Submission #344212

#	Time	Username	Problem	Language	Result	Execution time	Memory
344212		Nurlykhan	Intergalactic ship (IZhO19_xorsum)	C++17	0 / 100	2077 ms	1516 KiB

xorsum

#include <bits/stdc++.h>

using namespace std;

const int N = (int)1e5 + 10;
const int M = 256;
const int mod = (int)1e9 + 7;

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

int dp[M + M], old_dp[M + M];

int get_sum(int id) {
    memset(old_dp, 0, sizeof(old_dp));

    old_dp[a[id]] = 1;
    for (int i = 0; i < q; i++) {
        if (l[i] <= id && id <= r[i]) {
            memset(dp, 0, sizeof(dp));
            for (int j = 0; j < M; j++) {
                (dp[j ^ x[i]] += old_dp[j]) %= mod;
            }
            for (int j = 0; j < M; j++) {
                (old_dp[j] += dp[j]) %= mod;
            }
        }
    }

    int ans = 0;
    for (int i = 0; i < M; i++) {
        (ans += i * 1ll * old_dp[i] % mod) %= mod;
    }
    return ans;
}

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 = 1; i <= n; i++) {
        //cout << i << ' ' << get_sum(i) << endl;
    }
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= n; j++) {
            //cout << i << ' ' << j << ' ' << get_sum(i) * 1ll * get_sum(j) * min(i, j) * min(n - i + 1, n - j + 1)
            (ans += get_sum(i) * 1ll * get_sum(j) * min(i, j) * min(n - i + 1, n - j + 1) % mod) %= mod;
        }
    }

    cout << ans;
    return 0;
}

Compilation message (stderr)

xorsum.cpp: In function 'int main()':
xorsum.cpp:39:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   39 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
xorsum.cpp:41:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   41 |         scanf("%d", &a[i]);
      |         ~~~~~^~~~~~~~~~~~~
xorsum.cpp:42:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   42 |     scanf("%d", &q);
      |     ~~~~~^~~~~~~~~~
xorsum.cpp:44:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   44 |         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