//#include <horses.h>
#pragma GCC optimize("-O3")
#include<bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
#define ll long long
#define ld long double
#define vl vector<ll>
#define vi vector<int>
#define pii pair<int, int>
#define pll pair<ll, ll>
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define pb push_back
#define p_b pop_back
#define f first
#define s second
using namespace std;
using namespace __gnu_pbds;
typedef tree<int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;
const ll sz = 5e5+5, mod = 1e9+7;
ll a[sz], b[sz], segtree[4*sz], segtree2[4*sz], n;
void build(ll v, ll l, ll r)
{
if(l == r)
{
segtree[v] = a[l];
return;
}
else
{
ll mid = (l + r) / 2;
build(2*v, l, mid);
build(2*v+1, mid+1, r);
segtree[v] = segtree[2*v] * segtree[2*v+1];
if(segtree[v] >= mod)
segtree[v] -= mod;
}
}
void update(ll v, ll l, ll r, ll idx, ll val)
{
if(l == r)
segtree[v] = val;
else
{
ll mid = (l + r) / 2;
if(idx <= mid)
update(2*v, l, mid, idx, val);
else
update(2*v+1, mid+1, r, idx, val);
segtree[v] = segtree[2*v] * segtree[2*v+1];
if(segtree[v] >= mod)
segtree[v] -= mod;
}
}
ll findans(ll v, ll l, ll r, ll tl, ll tr)
{
if(tl > tr)
return 1;
if(l == tl && r == tr)
return segtree[v];
else
{
ll mid = (l + r) / 2;
ll lans = findans(2*v, l, mid, tl, min(mid, tr));
ll rans = findans(2*v+1, mid+1, r, max(mid+1, tl), tr);
ll f = lans * rans;
if(f >= mod)
f -= mod;
return f;
}
}
void build2(ll v, ll l, ll r)
{
if(l == r){
segtree2[v] = findans(1, 1, n, 1, l) * b[l];
if(segtree2[v] >= mod)
segtree2[v] -= mod;
return;
}
ll mid = (l + r) / 2;
build2(2*v, l, mid);
build2(2*v+1, mid+1, r);
segtree2[v] = max(segtree2[2*v], segtree2[2*v+1]);
}
void update2(ll v, ll l, ll r, ll idx, ll val)
{
if(l == r)
{
segtree2[v] = findans(1, 1, n, 1, l) * val;
if(segtree2[v] >= mod)
segtree2[v] -= mod;
return;
}
else
{
ll mid = (l + r) / 2;
if(idx <= mid)
update2(2*v, l, mid, idx, val);
else
update2(2*v+1, mid+1, r, idx, val);
segtree2[v] = max(segtree2[2*v], segtree2[2*v+1]);
}
}
ll findans2(ll v, ll l, ll r, ll tl, ll tr)
{
if(tl > tr)
return LLONG_MIN;
if(l == tl && r == tr)
return segtree2[v];
else
{
ll mid = (l + r) / 2;
ll lans = findans2(2*v, l, mid, tl, min(mid, tr));
ll rans = findans2(2*v+1, mid+1, r, max(mid+1, tl), tr);
return max(lans, rans);
}
}
ll init(ll N, ll X[], ll Y[]) {
n = N;
for(ll i = 1; i <= n; i++)
{
a[i] = X[i-1];
b[i] = Y[i-1];
}
build(1, 1, n);
build2(1, 1, n);
return findans2(1, 1, n, 1, n) % mod;
}
ll updateX(ll pos, ll val) {
pos++;
update(1, 1, n, pos, val);
return findans(1, 1, n, 1, n);
}
ll updateY(ll pos, ll val) {
pos++;
update2(1, 1, n, pos, val);
return findans2(1, 1, n, 1, n);
}
Compilation message
/usr/bin/ld: /tmp/ccaU6htw.o: in function `main':
grader.c:(.text.startup+0xaa): undefined reference to `init(int, int*, int*)'
/usr/bin/ld: grader.c:(.text.startup+0x113): undefined reference to `updateX(int, int)'
/usr/bin/ld: grader.c:(.text.startup+0x16d): undefined reference to `updateY(int, int)'
collect2: error: ld returned 1 exit status
