Submission #1199531

#	Time	Username	Problem	Language	Result	Execution time	Memory
1199531		thewizardman	Fancy Fence (CEOI20_fancyfence)	C++20	0 / 100	5 ms	328 KiB

fancyfence

#include <bits/stdc++.h>
using namespace std;
#define ll long long

ll n, h[100001], w[100001], dp[100001], md = 1e9+7, ans;
vector<pair<ll, ll>> v;

ll bruh(ll a, ll b) {
  return ((a * b) / 2ll) % md;
}

int main() {
  scanf("%lld", &n);
  for (int i = 0; i < n; i++) scanf("%lld", h+i), h[i]++;
  for (int i = 0; i < n; i++) scanf("%lld", w+i), w[i]++;
  for (int i = 0; i < n; i++) {
    ll consec = 0;
    while (!v.empty() && v.back().first > h[i]) consec += v.back().second, v.pop_back();
    v.push_back({h[i], consec + w[i]});
    ll k = 0, asdf = 0;
    for (auto it = v.rbegin(); it != v.rend(); it++) {
      auto [h, w] = *it;
      ans = (ans + bruh(h, h-1) * bruh(w+k, w-1)) % md;
      k += w;
    }
  }
  printf("%lld", ans);
}

Compilation message (stderr)

fancyfence.cpp: In function 'int main()':
fancyfence.cpp:13:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |   scanf("%lld", &n);
      |   ~~~~~^~~~~~~~~~~~
fancyfence.cpp:14:36: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |   for (int i = 0; i < n; i++) scanf("%lld", h+i), h[i]++;
      |                               ~~~~~^~~~~~~~~~~~~
fancyfence.cpp:15:36: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |   for (int i = 0; i < n; i++) scanf("%lld", w+i), w[i]++;
      |                               ~~~~~^~~~~~~~~~~~~

• Subtask 1: 0 / 0
• Subtask 2: 0 / 12
• Subtask 3: 0 / 13
• Subtask 4: 0 / 15
• Subtask 5: 0 / 15
• Subtask 6: 0 / 18
• Subtask 7: 0 / 27