func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long N = 2e5 + 5;   long long read() {     long long s = 0;     char c = getchar(), lc =  + ;     while (c <  0  ||  9  < c) lc = c, c = getchar();     while ( 0  <= c && c <=  9 ) s = s * 10 + c -  0 , c = getchar();     return lc ==  -  ? -s : s;   }   void write(long long x) {     if (x < 0) putchar( - ), x = -x;     if (x < 10)       putchar(x +  0 );     else       write(x / 10), putchar(x % 10 +  0 );   }   void print(long long x, char c =   n ) {     write(x);     putchar(c);   }   long long a[N], n, q;   struct node {     long long sum, len, tag;     node() { tag = -1; }     void update(long long x) {       tag = x;       sum = len * x;     }   } t[N * 4];   node operator+(const node &a, const node &b) {     node ret;     ret.sum = a.sum + b.sum;     ret.len = a.len + b.len;     return ret;   }   void push_down(long long w) {     if (!~t[w].tag) return;     t[(w * 2)].update(t[w].tag);     t[(w * 2 + 1)].update(t[w].tag);     t[w].tag = -1;   }   void cover(long long w, long long l, long long r, long long ql, long long qr,              long long x) {     if (r < ql || qr < l) return;     if (ql <= l && r <= qr) return t[w].update(x);     if (l < r) push_down(w);     cover((w * 2), l, ((l + r) / 2), ql, qr, x);     cover((w * 2 + 1), ((l + r) / 2) + 1, r, ql, qr, x);     t[w] = t[(w * 2)] + t[(w * 2 + 1)];   }   long long query(long long w, long long l, long long r, long long ql,                   long long qr) {     if (r < ql || qr < l) return 0;     if (ql <= l && r <= qr) return t[w].sum;     if (l < r) push_down(w);     return query((w * 2), l, ((l + r) / 2), ql, qr) +            query((w * 2 + 1), ((l + r) / 2) + 1, r, ql, qr);   }   void build(long long w, long long l, long long r) {     if (l == r) {       t[w].len = 1;       t[w].sum = 0;       return;     }     build((w * 2), l, ((l + r) / 2));     build((w * 2 + 1), ((l + r) / 2) + 1, r);     t[w] = t[(w * 2)] + t[(w * 2 + 1)];   }   set<long long> d;   void insert(long long x) {     if (d.find(x) != d.end()) return;     auto r = d.lower_bound(x);     cover(1, 1, n, (*--r) + 1, x, n - x);     d.insert(x);   }   void erase(long long x) {     if (d.find(x) == d.end()) return;     auto p = d.find(x), l = p, r = p;     l--, r++;     cover(1, 1, n, (*l) + 1, x, n - (*r));     d.erase(p);   }   inline long long calc(long long l, long long r) {     return (l + r) * (r - l + 1) / 2;   }   signed main(signed bangumi, char *ss969[]) {     (void)bangumi, (void)ss969;     n = read(), q = read();     for (long long i = 1; i <= n; i++) a[i] = read();     build(1, 1, n);     d.insert(0), d.insert(n);     for (long long i = 1; i < n; i++)       if (a[i] > a[i + 1]) insert(i);     while (q--) {       long long opt = read(), x = read(), y = read();       if (opt == 1) {         a[x] = y;         if (x > 1) {           if (a[x - 1] <= a[x])             erase(x - 1);           else             insert(x - 1);         }         if (x < n) {           if (a[x] <= a[x + 1])             erase(x);           else             insert(x);         }       } else {         if (y == n) {           print(calc(n - y + 1, n - x + 1) - query(1, 1, n, x, y));           continue;         }         auto p = d.upper_bound(y);         long long tmp = max(*--p, x - 1);         print(calc(n - y + 1, n - x + 1) - query(1, 1, n, x, tmp) -               (y - tmp) * (n - y));       }     }     return 0;   }   