Submission #344188

#	Time	Username	Problem	Language	Result	Execution time	Memory
344188		Nurlykhan	Intergalactic ship (IZhO19_xorsum)	C++17	0 / 100	2072 ms	1900 KiB

xorsum

#include <bits/stdc++.h>

using namespace std;

const int N = (int)1e5 + 10;
const int mod = (int)1e9 + 7;

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

int main() {
    scanf("%d", &n);
    for (int i = 1; i <= n; i++)
        scanf("%d", &a[i]);
    scanf("%d", &q);
    for (int i = 0; i < q; i++)
        scanf("%d%d%d", &l[i], &r[i], &x[i]);

    int ans = 0;
    for (int i = 0; i < (1 << q); i++) {
        for (int j = 0; j < q; j++) {
            xr[j] = 0;
        }
        for (int j = 0; j < q; j++) {
            if ((i >> j) % 2) {
                xr[l[j]] ^= x[j];
                xr[r[j] + 1] ^= x[j];
            }
        }
        for (int i = 1; i <= n; i++) {
            xr[i] ^= xr[i - 1];
            b[i] = a[i] ^ xr[i];
        }
        for (int i = 1; i <= n; i++) {
            int s = 0;
            for (int j = i; j <= n; j++) {
                s += b[j];
                (ans += (s * 1ll * s) % mod) %= mod;
            }
        }
    }

    cout << ans;
    return 0;
}

Compilation message (stderr)

xorsum.cpp: In function 'int main()':
xorsum.cpp:13:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   13 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
xorsum.cpp:15:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   15 |         scanf("%d", &a[i]);
      |         ~~~~~^~~~~~~~~~~~~
xorsum.cpp:16:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   16 |     scanf("%d", &q);
      |     ~~~~~^~~~~~~~~~
xorsum.cpp:18:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   18 |         scanf("%d%d%d", &l[i], &r[i], &x[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• 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