Submission #406755

#	Time	Username	Problem	Language	Result	Execution time	Memory
406755		casperwang	Wiring (IOI17_wiring)	C++14	0 / 100	1096 ms	10568 KiB

wiring

#include "wiring.h"
#include <bits/stdc++.h>
#define int long long
#define pb emplace_back
#define All(x) x.begin(), x.end()
#define pii pair<int,int>
#define ff first
#define ss second
using namespace std;
#define debug(args...) kout("[ " + string(#args) + " ]", args)
void kout() { cerr << endl; }
template <class T, class ...U> void kout(T a, U ...b) { cerr << a << ' ',kout(b...); }
template <class T> void pary(T L, T R) { while (L != R) cerr << *L << " \n"[++L==R]; }

const int INF = 1e18;

vector<pii> build(vector<signed> r, vector<signed> b) {
	vector<pii> arr;
	for (int i : r) arr.pb(i, 0);
	for (int i : b) arr.pb(i, 1);
	sort(All(arr));
	return arr;
}

int solve(vector<signed> r, vector<signed> b) {
	vector<pii> arr = build(r, b);
	vector<int> dp(arr.size()+1);
	int kL, kR = -1;
	int inc = 0;
	bool flag = false;
	for (int i = 0; i < arr.size(); i++) {
		if (flag) {
			inc += arr[i].ff;
			int dec = (i - kR) * (- arr[kR].ff);
			dp[i+1] = dp[kR] + inc + dec;
			for (int j = kR-1; j >= kL; j--) {
				if (kR - j + 1 > i - kR)
					dec += arr[kR+1].ff - arr[kR].ff;
				dec += arr[kR].ff - arr[j].ff;
				dp[i+1] = min(dp[i+1], dp[j] + inc + dec);
			}
		} else dp[i+1] = INF;
		if (i+1 < arr.size() && arr[i].ss != arr[i+1].ss) {
			kL = kR + 1, kR = i;
			flag = true;
			inc = 0;
		}
	}
	return dp[arr.size()];
}

int min_total_length(vector<signed> r, vector<signed> b) {
	int ans = solve(r, b);
	for (int i = 0; i < r.size(); i++) r[i] = -r[i];
	for (int i = 0; i < b.size(); i++) b[i] = -b[i];
	ans = min(ans, solve(r, b));
	return ans;
}

Compilation message (stderr)

wiring.cpp: In function 'long long int solve(std::vector<int>, std::vector<int>)':
wiring.cpp:31:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |  for (int i = 0; i < arr.size(); i++) {
      |                  ~~^~~~~~~~~~~~
wiring.cpp:43:11: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |   if (i+1 < arr.size() && arr[i].ss != arr[i+1].ss) {
      |       ~~~~^~~~~~~~~~~~
wiring.cpp: In function 'long long int min_total_length(std::vector<int>, std::vector<int>)':
wiring.cpp:54:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |  for (int i = 0; i < r.size(); i++) r[i] = -r[i];
      |                  ~~^~~~~~~~~~
wiring.cpp:55:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |  for (int i = 0; i < b.size(); i++) b[i] = -b[i];
      |                  ~~^~~~~~~~~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 13
• Subtask 3: 0 / 10
• Subtask 4: 0 / 25
• Subtask 5: 0 / 45