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Submission #501858

# Submission time Handle Problem Language Result Execution time Memory
501858 2022-01-04T17:23:13 Z SirCovidThe19th Fancy Fence (CEOI20_fancyfence) C++17
100 / 100
 172 ms 4164 KB 
#include <bits/stdc++.h>
using namespace std; 

#define ll long long

const int md = 1e9 + 7;

struct mint{
	int v;
	mint() : v(0) {}
	mint(ll v_) : v(int(v_ % md)){ if (v < 0) v += md; }
	explicit operator int() const{ return v; }
	friend std::ostream& operator << (std::ostream& out, const mint& n){ return out << int(n); }
	friend std::istream& operator >> (std::istream& in, mint& n){ ll v_; in >> v_; n = mint(v_); return in; }
 
	friend bool operator == (const mint& a, const mint& b){ return a.v == b.v; }
	friend bool operator != (const mint& a, const mint& b){ return a.v != b.v; }
    friend bool operator < (const mint& a, const mint& b){ return a.v < b.v; }
    friend bool operator <= (const mint& a, const mint& b){ return a.v <= b.v; }
    friend bool operator > (const mint& a, const mint& b){ return a.v > b.v; }
	friend bool operator >= (const mint& a, const mint& b){ return a.v >= b.v; }

	mint& operator += (const mint& o){ ((v += o.v) >= md) ? v -= md : 0; return *this; }
	mint& operator -= (const mint& o){ ((v -= o.v) < 0) ? v += md : 0; return *this; }
	mint& operator *= (const mint& o){ v = int((ll)v * o.v % md); return *this; }
	mint& operator /= (const mint& o){ return (*this) *= inv(o); }

	mint operator - () const{ return mint(-v); }
	mint& operator ++ (){ return *this += 1; }
	mint& operator -- (){ return *this -= 1; }
	friend mint operator + (mint a, const mint& b){ return a += b; }
	friend mint operator - (mint a, const mint& b){ return a -= b; }
	friend mint operator * (mint a, const mint& b){ return a *= b; }
	friend mint operator / (mint a, const mint& b){ return a /= b; }

    friend mint pow(mint a, ll p){ return p == 0 ? 1 : pow(a * a, p / 2) * (p & 1 ? a : 1);	}
	friend mint inv(const mint& a){ return pow(a, md - 2); }
};
mint sum(mint x){ return x * (x + 1) / 2; }

int main(){
    int n; cin >> n; 
    mint h[n + 1], w[n + 1], p[n + 1], dp[n + 1], ans; 

    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++) p[i] = p[i - 1] + w[i];
    
    stack<int> stk; stk.push(0);

    for (int i = 1; i <= n; i++){
        while (!stk.empty() and h[stk.top()] >= h[i]) stk.pop();
        dp[i] = dp[stk.top()] + sum(h[i]) * (p[i] - p[stk.top()]);
        ans += dp[stk.top()] * w[i] + sum(h[i]) * (p[i - 1] - p[stk.top()]) * w[i] + sum(h[i]) * sum(w[i]);
        stk.push(i);
    }
    cout<<ans<<endl;
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 2 ms 308 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 288 KB Output is correct
2 Correct 0 ms 296 KB Output is correct
3 Correct 0 ms 288 KB Output is correct
4 Correct 0 ms 296 KB Output is correct
5 Correct 1 ms 204 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 2 ms 204 KB Output is correct
3 Correct 71 ms 1540 KB Output is correct
4 Correct 145 ms 2992 KB Output is correct
5 Correct 143 ms 2984 KB Output is correct
6 Correct 141 ms 2972 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 204 KB Output is correct
2 Correct 17 ms 588 KB Output is correct
3 Correct 89 ms 2056 KB Output is correct
4 Correct 165 ms 3740 KB Output is correct
5 Correct 167 ms 3868 KB Output is correct
6 Correct 0 ms 204 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 296 KB Output is correct
2 Correct 2 ms 204 KB Output is correct
3 Correct 17 ms 640 KB Output is correct
4 Correct 85 ms 1932 KB Output is correct
5 Correct 164 ms 3744 KB Output is correct
6 Correct 166 ms 3880 KB Output is correct
7 Correct 2 ms 204 KB Output is correct
8 Correct 17 ms 648 KB Output is correct
9 Correct 83 ms 2048 KB Output is correct
10 Correct 160 ms 4004 KB Output is correct
11 Correct 166 ms 4164 KB Output is correct
12 Correct 1 ms 296 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 2 ms 296 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 292 KB Output is correct
8 Correct 2 ms 308 KB Output is correct
9 Correct 2 ms 204 KB Output is correct
10 Correct 2 ms 300 KB Output is correct
11 Correct 1 ms 288 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 2 ms 204 KB Output is correct
14 Correct 2 ms 204 KB Output is correct
15 Correct 2 ms 296 KB Output is correct
16 Correct 0 ms 204 KB Output is correct

Subtask #7
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 2 ms 308 KB Output is correct
3 Correct 1 ms 272 KB Output is correct
4 Correct 2 ms 308 KB Output is correct
5 Correct 0 ms 296 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 288 KB Output is correct
8 Correct 0 ms 292 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 2 ms 296 KB Output is correct
11 Correct 70 ms 1576 KB Output is correct
12 Correct 140 ms 2884 KB Output is correct
13 Correct 142 ms 2984 KB Output is correct
14 Correct 142 ms 2964 KB Output is correct
15 Correct 2 ms 204 KB Output is correct
16 Correct 18 ms 636 KB Output is correct
17 Correct 81 ms 1924 KB Output is correct
18 Correct 166 ms 3732 KB Output is correct
19 Correct 165 ms 3876 KB Output is correct
20 Correct 2 ms 300 KB Output is correct
21 Correct 17 ms 648 KB Output is correct
22 Correct 82 ms 2084 KB Output is correct
23 Correct 159 ms 4036 KB Output is correct
24 Correct 162 ms 4116 KB Output is correct
25 Correct 1 ms 292 KB Output is correct
26 Correct 1 ms 204 KB Output is correct
27 Correct 2 ms 296 KB Output is correct
28 Correct 2 ms 304 KB Output is correct
29 Correct 2 ms 304 KB Output is correct
30 Correct 18 ms 580 KB Output is correct
31 Correct 16 ms 616 KB Output is correct
32 Correct 80 ms 1920 KB Output is correct
33 Correct 85 ms 1928 KB Output is correct
34 Correct 159 ms 3476 KB Output is correct
35 Correct 159 ms 3476 KB Output is correct
36 Correct 167 ms 3864 KB Output is correct
37 Correct 172 ms 3732 KB Output is correct
38 Correct 0 ms 204 KB Output is correct
39 Correct 166 ms 3772 KB Output is correct
40 Correct 161 ms 3736 KB Output is correct
41 Correct 164 ms 3780 KB Output is correct
42 Correct 168 ms 4000 KB Output is correct