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Submission #515051

# Submission time Handle Problem Language Result Execution time Memory
515051 2022-01-19T02:12:26 Z Killer2501 Fancy Fence (CEOI20_fancyfence) C++14
100 / 100
 47 ms 6724 KB 
#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define ull unsigned long long
#define pb push_back
#define pll pair<ll, ll>
#define pii pair<int, int>
#define fi first
#define se second
using namespace std;
const int N = 2e5+5;
const int M = 26;
const ll inf = 1e15;
const ll mod = 1e9+7;
const ld ex = 1e-9;
int n, t, k, m, d[N], lab[N];
ll ans, tong, a[N], b[N], c[N], l[N], r[N], cnt;
string s;
struct node
{
    int x, y, val;
    int vx, vy;
    node(){}
    node(int _x, int _vx, int _y, int _vy)
    {
        x = _x;
        vx = _vx;
        y = _y;
        vy = _vy;
    }
};
ll pw(ll k, ll n)
{
    ll total = 1;
    for(; n; n >>= 1)
    {
        if(n&1)total = total * k % mod;
        k = k * k % mod;
    }
    return total;
}
ll C(ll u, ll v)
{
    if(u > v)return 0;
    return a[v] * b[u] % mod * b[v-u] % mod;
}
void add(ll& x, ll y)
{
    x += y;
    if(x >= mod)x -= mod;
}
vector<int> vi;
void sol()
{
    cin >> n;
    for(int i = 1; i <= n; i ++)cin >> a[i];
    for(int i = 1; i <= n; i ++)
    {
        cin >> c[i];
        b[i] = b[i-1] + c[i];
    }
    for(int i = 1; i <= n; i ++)
    {
        while(!vi.empty() && a[vi.back()] > a[i])vi.pop_back();
        l[i] = vi.empty() ? 0 : vi.back();
        vi.pb(i);
    }
    vi.clear();
    for(int i = n; i > 0; i --)
    {
        while(!vi.empty() && a[vi.back()] >= a[i])vi.pop_back();
        r[i] = vi.empty() ? n+1 : vi.back();
        vi.pb(i);
    }
    for(int i = 1; i <= n; i ++)
    {
        tong = ((b[r[i]-1]-b[i])%mod*((b[i]-b[l[i]])%mod)%mod+c[i]*(c[i]+1)/2%mod+(b[i-1]-b[l[i]])%mod*c[i]%mod) % mod;
        cnt = a[i] * (a[i]+1) % mod * pw(2, mod-2) % mod;
        //cout << cnt <<" ";
        ans = (ans + cnt * tong  % mod) % mod;
        //cout << cnt <<" "<<tong << '\n';
    }
    cout << ans;
}
int main()
{
    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);
    #define task "test"
    if(fopen(task".inp", "r"))
	{
		freopen(task".inp", "r", stdin);
		freopen(task".out", "w", stdout);
    }
    int ntest = 1;
    //cin >> ntest;
    while(ntest -- > 0)
    sol();
}
/*

*/

Compilation message

fancyfence.cpp: In function 'int main()':
fancyfence.cpp:93:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   93 |   freopen(task".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
fancyfence.cpp:94:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   94 |   freopen(task".out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 0 ms 332 KB Output is correct
5 Correct 0 ms 332 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 15 ms 2512 KB Output is correct
4 Correct 32 ms 4692 KB Output is correct
5 Correct 32 ms 4560 KB Output is correct
6 Correct 31 ms 4324 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 4 ms 844 KB Output is correct
3 Correct 17 ms 2640 KB Output is correct
4 Correct 37 ms 4812 KB Output is correct
5 Correct 37 ms 4776 KB Output is correct
6 Correct 0 ms 332 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 6 ms 844 KB Output is correct
4 Correct 18 ms 2652 KB Output is correct
5 Correct 44 ms 4684 KB Output is correct
6 Correct 37 ms 4772 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 3 ms 844 KB Output is correct
9 Correct 18 ms 2636 KB Output is correct
10 Correct 41 ms 4776 KB Output is correct
11 Correct 41 ms 4772 KB Output is correct
12 Correct 1 ms 332 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 0 ms 324 KB Output is correct
4 Correct 0 ms 316 KB Output is correct
5 Correct 0 ms 312 KB Output is correct
6 Correct 1 ms 308 KB Output is correct
7 Correct 0 ms 300 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 1 ms 308 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 2 ms 336 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 0 ms 332 KB Output is correct

Subtask #7
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 0 ms 316 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 0 ms 332 KB Output is correct
7 Correct 1 ms 324 KB Output is correct
8 Correct 1 ms 320 KB Output is correct
9 Correct 1 ms 308 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 18 ms 3020 KB Output is correct
12 Correct 31 ms 5852 KB Output is correct
13 Correct 31 ms 5652 KB Output is correct
14 Correct 31 ms 5452 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 4 ms 972 KB Output is correct
17 Correct 18 ms 3548 KB Output is correct
18 Correct 39 ms 6712 KB Output is correct
19 Correct 39 ms 6724 KB Output is correct
20 Correct 1 ms 336 KB Output is correct
21 Correct 4 ms 972 KB Output is correct
22 Correct 19 ms 3636 KB Output is correct
23 Correct 35 ms 6548 KB Output is correct
24 Correct 35 ms 6596 KB Output is correct
25 Correct 0 ms 296 KB Output is correct
26 Correct 1 ms 332 KB Output is correct
27 Correct 1 ms 336 KB Output is correct
28 Correct 1 ms 332 KB Output is correct
29 Correct 1 ms 336 KB Output is correct
30 Correct 4 ms 844 KB Output is correct
31 Correct 5 ms 844 KB Output is correct
32 Correct 23 ms 3088 KB Output is correct
33 Correct 19 ms 3268 KB Output is correct
34 Correct 37 ms 5944 KB Output is correct
35 Correct 35 ms 5964 KB Output is correct
36 Correct 47 ms 6228 KB Output is correct
37 Correct 37 ms 6148 KB Output is correct
38 Correct 0 ms 316 KB Output is correct
39 Correct 42 ms 6076 KB Output is correct
40 Correct 35 ms 6088 KB Output is correct
41 Correct 39 ms 6208 KB Output is correct
42 Correct 37 ms 6460 KB Output is correct