51 lines
1.2 KiB
C++
51 lines
1.2 KiB
C++
#include <set>
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#include <map>
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#include <queue>
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#include <deque>
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#include <cmath>
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#include <vector>
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#include <string>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include <cassert>
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#include <iostream>
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#include <algorithm>
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using namespace std;
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typedef long long LL;
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typedef pair <int, int> PII;
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const int N = 1e5 + 7;
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const int INF = 0x3f3f3f3f;
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const int MOD = 1e9 + 7;
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const double EPS = 1e-6;
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const double PI = acos(-1.0);
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int a[N];
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LL l[N], r[N];
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int main(void){
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int T;
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scanf("%d", &T);
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while (T--) {
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int n, p;
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scanf("%d%d", &n, &p);
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for (int i = 1; i <= n; ++i)
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scanf("%d", &a[i]);
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l[0] = r[0] = l[n + 1] = r[n + 1] = 0;
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for (int i = 1; i <= n; ++i)
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l[i] = max(l[i - 1] + a[i], (LL)a[i]);
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for (int i = n; i; --i)
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r[i] = max(r[i + 1] + a[i], (LL)a[i]);
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LL ans = -INF;
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for (int i = 1; i <= n; ++i) {
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ans = max(ans, max(l[i - 1], 0LL) + max(r[i + 1], 0LL) + p);
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}
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for (int i = 1; i < n; ++i) {
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ans = max(ans, l[i]);
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}
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for (int i = n; i > 1; --i) {
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ans = max(ans, r[i]);
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}
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printf("%I64d\n", ans);
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}
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return 0;
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}
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