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Submission #292923

# Submission time Handle Problem Language Result Execution time Memory
292923 2020-09-07T14:49:57 Z arnold518 Fancy Fence (CEOI20_fancyfence) C++14
100 / 100
 86 ms 7544 KB 
#include <bits/stdc++.h>
using namespace std;

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

const int MAXN = 1e5;
const ll INF = 1e18;
const ll MOD = 1e9+7;

int N;
ll W[MAXN+10], H[MAXN+10];

pll tree[MAXN*4+10];

void init(int node, int tl, int tr)
{
	if(tl==tr)
	{
		tree[node]={H[tl], tl};
		return;
	}
	int mid=tl+tr>>1;
	init(node*2, tl, mid);
	init(node*2+1, mid+1, tr);
	tree[node]=min(tree[node*2], tree[node*2+1]);
}

pll query(int node, int tl, int tr, int l, int r)
{
	if(l<=tl && tr<=r) return tree[node];
	if(r<tl || tr<l) return {INF, -1};
	int mid=tl+tr>>1;
	return min(query(node*2, tl, mid, l, r), query(node*2+1, mid+1, tr, l, r));
}
	
ll ans=0;

ll f(ll x)
{
	x%=MOD;
	return x*(x+1)%MOD*((MOD+1)/2)%MOD;
}

ll f(ll l, ll r)
{
	return ((f(r)-f(l))%MOD+MOD)%MOD;
}

void solve(int l, int r, ll h)
{
	if(l>r) return;
	pll p=query(1, 1, N, l, r);

	ans+=f(h, p.first)*f(0, W[r]-W[l-1])%MOD;
	ans%=MOD;

	solve(l, p.second-1, p.first);
	solve(p.second+1, r, p.first);
}

int main()
{
	scanf("%d", &N);
	for(int i=1; i<=N; i++) scanf("%lld", &H[i]);
	for(int i=1; i<=N; i++) scanf("%lld", &W[i]), W[i]+=W[i-1];

	init(1, 1, N);
	solve(1, N, 0);
	printf("%lld\n", ans);
}

Compilation message

fancyfence.cpp: In function 'void init(int, int, int)':
fancyfence.cpp:24:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   24 |  int mid=tl+tr>>1;
      |          ~~^~~
fancyfence.cpp: In function 'pll query(int, int, int, int, int)':
fancyfence.cpp:34:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   34 |  int mid=tl+tr>>1;
      |          ~~^~~
fancyfence.cpp: In function 'int main()':
fancyfence.cpp:65:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   65 |  scanf("%d", &N);
      |  ~~~~~^~~~~~~~~~
fancyfence.cpp:66:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   66 |  for(int i=1; i<=N; i++) scanf("%lld", &H[i]);
      |                          ~~~~~^~~~~~~~~~~~~~~
fancyfence.cpp:67:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   67 |  for(int i=1; i<=N; i++) scanf("%lld", &W[i]), W[i]+=W[i-1];
      |                          ~~~~~^~~~~~~~~~~~~~~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 0 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 30 ms 3200 KB Output is correct
4 Correct 58 ms 6008 KB Output is correct
5 Correct 57 ms 6008 KB Output is correct
6 Correct 59 ms 6008 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 6 ms 1024 KB Output is correct
3 Correct 41 ms 3200 KB Output is correct
4 Correct 59 ms 6008 KB Output is correct
5 Correct 86 ms 6008 KB Output is correct
6 Correct 1 ms 384 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 384 KB Output is correct
3 Correct 12 ms 1024 KB Output is correct
4 Correct 30 ms 3200 KB Output is correct
5 Correct 59 ms 6008 KB Output is correct
6 Correct 61 ms 6008 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 6 ms 1024 KB Output is correct
9 Correct 29 ms 3196 KB Output is correct
10 Correct 61 ms 5976 KB Output is correct
11 Correct 76 ms 5924 KB Output is correct
12 Correct 1 ms 384 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 288 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 0 ms 384 KB Output is correct
7 Correct 0 ms 384 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 0 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 1 ms 384 KB Output is correct
15 Correct 1 ms 384 KB Output is correct
16 Correct 1 ms 384 KB Output is correct

Subtask #7
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 0 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 0 ms 256 KB Output is correct
9 Correct 0 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 28 ms 3208 KB Output is correct
12 Correct 60 ms 6008 KB Output is correct
13 Correct 57 ms 6020 KB Output is correct
14 Correct 59 ms 6016 KB Output is correct
15 Correct 1 ms 384 KB Output is correct
16 Correct 6 ms 1024 KB Output is correct
17 Correct 29 ms 3200 KB Output is correct
18 Correct 60 ms 6008 KB Output is correct
19 Correct 60 ms 6016 KB Output is correct
20 Correct 1 ms 384 KB Output is correct
21 Correct 6 ms 1024 KB Output is correct
22 Correct 29 ms 3200 KB Output is correct
23 Correct 60 ms 6008 KB Output is correct
24 Correct 63 ms 6008 KB Output is correct
25 Correct 0 ms 384 KB Output is correct
26 Correct 1 ms 384 KB Output is correct
27 Correct 1 ms 384 KB Output is correct
28 Correct 1 ms 384 KB Output is correct
29 Correct 1 ms 384 KB Output is correct
30 Correct 6 ms 1024 KB Output is correct
31 Correct 7 ms 1024 KB Output is correct
32 Correct 32 ms 3196 KB Output is correct
33 Correct 33 ms 3192 KB Output is correct
34 Correct 67 ms 6016 KB Output is correct
35 Correct 64 ms 6008 KB Output is correct
36 Correct 69 ms 6032 KB Output is correct
37 Correct 65 ms 6008 KB Output is correct
38 Correct 0 ms 384 KB Output is correct
39 Correct 67 ms 6012 KB Output is correct
40 Correct 71 ms 6136 KB Output is correct
41 Correct 72 ms 6272 KB Output is correct
42 Correct 64 ms 7544 KB Output is correct