Submission #42992

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
42992	2018-03-07 15:25:01	alenam0161	Wiring (IOI17_wiring)	C++14	100 / 100	93 ms	75700 KiB

wiring

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#include "wiring.h"
#include <iostream>
#include <algorithm>
using namespace std;
vector<long long> pre, suf;
vector<pair<long long, int>> all;
int n;
long long pre_gum(int l, int r) {
  if (l > r)return 0;
  if (l == 0) {
    return pre[r] - (r - l + 1)*all[0].first;
  }
  return pre[r] - pre[l - 1] - all[l].first * (r - l + 1);
}
long long suf_gum(int l, int r) {
  if (l > r)return 0;
  return suf[l] - suf[r + 1] - (all[n - 1].first - all[r].first) * (r - l + 1);
}
long long sum(int l, int mid, int r) {
  return suf_gum(l, mid) + pre_gum(mid + 1, r) + 1ll * max(mid - l + 1, r - mid)*(all[mid + 1].first - all[mid].first);
}
long long min_total_length(std::vector<int> r, std::vector<int> b) {
  for (int to : r)all.push_back({ to,1 });
  for (int to : b)all.push_back({ to,2 });
  int n = all.size();
  ::n = n;
  sort(all.begin(), all.end());
  vector<int> left(n + 1, 0);
  for (int i = 0; i < n; ++i) {
    if (i == 0 || (all[i].second != all[i - 1].second)) {
 
 
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Compilation message (stderr)

wiring.cpp: In function 'long long int min_total_length(std::vector<int>, std::vector<int>)':
wiring.cpp:74:41: warning: 'lf' may be used uninitialized in this function [-Wmaybe-uninitialized]
     if (pos == left[lf])dp[i] = mn + sum(left[lf], lf, i);
                                         ^

• Subtask 1: 7 / 7
• Subtask 2: 13 / 13
• Subtask 3: 10 / 10
• Subtask 4: 25 / 25
• Subtask 5: 45 / 45