func_code_string: #include <bits/stdc++.h>   using namespace std;   namespace Fread {   const int MAXN = 1 << 20;   char buffer[MAXN], *S, *T;   inline char getchar() {     if (S == T) {       T = (S = buffer) + fread(buffer, 1, MAXN, stdin);       if (S == T) return EOF;     }     return *S++;   }   }  // namespace Fread   inline int read() {     int f = 1, x = 0;     char ch = Fread::getchar();     while (!isdigit(ch)) {       if (ch ==  - ) f = -1;       ch = Fread::getchar();     }     while (isdigit(ch)) {       x = x * 10 + ch -  0 ;       ch = Fread::getchar();     }     return x * f;   }   inline long long readll() {     long long f = 1, x = 0;     char ch = Fread::getchar();     while (!isdigit(ch)) {       if (ch ==  - ) f = -1;       ch = Fread::getchar();     }     while (isdigit(ch)) {       x = x * 10 + ch -  0 ;       ch = Fread::getchar();     }     return x * f;   }   const int MAXN = 1e6 + 10, N = 1e6 + 1, INF = 0x3f3f3f3f;   int n, q, a[MAXN];   struct SegmentTree {     int val[MAXN << 2], cnt[MAXN << 2], tag[MAXN << 2];     void push_down(int p) {       if (tag[p]) {         val[p << 1] += tag[p];         tag[p << 1] += tag[p];         val[p << 1 | 1] += tag[p];         tag[p << 1 | 1] += tag[p];         tag[p] = 0;       }     }     void push_up(int p) {       if (val[p << 1] == val[p << 1 | 1]) {         val[p] = val[p << 1];         cnt[p] = cnt[p << 1] + cnt[p << 1 | 1];       } else if (val[p << 1] < val[p << 1 | 1]) {         val[p] = val[p << 1];         cnt[p] = cnt[p << 1];       } else {         val[p] = val[p << 1 | 1];         cnt[p] = cnt[p << 1 | 1];       }     }     void modify1(int p, int l, int r, int ql, int qr, int x) {       if (ql <= l && qr >= r) {         tag[p] += x;         val[p] += x;         return;       }       push_down(p);       int mid = (l + r) >> 1;       if (ql <= mid) modify1(p << 1, l, mid, ql, qr, x);       if (qr > mid) modify1(p << 1 | 1, mid + 1, r, ql, qr, x);       push_up(p);     }     void modify2(int p, int l, int r, int pos, int x) {       if (l == r) {         cnt[p] += x;         assert(cnt[p] < 2);         return;       }       push_down(p);       int mid = (l + r) >> 1;       if (pos <= mid)         modify2(p << 1, l, mid, pos, x);       else         modify2(p << 1 | 1, mid + 1, r, pos, x);       push_up(p);     }     int query(int p, int l, int r, int ql, int qr) {       if (ql <= l && qr >= r) return val[p] == 1 ? cnt[p] : 0;       int mid = (l + r) >> 1, res = 0;       if (ql <= mid) res = query(p << 1, l, mid, ql, qr);       if (qr > mid) res += query(p << 1 | 1, mid + 1, r, ql, qr);       return res;     }     SegmentTree() {}   } T;   int main() {     n = read();     q = read();     for (int i = 1; i <= n; ++i) a[i] = read();     a[0] = N;     a[n + 1] = 0;     for (int i = 0; i <= n; ++i) {       if (a[i] != a[i + 1])         T.modify1(1, 0, N, min(a[i], a[i + 1]) + 1, max(a[i], a[i + 1]), 1);       if (i) T.modify2(1, 0, N, a[i], 1);     }     while (q--) {       int i = read(), x = read();       T.modify2(1, 0, N, a[i], -1);       if (a[i] != a[i - 1]) {         T.modify1(1, 0, N, min(a[i], a[i - 1]) + 1, max(a[i], a[i - 1]), -1);       }       if (a[i] != a[i + 1]) {         T.modify1(1, 0, N, min(a[i], a[i + 1]) + 1, max(a[i], a[i + 1]), -1);       }       a[i] = x;       if (a[i] != a[i - 1]) {         T.modify1(1, 0, N, min(a[i], a[i - 1]) + 1, max(a[i], a[i - 1]), 1);       }       if (a[i] != a[i + 1]) {         T.modify1(1, 0, N, min(a[i], a[i + 1]) + 1, max(a[i], a[i + 1]), 1);       }       T.modify2(1, 0, N, a[i], 1);       printf( %d n , T.query(1, 0, N, 1, N - 1));     }     return 0;   }   