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Submission #1008902

# Submission time Handle Problem Language Result Execution time Memory
1008902 2024-06-27T04:59:30 Z makanhulia Fancy Fence (CEOI20_fancyfence) C++17
100 / 100
 34 ms 6752 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define ll long long
#define ld long double
#define pb push_back
#define endl '\n'
#define all(v) v.begin(), v.end()
#define all1(v) v.begin() + 1, v.end()
#define rall(v) v.rbegin(), v.rend()
#define rall1(v) v.rbegin(), v.rend()-1
#define fr(m,n,k) for(int m=n;m<=k;m++)
#define frr(m,n,k) for(int m=n;m>=k;m--)
#define yes cout << "YES"
#define no cout << "NO"
#define yesm cout << "Yes"
#define nom cout << "No"
#define inf 1e18
#define ext {cout << -1; return;}
#define zxt {cout << 0; return;}
#define noxt {no;return;}
#define yesxt {yes;return;}
#define gcd(a,b) __gcd(a,b)
#define lcm(a,b) (a*(b/gcd(a,b)))
#define fill(x,s) memset(x, s, sizeof(x));
#define lb lower_bound
#define ub upper_bound
#define pi pair<int,int>
#define vi vector<int>
#define vvi vector<vi>
#define vs vector<string>
#define vpi vector<pi>
#define mii map<int,int>
#define si set<int>
#define fi first
#define se second
#define sz size()
#define el cout<<endl
 
int mod = 1e9 + 7;
// int mod = 998244353;
 
int ft(int n) {int ans = 1; for (int i = 1; i <= n; ++i) {ans = ans * i;} return ans;}
int binpow(int x, int y) {if (y == 0) return 1; int z = 1; while (y) {  if (y & 1) z = z * x % mod; x = x * x % mod; y >>= 1;} return z;}
int inv(int x) {return binpow(x, mod - 2);}
int bintoint(string s) {reverse(all(s)); int xx = 0; int m = 1; int z = s.sz; fr(j, 0, z) {xx += (s[j] == '1' ? m : 0); m <<= 1;} return xx;}
string inttobin(int x) {if (x == 0) return "0"; string s; while (x) {s += (x & 1) + '0'; x >>= 1;} reverse(all(s)); return s;}
string ads(string s, string p) {if (s.sz > p.sz) swap(s, p); int n = s.sz, m = p.sz; reverse(all(s)); reverse(all(p)); int tm = 0; string st; fr(i, 0, n - 1) {tm = s[i] - '0' + p[i] - '0' + tm; st += '0' + tm % 10; tm /= 10;} fr(i, n, m - 1) {tm = p[i] - '0' + tm; st += '0' + tm % 10; tm /= 10;} if (tm != 0) {st += '0' + tm % 10;} reverse(all(st)); return st;}
 
bool id, id1, id2;
int n, m, k, l, r, a, b, c, d, e, x, y, z, i, j, q, t, o;
int mi = inf, ma, sum, ans, num, cnt;
string s, p;
 
const int N = 3e5 + 5;
void solve() {
  cin >> n; vi h(n + 1), w(n + 1), ch(n + 1), suf(n + 2), pre(n + 1), bf(n + 1, 0), nx(n + 1, n + 1);
  fr(i, 1, n) cin >> h[i], ch[i] = h[i]; fr(i, 1, n) cin >> w[i], pre[i] = pre[i - 1] + w[i], pre[i] %= mod;
  sort(all1(ch));
  int iv = inv(2);
 
  suf[n + 1] = 0;
  frr(i, n, 1) suf[i] = suf[i + 1] + w[i], suf[i] %= mod;
 
  stack<int>st;
  fr(i, 1, n) {
    while (st.sz and h[st.top()] > h[i]) st.pop();
    if (st.sz) bf[i] = st.top();
    st.push(i);
  }
  st = {};
  frr(i, n, 1) {
    while (st.sz and h[st.top()] >= h[i]) st.pop();
    if (st.sz) nx[i] = st.top();
    st.push(i);
  }
  fr(i, 1, n) {
    l = bf[i], r = nx[i]; l++; r--;
    x = pre[i - 1] - pre[l - 1] + mod; x = x % mod;
    y = pre[r] - pre[i] + mod; y = y % mod;
 
    int now = h[i] * (h[i] + 1) / 2; now %= mod;
    int wid = ((x * y) % mod) + (((x + y) * w[i]) % mod) + (((w[i] * (w[i] + 1)) / 2) % mod);
    wid %= mod;
    ans += now * wid % mod; ans %= mod;
  }
  cout << ans;
}
signed main() {
  ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(0);
  int T = 1;
  // cin >> T;
  for (; T--;) {
    cout << fixed << setprecision(5); solve();
    cout << endl;
  } return 0;
}
// Tc, angka kecil), No Overthink(trivial tp modified),
// Check Kasus Khusus(1,2,1e18), ganti jd bentuk lain (2 case or etc)
// bedah 1 1 variable yg bisa dicari, cari dari jwbn ke ques
 
// Sorting : Iterate Greedy (pake data struct) / dp / binser
// Graphs / Tree : DFS / adj / dis[a][b] != dis[a][c] + dis[c][b] / indegree
// Yang keliatan kyk dp : bisa jd brute force doang
// Data Structure : BIT / DSU / Segtree, SparseT / dequeue
// Compression, Line Sweep
// Parity (2 or 3, mod 4..) klo dilakuin 2 kali jadi sama aja -> parity mod 2
 
/*
brute force, greedy, pref sum, 2pointer, gcd/lcm, even/odd
min/max, binser, bfs/dfs, iterate, multiple/divisor
 
bipartite graph,bitmasking, sliding window, konstanta
divconquer, djikstra, stack(prev and next smaller)
prefix difference
*/
 
// tools :
//__lg(x),__builtinpopcount,nextpermutation(), is_sorted / alpha / digit,

Compilation message

fancyfence.cpp: In function 'void solve()':
fancyfence.cpp:60:7: warning: unused variable 'iv' [-Wunused-variable]
   60 |   int iv = inv(2);
      |       ^~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 600 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 15 ms 3220 KB Output is correct
4 Correct 17 ms 6488 KB Output is correct
5 Correct 29 ms 6212 KB Output is correct
6 Correct 24 ms 5960 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 4 ms 856 KB Output is correct
3 Correct 18 ms 3472 KB Output is correct
4 Correct 33 ms 6616 KB Output is correct
5 Correct 30 ms 6744 KB Output is correct
6 Correct 1 ms 348 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 2 ms 860 KB Output is correct
4 Correct 10 ms 3416 KB Output is correct
5 Correct 19 ms 6748 KB Output is correct
6 Correct 33 ms 6736 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 4 ms 856 KB Output is correct
9 Correct 17 ms 3476 KB Output is correct
10 Correct 19 ms 6740 KB Output is correct
11 Correct 20 ms 6748 KB Output is correct
12 Correct 0 ms 348 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct

Subtask #7
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 600 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 9 ms 3216 KB Output is correct
12 Correct 28 ms 6472 KB Output is correct
13 Correct 28 ms 6236 KB Output is correct
14 Correct 16 ms 5976 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 4 ms 864 KB Output is correct
17 Correct 10 ms 3636 KB Output is correct
18 Correct 21 ms 6744 KB Output is correct
19 Correct 23 ms 6748 KB Output is correct
20 Correct 1 ms 352 KB Output is correct
21 Correct 2 ms 860 KB Output is correct
22 Correct 18 ms 3420 KB Output is correct
23 Correct 21 ms 6744 KB Output is correct
24 Correct 21 ms 6752 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 1 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 1 ms 512 KB Output is correct
30 Correct 3 ms 860 KB Output is correct
31 Correct 3 ms 860 KB Output is correct
32 Correct 17 ms 3164 KB Output is correct
33 Correct 16 ms 3164 KB Output is correct
34 Correct 33 ms 5728 KB Output is correct
35 Correct 22 ms 5724 KB Output is correct
36 Correct 34 ms 5724 KB Output is correct
37 Correct 25 ms 5728 KB Output is correct
38 Correct 0 ms 348 KB Output is correct
39 Correct 26 ms 5724 KB Output is correct
40 Correct 23 ms 5980 KB Output is correct
41 Correct 22 ms 5980 KB Output is correct
42 Correct 23 ms 6244 KB Output is correct