#include <bits/stdc++.h>
//#define scan(x) scanf("%d",&x);
//#define scan2(x,y) scanf("%d%d",&x,&y);
//#define rg register int
#define lowbit(x) x&(-x)
using namespace std;
typedef long long ll;
const ll mod = 1e9 + 7;
const ll INF = 1e18;
const int M = 1e4 + 6;const int maxn = 6e5 + 10;struct BIT {ll n, c[maxn];inline void init(ll _n_) {n = _n_;memset(c, 0, sizeof(c));}inline void modify(int pos, ll val) {while (pos <= n) {c[pos] += val;pos += lowbit(pos);}}inline ll query(int pos) {ll res = 0;while (pos) {res += c[pos];pos -= lowbit(pos);}return res;}
} bit;int n, x, height[maxn];
int dp[maxn];int main() {
#ifndef ONLINE_JUDGEfreopen("splay.txt", "r", stdin);
#endifscanf("%d%d", &n, &x);for (register int i = 1; i <= n; ++i) {scanf("%d", &height[i]);dp[i] = dp[i - 1];dp[i] += (height[i] >= x);}ll res = 0;bit.init(6 * n + 8);bit.modify(n + 1, 1);for (register int i = 1; i <= n; ++i) {res += bit.query(2 * dp[i] - i + n + 1);bit.modify(2 * dp[i] - i + n + 1, 1);}printf("%lld\n", res);return 0;
}

The map of the region in which FJ lives consists of N intersections (2 <= N <= 10,000) and M directional roads (1 <= M <= 50,000).  Road i connects intersections A_i (1 <= A_i <= N) and B_i (1 <= B_i <= N).  Multiple roads could connect the same pair of intersections, and a bi-directional road (one permitting two-way travel) is represented by two separate directional roads in opposite orientations.  FJ's house is located at intersection 1, and his farm is located at intersection N.  It is possible to reach the farm from his house by traveling along a series of directional roads.

Both GPS units are using the same underlying map as described above; however, they have different notions for the travel time along each road.  Road i takes P_i units of time to traverse according to the first GPS unit, and Q_i units of time to traverse according to the second unit (each travel time is an integer in the range 1..100,000).

FJ wants to travel from his house to the farm.  However, each GPS unit complains loudly any time FJ follows a road (say, from intersection X to intersection Y) that the GPS unit believes not to be part of a shortest route from X to the farm (it is even possible that both GPS units can complain, if FJ takes a road that neither unit likes).

Please help FJ determine the minimum possible number of total complaints he can receive if he chooses his route appropriately.  If both GPS units complain when FJ follows a road, this counts as +2 towards the total.

There are 5 intersections and 7 directional roads.  The first road connects from intersection 3 to intersection 4; the first GPS thinks this road takes  7 units of time to traverse, and the second GPS thinks it takes 1 unit of time, etc.

If FJ follows the path 1 -> 2 -> 4 -> 5, then the first GPS complains on the 1 -> 2 road (it would prefer the 1 -> 3 road instead).  However, for the rest of the route 2 -> 4 -> 5, both GPSs are happy, since this is a shortest route from 2 to 5 according to each GPS.

#include <bits/stdc++.h>
//#define scan(x) scanf("%d",&x);
//#define scan2(x,y) scanf("%d%d",&x,&y);
//#define rg register int
#define lowbit(x) x&(-x)
using namespace std;
typedef long long ll;
const ll mod = 1e9 + 7;
const ll INF = 1e18;
const int M = 1e4 + 6;const int maxn = 1e5 + 10;struct GPS_1 {int to, nx;ll val;
} f[maxn];struct GPS_2 {int to, nx;ll val;
} s[maxn];struct event {int to, nx;ll val;
} o[maxn];int n, m;
ll dis1[M], dis2[M], dis[maxn];int tot1, tot2, tot, head1[maxn], head2[maxn], head[maxn];
int vis[maxn];inline void add_edge1(int u, int v, ll w) {f[++tot1].to = v;f[tot1].val = w;f[tot1].nx = head1[u];head1[u] = tot1;
}inline void add_edge2(int u, int v, ll w) {s[++tot2].to = v;s[tot2].val = w;s[tot2].nx = head2[u];head2[u] = tot2;
}inline void add_edge(int u, int v, ll w) {o[++tot].to = v;o[tot].val = w;o[tot].nx = head[u];head[u] = tot;
}inline void spfa1() {for (register int i = 1; i <= n; ++i)dis1[i] = INT_MAX / 2;queue<int> q;q.push(n);dis1[n] = 0;while (!q.empty()) {int cur = q.front();q.pop();vis[cur] = 0;for (register int i = head1[cur]; i; i = f[i].nx) {int to = f[i].to;if (dis1[to] > dis1[cur] + f[i].val) {dis1[to] = dis1[cur] + f[i].val;if (!vis[to]) {q.push(to);vis[to] = 1;}}}}
}inline void spfa2() {for (register int i = 1; i <= n; ++i)dis2[i] = INT_MAX / 2, vis[i] = 0;queue<int> q;q.push(n);dis2[n] = 0;while (!q.empty()) {int cur = q.front();q.pop();vis[cur] = 0;for (register int i = head2[cur]; i; i = s[i].nx) {int to = s[i].to;if (dis2[to] > dis2[cur] + s[i].val) {dis2[to] = dis2[cur] + s[i].val;if (!vis[to]) {q.push(to);vis[to] = 1;}}}}
}inline void spfa() {for (register int i = 1; i <= n; ++i)dis[i] = INT_MAX / 2, vis[i] = 0;queue<int> q;q.push(1);dis[1] = 0;while (!q.empty()) {int cur = q.front();q.pop();vis[cur] = 0;for (register int i = head[cur]; i; i = o[i].nx) {int to = o[i].to;if (dis[to] > dis[cur] + o[i].val) {dis[to] = dis[cur] + o[i].val;if (!vis[to]) {q.push(to);vis[to] = 1;}}}}
}int main() {
#ifndef ONLINE_JUDGEfreopen("splay.txt", "r", stdin);
#endifscanf("%d%d", &n, &m);ll p,q;for (register int i = 1, a, b; i <= m; ++i) {scanf("%d%d%lld%lld", &a, &b, &p, &q);add_edge1(b, a, p);add_edge2(b, a, q);}spfa1();spfa2();//printf("debug dis1[1] = %lld dis[2] = %lld\n", dis1[1], dis2[1]);for (register int i = 1; i <= n; ++i) {for (register int j = head1[i]; j; j = f[j].nx) {int to = f[j].to;int init = 2;if (dis1[to] == dis1[i] + f[j].val)--init;if (dis2[to] == dis2[i] + s[j].val)--init;add_edge(to, i, init);}}spfa();printf("%lld\n", dis[n]);return 0;
}