#include <bits/stdc++.h>
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rnd(int l,int r)
{
return l+rng()%(r-l+1);
}
#define fasty ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define forinc(x,a,b) for(int x=a;x<=b;x++)
#define fordec(x,a,b) for(int x=a;x>=b;x--)
#define iii pair<ii,int>
#define fi first
#define se second
#define ii pair<int,int>
#define getbit(x,i) ((x>>(i))&1)
#define batbit(x,i) (x|(1ll<<(i)))
#define tatbit(x,i) (x&~(1<<(i)))
#define endl '\n'
#define pb push_back
#define int long long
const int N = 1e6 + 10;
int n, t[N];
int f[N][23];
int lg[N];
int dp[N];
int get(int l, int r)
{
int p = lg[r-l+1];
return max(f[l][p] , f[r - (1<<p) + 1][p]);
}
int cost(int j, int i)
{
return dp[j] + get(j+1,i)*(n-j);
}
int inc=1;
int dec=1;
main()
{
//freopen("task.inp" , "r" , stdin);
fasty;
cin >> n;
forinc(i,1,n)
{
cin >> t[i];
f[i][0] = t[i];
}
forinc(i,1,n-1)
{
if(t[i] > t[i+1]) inc=0;
if(t[i] < t[i+1]) dec=0;
}
forinc(i,2,n) lg[i] = lg[i/2] + 1;
forinc(j,1,20)
{
for(int i=1 ; i + (1<<j) - 1 <= n ; i++)
{
f[i][j] = max(f[i][j-1] , f[i + (1<<(j-1) )][j-1]);
}
}
if(n<=7000)
{
memset(dp , 127, sizeof dp);
dp[0]=0;
forinc(i,1,n)
{
fordec(j,i-1,0) dp[i] = min(dp[i] ,cost(j,i));
}
cout << dp[n];
return 0;
}
if(dec == 1)
{
int sum=0;
int res = a[1] * n;
cout << res << "\n";
return 0;
}
}
Compilation message
Discharging.cpp:37:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
37 | main()
| ^~~~
Discharging.cpp: In function 'int main()':
Discharging.cpp:50:27: error: reference to 'dec' is ambiguous
50 | if(t[i] < t[i+1]) dec=0;
| ^~~
In file included from /usr/include/c++/10/ios:42,
from /usr/include/c++/10/istream:38,
from /usr/include/c++/10/sstream:38,
from /usr/include/c++/10/complex:45,
from /usr/include/c++/10/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54,
from Discharging.cpp:1:
/usr/include/c++/10/bits/ios_base.h:1023:3: note: candidates are: 'std::ios_base& std::dec(std::ios_base&)'
1023 | dec(ios_base& __base)
| ^~~
Discharging.cpp:36:5: note: 'long long int dec'
36 | int dec=1;
| ^~~
Discharging.cpp:71:8: error: reference to 'dec' is ambiguous
71 | if(dec == 1)
| ^~~
In file included from /usr/include/c++/10/ios:42,
from /usr/include/c++/10/istream:38,
from /usr/include/c++/10/sstream:38,
from /usr/include/c++/10/complex:45,
from /usr/include/c++/10/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54,
from Discharging.cpp:1:
/usr/include/c++/10/bits/ios_base.h:1023:3: note: candidates are: 'std::ios_base& std::dec(std::ios_base&)'
1023 | dec(ios_base& __base)
| ^~~
Discharging.cpp:36:5: note: 'long long int dec'
36 | int dec=1;
| ^~~
Discharging.cpp:74:19: error: 'a' was not declared in this scope
74 | int res = a[1] * n;
| ^
Discharging.cpp:73:13: warning: unused variable 'sum' [-Wunused-variable]
73 | int sum=0;
| ^~~
