oj.uz

Submission #881440

# Submission time Handle Problem Language Result Execution time Memory
881440 2023-12-01T08:53:29 Z arashMLG Fancy Fence (CEOI20_fancyfence) C++17
100 / 100
 30 ms 19656 KB 
#include<bits/stdc++.h>
#ifdef LOCAL
#include "Essentials/algo/debug.h"
#else
#define debug(...) 69
#endif
using namespace std;
 
typedef long long     ll;
typedef pair<int,int> pii;
 
const int N = 5e5 + 23;
const ll mod = 1e9 + 7;
const ll inf = 1e18;
 
#define F           first
#define S           second
#define pb          push_back
#define kill(x)     cout<<x<<endl, exit(0);
#define all(x)      x.begin(),x.end()
#define sz(x)       (int)x.size()
#define lc          (v << 1)
#define rc          ((v<<1) |1)
#define int         ll
 
void ok(int &x) {
	while(x <0) x += mod;
	x %=mod;
}
 
int pw(int a,int b) {
	int ans=1;
	while(b) {
		if(b&1) ok(ans *= a);
		b >>=1;
		ok(a *= a);		
	}
	return ans;
}
 
int n;
int h[N],w[N];
int l[N],r[N];
stack<int> st;
int ps[N];
 
int tedad =0;
 
int32_t main() {
    cin.tie(nullptr)->sync_with_stdio(false);
	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++) {
		if(w[i] == 0) continue;
		tedad ++;
		for(int j = i+1; j <=n ; j ++) {
			if(h[j] == h[i]) {
				ok(w[i] += w[j]);
				w[j] = 0;
				h[j] = inf;
			} else break;
		}
	}
	int tinv = pw(2,mod-2);
	for(int i = 1; i<= n+1 ; i++) {
		ok(ps[i] = w[i] + ps[i-1]);
	}
	int ans=0;
	h[0] = 0,h[n+1] = 0;
	st.push(0);
	for(int i = 1; i<= n; i++) {
		if(w[i] == 0) continue;
		while(h[st.top()] >= h[i]) st.pop();
		l[i] = st.top();
		st.push(i);
	} while(sz(st)) st.pop();
	st.push(n+1);
	for(int i = n; i >= 1; i--) {
		if(w[i] == 0) continue;
		while(h[st.top()] > h[i]) st.pop();
		r[i] = st.top();
		st.push(i);
	}
	
	for(int i = 1; i<= n ; i++) {
		if(w[i] == 0) continue;
		int x = (h[i] * (h[i]+1)%mod*tinv%mod) %mod;
		//ok(ans += (w[i] * (w[i]+1)%mod*tinv%mod) %mod * x %mod);
		int one = (ps[i-1]- ps[l[i]] + 2 * mod) %mod;
		int two = (ps[r[i]-1] - ps[i]  + 2 *mod) %mod; 
		debug(one,two,x);
		int f = (ps[r[i]-1] - ps[l[i]] + 2 * mod) %mod;
		int three = f * (f+1)%mod*tinv%mod;
		ok(three -= one * (one+1)%mod * tinv%mod);
		ok(three -= two*(two+1) %mod * tinv%mod);
		ok(ans += three *x );
		//ok(ans -= x);
	}
	cout<<ans%mod << '\n';
	return 0;
}

Compilation message

fancyfence.cpp: In function 'int32_t main()':
fancyfence.cpp:5:20: warning: statement has no effect [-Wunused-value]
    5 | #define debug(...) 69
      |                    ^~
fancyfence.cpp:92:3: note: in expansion of macro 'debug'
   92 |   debug(one,two,x);
      |   ^~~~~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8536 KB Output is correct
2 Correct 2 ms 8540 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8540 KB Output is correct
2 Correct 1 ms 8540 KB Output is correct
3 Correct 2 ms 8540 KB Output is correct
4 Correct 2 ms 8540 KB Output is correct
5 Correct 1 ms 8540 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8536 KB Output is correct
2 Correct 1 ms 8540 KB Output is correct
3 Correct 9 ms 13404 KB Output is correct
4 Correct 23 ms 18244 KB Output is correct
5 Correct 17 ms 18260 KB Output is correct
6 Correct 21 ms 18256 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 8540 KB Output is correct
2 Correct 4 ms 8540 KB Output is correct
3 Correct 18 ms 10716 KB Output is correct
4 Correct 18 ms 12892 KB Output is correct
5 Correct 22 ms 12880 KB Output is correct
6 Correct 1 ms 8540 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8540 KB Output is correct
2 Correct 2 ms 8540 KB Output is correct
3 Correct 3 ms 8792 KB Output is correct
4 Correct 9 ms 10844 KB Output is correct
5 Correct 21 ms 12764 KB Output is correct
6 Correct 17 ms 12764 KB Output is correct
7 Correct 2 ms 8540 KB Output is correct
8 Correct 4 ms 8796 KB Output is correct
9 Correct 11 ms 10972 KB Output is correct
10 Correct 23 ms 17620 KB Output is correct
11 Correct 24 ms 17864 KB Output is correct
12 Correct 1 ms 8548 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8540 KB Output is correct
2 Correct 2 ms 8540 KB Output is correct
3 Correct 1 ms 8548 KB Output is correct
4 Correct 1 ms 8540 KB Output is correct
5 Correct 2 ms 8628 KB Output is correct
6 Correct 1 ms 8544 KB Output is correct
7 Correct 1 ms 8664 KB Output is correct
8 Correct 2 ms 8548 KB Output is correct
9 Correct 2 ms 8540 KB Output is correct
10 Correct 1 ms 8536 KB Output is correct
11 Correct 2 ms 8656 KB Output is correct
12 Correct 1 ms 8540 KB Output is correct
13 Correct 1 ms 8688 KB Output is correct
14 Correct 2 ms 8536 KB Output is correct
15 Correct 1 ms 8684 KB Output is correct
16 Correct 1 ms 8540 KB Output is correct

Subtask #7
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8536 KB Output is correct
2 Correct 2 ms 8540 KB Output is correct
3 Correct 1 ms 8540 KB Output is correct
4 Correct 1 ms 8540 KB Output is correct
5 Correct 1 ms 8540 KB Output is correct
6 Correct 1 ms 8540 KB Output is correct
7 Correct 1 ms 8656 KB Output is correct
8 Correct 1 ms 8540 KB Output is correct
9 Correct 1 ms 8656 KB Output is correct
10 Correct 2 ms 8660 KB Output is correct
11 Correct 9 ms 13404 KB Output is correct
12 Correct 19 ms 18284 KB Output is correct
13 Correct 19 ms 18268 KB Output is correct
14 Correct 17 ms 18248 KB Output is correct
15 Correct 1 ms 8540 KB Output is correct
16 Correct 3 ms 8860 KB Output is correct
17 Correct 13 ms 11848 KB Output is correct
18 Correct 18 ms 14796 KB Output is correct
19 Correct 24 ms 14924 KB Output is correct
20 Correct 2 ms 8540 KB Output is correct
21 Correct 3 ms 8928 KB Output is correct
22 Correct 10 ms 11868 KB Output is correct
23 Correct 21 ms 19656 KB Output is correct
24 Correct 21 ms 19652 KB Output is correct
25 Correct 1 ms 8536 KB Output is correct
26 Correct 2 ms 8540 KB Output is correct
27 Correct 1 ms 8668 KB Output is correct
28 Correct 1 ms 8540 KB Output is correct
29 Correct 2 ms 8540 KB Output is correct
30 Correct 3 ms 8796 KB Output is correct
31 Correct 3 ms 8796 KB Output is correct
32 Correct 11 ms 13660 KB Output is correct
33 Correct 12 ms 13916 KB Output is correct
34 Correct 21 ms 18792 KB Output is correct
35 Correct 30 ms 18804 KB Output is correct
36 Correct 23 ms 18784 KB Output is correct
37 Correct 28 ms 18752 KB Output is correct
38 Correct 1 ms 8552 KB Output is correct
39 Correct 20 ms 18764 KB Output is correct
40 Correct 22 ms 18768 KB Output is correct
41 Correct 20 ms 19032 KB Output is correct
42 Correct 21 ms 19284 KB Output is correct