> 1 & 1) * prod(cntr[x][y], z >> 2 & 1);
                                                        res %= MOD;
                                                }
                                        }
                                }
                        }
                }
        }
        res *= MOD + 1 >> 1;
        res %= MOD;
        res *= MOD + 1 >> 1;
        res %= MOD;
        res *= MOD + 1 >> 1;
        res %= MOD;

        cout << res;
}

Compilation message (stderr)

xorsum.cpp: In function 'int32_t main()':
xorsum.cpp:84:20: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   84 |         res *= MOD + 1 >> 1;
      |                ~~~~^~~
xorsum.cpp:86:20: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   86 |         res *= MOD + 1 >> 1;
      |                ~~~~^~~
xorsum.cpp:88:20: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   88 |         res *= MOD + 1 >> 1;
      |                ~~~~^~~

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