Submission #476169

#	Time	Username	Problem	Language	Result	Execution time	Memory
476169		Neos	Building Bridges (CEOI17_building)	C++14	30 / 100	3084 ms	4404 KiB

building

#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
typedef pair<ll, ll> ii;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<ii> vii;
typedef vector<vi> vvi;
typedef vector<vll> vvll;
typedef vector<vii> vvii;
 
#define task "test"
#define fastIO ios::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL)
#define forw(i, l, r) for( ll i = (l) ; i < (r) ; i++ )
#define forb(i, r, l) for( ll i = (r) ; i >= (l) ; i-- )
#define sz(x) (int)x.size()
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define numBit(x) __builtin_popcount(x)
#define lb lower_bound
#define ub upper_bound
#define ar array
#define endl '\n'
 
const int dx[4] = {-1, 0, 1, 0};
const int dy[4] = {0, -1, 0, 1};
 
const int N = 2e5 + 7;
const ll inf = 0x3f3f3f3f;

int n;
ll h[N], w[N], dp[N];

ll sum(int i, int j) {
  return w[j] - w[i - 1];
}

ll sqr(int x) {
  return 1LL * x * x;
}

int main() {
  // fastIO;

  scanf("%d", &n);
  forw(i, 1, n + 1) scanf("%lld", &h[i]);
  forw(i, 1, n + 1) scanf("%lld", &w[i]), w[i] += w[i - 1];

  memset(dp, 0x3f, sizeof dp);
  dp[1] = 0;
  forw(i, 1, n + 1) forb(j, i - 1, 1) 
    dp[i] = min(dp[i], dp[j] + sqr(h[i] - h[j]) + sum(j + 1, i - 1));
  cout << dp[n] << endl;
}

/*
  Subtask 1: dp[i] = max(dp[j] + (hi - hj) ^ 2 + sum(w[i + 1]...w[j])
  Subtask 2: Chọn 2 cây cầu sao cho h[1] + sum(2, i - 1) + h[i] + sum(i + 1, j - 1) + h[j] + sum(j + 1, n - 1) + h[n] 

*/

Compilation message (stderr)

building.cpp: In function 'int main()':
building.cpp:50:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |   scanf("%d", &n);
      |   ~~~~~^~~~~~~~~~
building.cpp:51:26: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |   forw(i, 1, n + 1) scanf("%lld", &h[i]);
      |                     ~~~~~^~~~~~~~~~~~~~~
building.cpp:52:26: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |   forw(i, 1, n + 1) scanf("%lld", &w[i]), w[i] += w[i - 1];
      |                     ~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 30 / 30
• Subtask 2: 0 / 30
• Subtask 3: 0 / 40