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Submission #946347

# Submission time Handle Problem Language Result Execution time Memory
946347 2024-03-14T14:10:23 Z Xiaoyang Fancy Fence (CEOI20_fancyfence) C++17
0 / 100
 4 ms 4764 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
 
#define fi first 
#define se second 
#define pll pair<ll,ll>
#define pb push_back
#define debug(x) cerr<<#x<<"="<<x<<endl;
#define MP make_pair
#define rep(i,a,b) for(ll i=a;i<b;i++)
#define SZ(x) (ll)x.size()
#define ALL(x) x.begin(),x.end()
#define endl "\n"
const ll inf=1e18;
ll lowbit(ll x){return x&(-x);}



const ll mod=1e9+7;
ll c2(ll x){
	return (x*(x-1)/2)%mod;
}
ll rect(ll x,ll y){
	ll xx=(x*(x+1)/2)%mod;
	ll yy=(y*(y+1)/2)%mod;
	return (xx*yy)%mod;
}

const ll maxn=1e5+5;
ll h[maxn],w[maxn],pre[maxn];

ll inc(ll &a,ll b){return a=(a+b)%mod;}
ll dec(ll &a,ll b){return a=(a-b+mod)%mod;}
int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	ll n;cin>>n;
	ll tot=0,ans=0;
	rep(i,1,n+1)cin>>h[i];
	rep(i,1,n+1){
		cin>>w[i],inc(tot,w[i]);
		pre[i]=pre[i-1]+w[i];
	}
	
	stack<pll>s;
	//monotonically increasing stack 
	s.push(MP(0ll,0ll));
	rep(i,1,n+1){
		while(!s.empty() and s.top().se>h[i])s.pop();
		ll len=(pre[i-1]-pre[s.top().se]+mod)%mod;
		inc(ans,(((c2(h[i]+1)*len)%mod)*w[i])%mod);
		inc(ans,(s.top().se*w[i])%mod);
		inc(ans,rect(h[i],w[i]));
		s.push(MP(i,(c2(h[i]+1)*(w[i]))%mod));
	}
	cout<<ans<<endl;
	return 0;
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2848 KB Output is correct
2 Runtime error 3 ms 4696 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 2396 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Incorrect 1 ms 2444 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Runtime error 4 ms 4700 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #5
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Runtime error 4 ms 4764 KB Execution killed with signal 11
4 Halted 0 ms 0 KB -

Subtask #6
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Runtime error 3 ms 4700 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #7
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2848 KB Output is correct
2 Runtime error 3 ms 4696 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -