func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 500005;   const int maxx = 1000005;   int n, x, y, q, l, r;   int a[N];   struct Tree {     int ans, m, tag;   } tr[maxx * 6];   void pushdown(int rt) {     int lson = rt << 1;     int rson = rt << 1 | 1;     tr[lson].m += tr[rt].tag;     tr[rson].m += tr[rt].tag;     tr[lson].tag += tr[rt].tag;     tr[rson].tag += tr[rt].tag;     tr[rt].tag = 0;   }   void updata(int rt) {     int lson = rt << 1;     int rson = rt << 1 | 1;     if (tr[lson].m == tr[rson].m) {       tr[rt].m = tr[lson].m;       tr[rt].ans = tr[lson].ans + tr[rson].ans;     } else if (tr[lson].m < tr[rson].m) {       tr[rt].m = tr[lson].m;       tr[rt].ans = tr[lson].ans;     } else {       tr[rt].m = tr[rson].m;       tr[rt].ans = tr[rson].ans;     }   }   void change(int rt, int l, int r, int cl, int cr, int C) {     if (cl <= l && r <= cr) {       tr[rt].m += C;       tr[rt].tag += C;       return;     }     pushdown(rt);     int mid = (l + r) >> 1;     if (cl <= mid) change(rt << 1, l, mid, cl, cr, C);     if (cr > mid) change(rt << 1 | 1, mid + 1, r, cl, cr, C);     updata(rt);   }   void change2(int rt, int l, int r, int x, int C) {     if (l == r) {       tr[rt].ans += C;       return;     }     pushdown(rt);     int mid = (l + r) >> 1;     if (x <= mid) change2(rt << 1, l, mid, x, C);     if (x > mid) change2(rt << 1 | 1, mid + 1, r, x, C);     updata(rt);   }   int query(int rt, int l, int r, int ql, int qr) {     if (ql <= l && r <= qr) {       if (tr[rt].m == 1) return tr[rt].ans;       return 0;     }     pushdown(rt);     int mid = (l + r) >> 1, summ = 0;     if (ql <= mid) summ += query(rt << 1, l, mid, ql, qr);     if (qr > mid) summ += query(rt << 1 | 1, mid + 1, r, ql, qr);     updata(rt);     return summ;   }   int main() {     scanf( %d %d , &n, &q);     for (int i = 1; i <= n; ++i) scanf( %d , &a[i]);     a[0] = maxx;     a[n + 1] = 0;     for (int i = 1; i <= n; ++i) change2(1, 0, maxx, a[i], 1);     for (int i = 1; i <= n + 1; ++i) {       int l = a[i - 1];       int r = a[i];       if (l == r) continue;       if (l > r) swap(l, r);       change(1, 0, maxx, l, r - 1, 1);     }     for (int i = 1; i <= q; ++i) {       scanf( %d %d , &x, &y);       l = a[x];       r = a[x + 1];       if (l != r) {         if (l > r) swap(l, r);         change(1, 0, maxx, l, r - 1, -1);       }       l = a[x - 1];       r = a[x];       if (l != r) {         if (l > r) swap(l, r);         change(1, 0, maxx, l, r - 1, -1);       }       change2(1, 0, maxx, a[x], -1);       change2(1, 0, maxx, y, 1);       a[x] = y;       l = a[x];       r = a[x + 1];       if (l != r) {         if (l > r) swap(l, r);         change(1, 0, maxx, l, r - 1, 1);       }       l = a[x - 1];       r = a[x];       if (l != r) {         if (l > r) swap(l, r);         change(1, 0, maxx, l, r - 1, 1);       }       printf( %d n , query(1, 0, maxx, 1, maxx - 1));     }     return 0;   }   