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40 lines
776 B
C++
40 lines
776 B
C++
#include <iostream>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 3e5 + 5;
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int n, m, k;
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long long now, ans, a[N], b[N], c[N], sum[N];
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bool tag[N];
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int main() {
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std::ios::sync_with_stdio(false);
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cin >> n >> m >> k;
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for (int i = 1; i <= m; i++) {
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cin >> b[i];
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tag[b[i]] = true;
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}
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for (int i = 1; i <= n; i++) {
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cin >> a[i];
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a[i] %= k;
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sum[i] = (sum[i - 1] + a[i]) % k;
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}
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for (int i = 1; i <= m; i++) {
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c[sum[b[i]]]++;
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}
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ans = c[0];
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for (int i = 1; i <= n; i++) {
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if (tag[i]) c[sum[i]]--;
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ans = std::max(ans, now + c[a[i]]);
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if (!sum[i] && tag[i]) now++;
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ans = std::max(ans, now);
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}
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cout << ans << endl;
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return 0;
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}
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