Submission #855130

#TimeUsernameProblemLanguageResultExecution timeMemory
855130anhphantFancy Fence (CEOI20_fancyfence)C++14
25 / 100
13 ms10076 KiB
#include <bits/stdc++.h> using namespace std; typedef long long ll; #define endl '\n' ll N, H[500007], W[500007]; const ll mod = 1e9 + 7; void initialize() { ios_base :: sync_with_stdio(0); cin.tie(0); cout.tie(0); if (fopen("FILE.INP", "r")) { freopen("FILE.INP", "r", stdin); freopen("FILE.OUT", "w", stdout); } cin >> N; for(int i = 1; i <= N; ++i) cin >> H[i]; for(int i = 1; i <= N; ++i) cin >> W[i]; } namespace subtask1 { ll A[1007][1007]; void solve() { ll lastw = 0; for(int i = 1; i <= N; ++i) { for(int h = 1; h <= H[i]; ++h) { for(int w = lastw + 1; w <= lastw + W[i]; ++w) { A[h][w] = 1; } } lastw += W[i]; } /*for(int i = 1; i <= 50; ++i) { for(int j = 1; j <= 50; ++j) { cerr << A[i][j]; } cerr << endl; }*/ for(int i = 1; i <= 50; ++i) { for(int j = 1; j <= 50; ++j) { A[i][j] = A[i][j - 1] + A[i - 1][j] + A[i][j] - A[i - 1][j - 1]; } } ll ans = 0; for(int i = 1; i <= 50; ++i) { for(int j = 1; j <= 50; ++j) { for(int k = i; k <= 50; ++k) { for(int l = j; l <= 50; ++l) { ans += (A[k][l] - A[i - 1][l] - A[k][j - 1] + A[i - 1][j - 1]) == ((k - i + 1) * (l - j + 1)); } } } } cout << ans; } void process() { memset(A, 0, sizeof(A)); solve(); } } namespace subtask2 { ll fsum(ll n) { ll x1 = n; ll x2 = n + 1; if (x1 % 2 == 0) x1 /= 2; else x2 /= 2; x1 %= mod; x2 %= mod; return (x1 * x2) % mod; } void solve() { vector<ll> split; split.push_back(0); for(int i = 1; i <= N; ++i) { if (H[i] == 1 && split.back() > 0) split.push_back(0); if (H[i] == 2) split[split.size() - 1] += W[i]; } ll sum1 = accumulate(W + 1, W + 1 + N, 0LL); sum1 = fsum(sum1); ll sum2 = 0; for(ll c : split) { sum2 = (sum2 + fsum(c)); sum2 %= mod; } sum2 = (sum2 * 2) % mod; cout << (sum1 + sum2) % mod; } void process() { solve(); } } int main() { initialize(); if (N <= 50 && *max_element(H + 1, H + 1 + N) <= 50 && *max_element(W + 1, W + 1 + N) == 1) subtask1 :: solve(); else subtask2 :: solve(); }

Compilation message (stderr)

fancyfence.cpp: In function 'void initialize()':
fancyfence.cpp:13:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |         freopen("FILE.INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
fancyfence.cpp:14:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |         freopen("FILE.OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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