#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define in ({int x=0;int c=getchar(),n=0;for(;!isdigit(c);c=getchar()) n=(c=='-');for(;isdigit(c);c=getchar()) x=x*10+c-'0';n?-x:x;})
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 fori(x,a,b) for(int x=a;x<=b;x++)
#define ford(x,a,b) for(int x=a;x>=b;x--)
#define forv(a,b) for(auto&a:b)
#define fi first
#define se second
#define pb push_back
#define ii pair<int,int>
#define mt make_tuple
#define all(a) a.begin(),a.end()
#define reset(f,x) memset(f,x,sizeof(f))
#define getbit(x,i) ((x>>i)&1)
#define batbit(x,i) (x|(1ll<<i))
#define tatbit(x,i) (x&~(1<<i))
#define gg exit(0);
const int N = 2e5 + 10;
int l[N],r[N],s[4*N],a[N],b[N],n;
void build(int x,int l,int r)
{
if(l==r)
{
s[x] = b[l];
return;
}
int mid = (l+r)/2;
build(2*x,l,mid);build(2*x+1,mid+1,r);
s[x] = min(s[2*x],s[2*x+1]);
}
int get(int x,int l,int r,int u,int v)
{
if(l==u&&r==v) return s[x];
int mid = (l+r)/2;
if(v<=mid) return get(2*x,l,mid,u,v);
else if(u>=mid+1) return get(2*x+1,mid+1,r,u,v);
return min(get(2*x,l,mid,u,mid),get(2*x+1,mid+1,r,mid+1,r));
}
main()
{
//freopen("task.inp","r",stdin);
fasty;
cin>>n;
fori(i,1,n) cin>>a[i]>>b[i];
build(1,1,n);
stack<int> st;
fori(i,1,n)
{
while(!st.empty() && a[st.top()]>=a[i]) st.pop();
if(st.empty()) l[i] = 0;
else l[i] = st.top();
st.push(i);
}
while(!st.empty()) st.pop();
ford(i,n,1)
{
while(!st.empty() && a[st.top()]>=a[i]) st.pop();
if(st.empty()) r[i] = n+1;
else r[i] = st.top();
st.push(i);
}
ll kq = 0;
fori(i,1,n)
{
int len = get(1,1,n,l[i]+1,r[i]-1);
kq=max(kq,1ll*(r[i]-l[i]-1)*1ll*len*1ll*a[i]);
}
cout<<kq;
}
//50
//usaco guide PLATINUM,oiwiki
//https://codeforces.com/blog/entry/92130
/* Weak:
- Lien Thong Manh(https://codeforces.com/blog/entry/68138,1534F1,1027F,usaco)
- Constructive(https://assets.hkoi.org/training2018/ca.pdf,https://codeforces.com/blog/entry/69575?)
- Flow
- Geometry(cses (Errichto),Line sweep) (MPOLY,CVXPOLY,MTRIAREA)
- HLD(https://codeforces.com/blog/entry/81317,Negativez2(E.Tourist))
*/
Compilation message
histogram.cpp:45:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
45 | main()
| ^~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
332 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
332 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
