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Submission #943198

# Submission time Handle Problem Language Result Execution time Memory
943198 2024-03-11T09:12:41 Z batsukh2006 Fancy Fence (CEOI20_fancyfence) C++17
73 / 100
 1000 ms 4596 KB 
#include<iostream>
#include<stdio.h>
#include<math.h>
#include<map>
#include<string>
#include<algorithm>
#include<vector>
#include<string.h>
#include<utility>
#include<set>
#include<cmath>
#include<queue>
#include<deque>
#include<functional>
#include<stack>
#include<limits.h>
#include<iomanip>
#include<unordered_map> 
 
using namespace std;
 
#define MOD 1000000007
#define int long long
#define endl '\n'
int cal(int a, int b){
    int f=(a*(a+1))%MOD*((MOD+1)/2)%MOD;
    int s=(b*(b+1))%MOD*((MOD+1)/2)%MOD;
    return (f*s)%MOD;
}
void solve(){
    int n; cin>>n;
    vector<int> h(n+1),w(n+1);
    for(int i=1; i<=n; i++) cin>>h[i];
    for(int i=1; i<=n; i++) cin>>w[i];
    if(n<=1000){
        int ans=0;
        for(int i=1; i<=n; i++){
            int cur=0,mx=h[i];
            ans=(ans+cal(h[i],w[i]))%MOD;
            for(int j=i-1; j>=1; j--){
                mx=min(mx,h[j]);
                cur=(cur+w[j])%MOD;
                ans=(ans-cal(cur,mx)+MOD)%MOD;
                ans=(ans+cal((cur+w[i])%MOD,mx))%MOD;
                ans=(ans+cal((cur-w[j])%MOD,mx))%MOD;
                ans=(ans-cal((w[i]+(cur-w[j])%MOD)%MOD,mx)+MOD)%MOD;
            }
        }
        cout<<ans;
    }else{
        bool war=0;
        for(int i=1; i<n; i++){
            if(h[i]>h[i+1]) war=1;
        }
        if(war==0){
            vector<int> dw(n+2);
            for(int i=n; i>=1; i--) dw[i]=(dw[i+1]+w[i])%MOD;
            stack<int> f;
            f.push(n+1);
            int ans=0;
            for(int i=n; i>=1; i--){
                int pos=i+1;
                while(f.size()>1&&h[f.top()]>=h[i]){
                    f.pop();
                    ans=(ans-cal(dw[pos]-dw[f.top()],h[i])+MOD)%MOD;
                    pos=f.top();
                }
                ans=(ans+cal(dw[i]-dw[f.top()],h[i]))%MOD;
                f.push(i);
            }
            cout<<ans;
        }else{
            int mx=0;
            int ans=0;
            for(int i=1; i<=n; i++) mx=max(mx,h[i]);
            for(int i=1; i<=mx; i++){
                int cur=0;
                for(int j=1; j<=n; j++){
                    if(h[j]>=i) cur=(cur+w[j])%MOD;
                    else{
                        ans=(ans+cal(cur,i))%MOD;
                        ans=(ans-cal(cur,i-1)+MOD)%MOD;
                        cur=0;
                    }
                }
                ans=(ans+cal(cur,i))%MOD;
                ans=(ans-cal(cur,i-1)+MOD)%MOD;
            }
            cout<<ans;
        }
    }
}
signed main(){
	// freopen("hps.in", "r", stdin);
	// freopen("hps.out", "w", stdout);
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	
	int t=1;
	// cin>>t;
	while(t--){
		solve();
		cout<<endl;
	}
	return 0;
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 16 ms 476 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 16 ms 344 KB Output is correct
3 Correct 7 ms 1116 KB Output is correct
4 Correct 14 ms 3024 KB Output is correct
5 Correct 15 ms 3416 KB Output is correct
6 Correct 13 ms 3160 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 348 KB Output is correct
2 Correct 3 ms 612 KB Output is correct
3 Correct 11 ms 1624 KB Output is correct
4 Correct 18 ms 2652 KB Output is correct
5 Correct 22 ms 2652 KB Output is correct
6 Correct 0 ms 344 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 18 ms 348 KB Output is correct
3 Correct 2 ms 604 KB Output is correct
4 Correct 9 ms 1628 KB Output is correct
5 Correct 18 ms 2652 KB Output is correct
6 Correct 18 ms 2652 KB Output is correct
7 Correct 16 ms 348 KB Output is correct
8 Correct 2 ms 604 KB Output is correct
9 Correct 9 ms 1504 KB Output is correct
10 Correct 18 ms 2652 KB Output is correct
11 Correct 18 ms 2652 KB Output is correct
12 Correct 1 ms 348 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 16 ms 464 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 16 ms 472 KB Output is correct
9 Correct 16 ms 348 KB Output is correct
10 Correct 16 ms 476 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 4 ms 348 KB Output is correct
13 Correct 16 ms 472 KB Output is correct
14 Correct 16 ms 348 KB Output is correct
15 Correct 16 ms 596 KB Output is correct
16 Correct 0 ms 348 KB Output is correct

Subtask #7
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 16 ms 476 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 18 ms 472 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 16 ms 472 KB Output is correct
11 Correct 8 ms 1116 KB Output is correct
12 Correct 13 ms 3276 KB Output is correct
13 Correct 14 ms 3164 KB Output is correct
14 Correct 13 ms 3164 KB Output is correct
15 Correct 16 ms 488 KB Output is correct
16 Correct 2 ms 860 KB Output is correct
17 Correct 10 ms 2396 KB Output is correct
18 Correct 19 ms 4596 KB Output is correct
19 Correct 20 ms 4516 KB Output is correct
20 Correct 16 ms 344 KB Output is correct
21 Correct 2 ms 860 KB Output is correct
22 Correct 10 ms 2396 KB Output is correct
23 Correct 18 ms 4436 KB Output is correct
24 Correct 24 ms 4444 KB Output is correct
25 Correct 1 ms 600 KB Output is correct
26 Correct 4 ms 348 KB Output is correct
27 Correct 16 ms 468 KB Output is correct
28 Correct 16 ms 492 KB Output is correct
29 Correct 16 ms 348 KB Output is correct
30 Execution timed out 1034 ms 856 KB Time limit exceeded
31 Halted 0 ms 0 KB -