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Submission #749061

# Submission time Handle Problem Language Result Execution time Memory
749061 2023-05-27T09:40:39 Z bgnbvnbv Fancy Fence (CEOI20_fancyfence) C++14
100 / 100
 42 ms 9032 KB 
#include<bits/stdc++.h>
#define TASKNAME "codeforce"
#define pb push_back
#define pli pair<ll,ll>
#define fi first
#define se second
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL);
using namespace std;
using ll=long long;
const ll maxN=2e5;
const ll inf=1e18;
const ll mod=1e9+7;
ll get(ll l,ll r)
{
    if(r<l) return 0;
    ll sum=(r+l);
    ll cnt=(r-l+1);
    if(sum%2==0) sum/=2;
    else cnt/=2;
    sum%=mod;
    cnt%=mod;
    return sum*cnt%mod;
}
ll n,h[maxN];
deque<int> dq;
vector<pli>vec;
ll l[maxN],r[maxN],w[maxN],low[maxN],high[maxN];
void solve()
{
    cin >> n;
    for(int i=1;i<=n;i++) cin >> h[i];
    for(int i=1;i<=n;i++) cin >> w[i];
    ll last=0;
    for(int i=1;i<=n;i++)
    {
        low[i]=last+1;
        high[i]=last+w[i];
        last+=w[i];
    }
    low[n+1]=last+1;
    high[0]=0;
    for(int i=1;i<=n;i++)
    {
        while(!dq.empty()&&h[i]<=h[dq.back()]) dq.pop_back();
        if(dq.size()) l[i]=dq.back();
        else l[i]=0;
        vec.emplace_back(h[i],i);
        dq.pb(i);
    }
    dq.clear();
    ll ans=0;
    ll sum=0;
    for(int i=n;i>=1;i--)
    {
        while(!dq.empty()&&h[i]<h[dq.back()]) dq.pop_back();
        if(dq.size()) r[i]=dq.back();
        else r[i]=n+1;
        ans+=h[i]*((high[i]-high[l[i]])%mod)%mod*((low[r[i]]-high[i])%mod)%mod;
        ans+=h[i]*get(low[i],high[i]-1)%mod-h[i]*(high[l[i]]%mod)%mod*(w[i]-1)%mod;
        ans%=mod;
        if(ans<0) ans+=mod;
        sum+=((high[i]-high[l[i]])%mod)*((low[r[i]]-high[i])%mod)%mod;
        sum+=get(low[i],high[i]-1)-(high[l[i]]%mod)*(w[i]-1)%mod;
        sum%=mod;
        if(sum<0) sum+=mod;
        dq.pb(i);
    }
    ll vc=ans;
    sort(vec.begin(),vec.end());
    ll cur=0;
    for(int i=0;i<vec.size();i++)
    {
        ans+=(vec[i].first-cur)*vc%mod-get(1,vec[i].first-cur)*sum%mod;
        vc-=(vec[i].fi-cur)*sum%mod;
        ans=ans%mod;
        if(ans<0) ans+=mod;
        vc%=mod;
        if(vc<0) vc+=mod;
        ll x=vec[i].se;
        sum-=((high[x]-high[l[x]])%mod)*((low[r[x]]-high[x])%mod)%mod;
        sum-=get(low[x],high[x]-1)-high[l[x]]%mod*((high[x]-low[x])%mod)%mod;
        sum%=mod;
        if(sum<0) sum+=mod;
        cur=vec[i].fi;
    }
    cout << ans;
}
int main()
{
    fastio
    //freopen(TASKNAME".INP","r",stdin);
    //freopen(TASKNAME".OUT","w",stdout);
    solve();
}

Compilation message

fancyfence.cpp: In function 'void solve()':
fancyfence.cpp:71:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   71 |     for(int i=0;i<vec.size();i++)
      |                 ~^~~~~~~~~~~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 17 ms 3536 KB Output is correct
4 Correct 29 ms 6880 KB Output is correct
5 Correct 30 ms 6680 KB Output is correct
6 Correct 29 ms 6664 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 3 ms 1112 KB Output is correct
3 Correct 17 ms 3644 KB Output is correct
4 Correct 30 ms 7032 KB Output is correct
5 Correct 35 ms 7016 KB Output is correct
6 Correct 1 ms 340 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 3 ms 1112 KB Output is correct
4 Correct 15 ms 3664 KB Output is correct
5 Correct 32 ms 6980 KB Output is correct
6 Correct 33 ms 6912 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 3 ms 1272 KB Output is correct
9 Correct 18 ms 4636 KB Output is correct
10 Correct 31 ms 8792 KB Output is correct
11 Correct 30 ms 8932 KB Output is correct
12 Correct 0 ms 340 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 0 ms 340 KB Output is correct

Subtask #7
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 16 ms 4160 KB Output is correct
12 Correct 29 ms 8104 KB Output is correct
13 Correct 30 ms 7884 KB Output is correct
14 Correct 29 ms 7876 KB Output is correct
15 Correct 1 ms 356 KB Output is correct
16 Correct 4 ms 1272 KB Output is correct
17 Correct 17 ms 4568 KB Output is correct
18 Correct 32 ms 8900 KB Output is correct
19 Correct 40 ms 9032 KB Output is correct
20 Correct 1 ms 468 KB Output is correct
21 Correct 4 ms 1304 KB Output is correct
22 Correct 17 ms 4572 KB Output is correct
23 Correct 30 ms 8776 KB Output is correct
24 Correct 31 ms 8932 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 468 KB Output is correct
28 Correct 1 ms 468 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 4 ms 1240 KB Output is correct
31 Correct 4 ms 1232 KB Output is correct
32 Correct 20 ms 4432 KB Output is correct
33 Correct 20 ms 4600 KB Output is correct
34 Correct 42 ms 8504 KB Output is correct
35 Correct 41 ms 8388 KB Output is correct
36 Correct 42 ms 8644 KB Output is correct
37 Correct 40 ms 8648 KB Output is correct
38 Correct 0 ms 340 KB Output is correct
39 Correct 39 ms 8656 KB Output is correct
40 Correct 35 ms 8664 KB Output is correct
41 Correct 32 ms 8708 KB Output is correct
42 Correct 34 ms 8748 KB Output is correct