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Submission #881387

# Submission time Handle Problem Language Result Execution time Memory
881387 2023-12-01T08:16:37 Z Alish Fancy Fence (CEOI20_fancyfence) C++17
100 / 100
 132 ms 13780 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long int	ll;
typedef pair<int, int>	pii;
typedef pair<ll, ll>	pll;


#define F		        first
#define S		        second
#define pb		        push_back
#define endl            '\n'
#define Mp		        make_pair
#define all(x)          x.begin(), x.end()
#define debug(x)        cerr << #x << " = " << x << endl;
#define fast_io         ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define file_io         freopen("connect.in" , "r" , stdin) ; freopen("connect.out" , "w" , stdout);


ll mod = 1e9+7;

ll power(ll a, ll b){

    ll ans=1;
    a%=mod;
    while(b){
        if(b&1) ans=ans*a%mod;
        b>>=1;
        a=a*a%mod;
    }
    return ans;

}


const int N = 1e5+23;
ll pref[N], L[N], R[N];
ll h[N];
ll H[N], W[N], w[N];
int n;


map<pll, int> vis;

ll C(ll n){
    n%=mod;
    return n*(n+1)%mod*power(2, mod-2)%mod;
}


int main()
{
    fast_io
    cin>>n;

    for (int i=1; i<=n; i++) cin>>h[i];
    for (int i=1; i<=n; i++) cin>>w[i];

    for (int i=1; i<=n+1; i++) pref[i]=pref[i-1]+w[i];


    vector<int> st;

    for (int i=1; i<=n; i++){
        while(!st.empty() && h[st.back()]>=h[i]) st.pop_back();
        if(!st.empty()) L[i]=st.back();
        st.pb(i);
    }
    st.clear();

    for (int i=n; i>0; i--){
        while(!st.empty() && h[st.back()]>=h[i]) st.pop_back();
        if(!st.empty()) R[i]=st.back();
        else R[i]=n+1;
        st.pb(i);
    }

    ll ans=0;
    for (int i=1; i<=n; i++){
        if(vis[{h[i], L[i]}]) continue;
        vis[{h[i], L[i]}]=1;
        ll tool=pref[R[i]-1]-pref[L[i]];
        ll r1=h[i]-max(h[R[i]], h[L[i]]);
        ll r2=max(h[R[i]], h[L[i]]);
        ans=(ans+(C(r1)%mod+ r1*r2%mod)%mod*C(tool)%mod)%mod;

    }

    cout<<ans<<endl;


}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2396 KB Output is correct
2 Correct 2 ms 2396 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2396 KB Output is correct
2 Correct 0 ms 2396 KB Output is correct
3 Correct 0 ms 2396 KB Output is correct
4 Correct 0 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 22 ms 6236 KB Output is correct
4 Correct 37 ms 7616 KB Output is correct
5 Correct 41 ms 8184 KB Output is correct
6 Correct 26 ms 7232 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 2 ms 2652 KB Output is correct
3 Correct 9 ms 5896 KB Output is correct
4 Correct 23 ms 6788 KB Output is correct
5 Correct 22 ms 6740 KB Output is correct
6 Correct 1 ms 2392 KB Output is correct

Subtask #5
15.0 / 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 Correct 2 ms 2652 KB Output is correct
4 Correct 9 ms 5768 KB Output is correct
5 Correct 19 ms 6724 KB Output is correct
6 Correct 18 ms 6736 KB Output is correct
7 Correct 2 ms 2396 KB Output is correct
8 Correct 13 ms 3412 KB Output is correct
9 Correct 29 ms 7252 KB Output is correct
10 Correct 109 ms 13764 KB Output is correct
11 Correct 110 ms 13780 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2396 KB Output is correct
2 Correct 2 ms 2396 KB Output is correct
3 Correct 1 ms 2516 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 2 ms 2396 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 1 ms 2648 KB Output is correct
13 Correct 2 ms 2396 KB Output is correct
14 Correct 2 ms 2396 KB Output is correct
15 Correct 2 ms 2396 KB Output is correct
16 Correct 1 ms 2392 KB Output is correct

Subtask #7
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2396 KB Output is correct
2 Correct 2 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 2 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2772 KB Output is correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 20 ms 6236 KB Output is correct
12 Correct 33 ms 7508 KB Output is correct
13 Correct 40 ms 7940 KB Output is correct
14 Correct 32 ms 7004 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 2 ms 2652 KB Output is correct
17 Correct 9 ms 5860 KB Output is correct
18 Correct 18 ms 6748 KB Output is correct
19 Correct 17 ms 6728 KB Output is correct
20 Correct 2 ms 2392 KB Output is correct
21 Correct 11 ms 3420 KB Output is correct
22 Correct 29 ms 7236 KB Output is correct
23 Correct 113 ms 13712 KB Output is correct
24 Correct 109 ms 13652 KB Output is correct
25 Correct 1 ms 2400 KB Output is correct
26 Correct 1 ms 2524 KB Output is correct
27 Correct 2 ms 2400 KB Output is correct
28 Correct 2 ms 2400 KB Output is correct
29 Correct 2 ms 2400 KB Output is correct
30 Correct 12 ms 3424 KB Output is correct
31 Correct 12 ms 3424 KB Output is correct
32 Correct 56 ms 8792 KB Output is correct
33 Correct 70 ms 8968 KB Output is correct
34 Correct 128 ms 13216 KB Output is correct
35 Correct 114 ms 12880 KB Output is correct
36 Correct 121 ms 13420 KB Output is correct
37 Correct 132 ms 13380 KB Output is correct
38 Correct 0 ms 2392 KB Output is correct
39 Correct 115 ms 12904 KB Output is correct
40 Correct 110 ms 13380 KB Output is correct
41 Correct 108 ms 13392 KB Output is correct
42 Correct 110 ms 13084 KB Output is correct