func_code_string: #include <bits/stdc++.h>   using namespace std;   const int maxn = 200010;   int n, m, X, a[maxn], b[maxn], c[maxn], d[maxn], tr[maxn];   long long ans;   vector<int> M[maxn];   vector<pair<int, int>> Q[maxn];   void add(int p) {     for (; p <= X; p += p & -p) tr[p]++;   }   int sum(int p) {     int s = 0;     for (; p; p -= p & -p) s += tr[p];     return s;   }   int main() {     scanf( %d %d %d , &n, &m, &X);     for (int i = 1; i <= n; i++) {       scanf( %d , &a[i]), a[i] = min(a[i], X);     }     for (int i = 1; i <= m; i++) {       scanf( %d , &b[i]), b[i] = min(b[i], X);     }     auto init = [&](int n, int *a, int *c) {       static int mx[20][maxn], lb[maxn], rb[maxn];       for (int i = 1; i <= n; i++) {         mx[0][i] = a[i], lb[i] = rb[i] = 0;       }       for (int i = 1; i < 20; i++) {         for (int j = 1; j + (1 << i) - 1 <= n; j++) {           mx[i][j] = max(mx[i - 1][j], mx[i - 1][j + (1 << (i - 1))]);         }       }       auto query = [&](int l, int r) {         int k = log2(r - l + 1);         return max(mx[k][l], mx[k][r - (1 << k) + 1]);       };       stack<int> st;       for (int i = 1; i <= n; i++) {         while (!st.empty() && a[st.top()] > a[i]) rb[st.top()] = i, st.pop();         if (!st.empty()) lb[i] = st.top();         st.push(i);       }       for (int i = 1; i <= n; i++) {         c[i] = min(!lb[i] ? X : query(lb[i], i), !rb[i] ? X : query(i, rb[i]));       }     };     init(n, a, c), init(m, b, d);     for (int i = 1; i <= n; i++) {       Q[X - c[i]].emplace_back(a[i], -1);       Q[X - a[i]].emplace_back(a[i], 1);     }     for (int i = 1; i <= m; i++) {       M[b[i]].push_back(X - d[i] + 1);     }     for (int i = 0; i < X; i++) {       for (int d : M[i]) add(d);       for (auto p : Q[i]) ans += p.second * sum(p.first);     }     printf( %lld n , ans);     return 0;   }   