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Submission #894455

# Submission time Handle Problem Language Result Execution time Memory
894455 2023-12-28T09:55:01 Z Dec0Dedd Fancy Fence (CEOI20_fancyfence) C++14
42 / 100
 61 ms 5924 KB 
#include <bits/stdc++.h>

using namespace std;

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

const int N = 1e5+10;
const int MOD = 1e9+7;

ll h[N], w[N], pw[N], dp[N], n;

void solve() {
    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; ++i) pw[i]=pw[i-1]+w[i];
    dp[0]=0, h[0]=0;

    ll ans=0; // dp[i] -> from {1, 2, ..., i} ends on rightmost point of i
    stack<int> st; st.push(0);

    for (int i=1; i<=n; ++i) {
        while (h[st.top()] > h[i]) st.pop();
        (ans+=dp[st.top()]*w[i])%=MOD;
        ll hl=(h[i]*(h[i]+1)/2)%MOD, wl=(w[i]*(w[i]+1)/2)%MOD;
        (dp[i]+=dp[st.top()]+(pw[i]-pw[st.top()])*hl)%=MOD;
        (ans+=((w[i]*(pw[i-1]-pw[st.top()]))%MOD)*hl)%=MOD;
        (ans+=wl*hl)%=MOD;
        st.push(i);
    }

    /*
    cout<<"dp: ";
    for (int i=1; i<=n; ++i) cout<<dp[i]<<" ";
    cout<<"\n";
    */

    assert(ans >= 0 && ans < MOD);
    cout<<ans<<"\n";
}

int main() {
    int t=1; //cin>>t;
    while (t--) solve();
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Incorrect 1 ms 2648 KB Output isn't correct
3 Halted 0 ms 0 KB -

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 1 ms 2492 KB Output is correct
4 Correct 1 ms 2392 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct

Subtask #3
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2504 KB Output is correct
3 Correct 21 ms 3752 KB Output is correct
4 Correct 41 ms 5000 KB Output is correct
5 Correct 41 ms 4692 KB Output is correct
6 Incorrect 41 ms 4692 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 6 ms 2880 KB Output is correct
3 Correct 34 ms 4192 KB Output is correct
4 Correct 57 ms 5800 KB Output is correct
5 Correct 59 ms 5820 KB Output is correct
6 Correct 1 ms 2396 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 9 ms 2652 KB Output is correct
4 Correct 29 ms 4160 KB Output is correct
5 Correct 61 ms 5716 KB Output is correct
6 Correct 61 ms 5924 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 7 ms 2884 KB Output is correct
9 Correct 29 ms 4212 KB Output is correct
10 Correct 55 ms 5712 KB Output is correct
11 Correct 57 ms 5800 KB Output is correct
12 Correct 1 ms 2696 KB Output is correct

Subtask #6
0 / 18.0

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

Subtask #7
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Incorrect 1 ms 2648 KB Output isn't correct
3 Halted 0 ms 0 KB -