Submission #34674

#	Time	Username	Problem	Language	Result	Execution time	Memory
34674		mohammad_kilani	Wiring (IOI17_wiring)	C++14	13 / 100	36 ms	5148 KiB

wiring

#include "wiring.h"
#include <bits/stdc++.h>
using namespace std;
#define red 1
#define blue 0
const int N = 200010;
long long dp[N];
vector< pair<int,bool> > v;
int n;
long long solve(int i){
	if(i == n) return 0;
	if(dp[i] != -1) return dp[i];
	dp[i] = 1e18;
	int idx = -1;
	for(int j=i+1;j<n;j++){
		if(v[j].second != v[i].second){
			idx = j;
			break;
		}
	}
	if(idx == -1) return dp[i];
	long long sum = 0;
	for(int j=i;j<idx;j++) sum += abs(v[idx].first - v[j].first);
	int idx2 = n;
	for(int j=idx+1;j<n;j++){
		if(v[i].second == v[idx].second){
			idx2 = j;
			break;
		}
	}
	for(int j=idx;j<idx2;j++){
		sum+= abs(v[j].first - v[idx].first);
		if(j - idx >= idx - i) sum += abs(v[idx].first - v[idx-1].first);
		dp[i] = min(dp[j],sum + solve(j+1));
	}
	for(int j=idx2;j<n;j++){
		if(v[j].second == v[idx].second) break;
		sum+= abs(v[j].first-v[idx].first);
		dp[i] = min(dp[i],sum + solve(j+1));
	}
	return dp[i];
}




long long min_total_length(std::vector<int> r, std::vector<int> b) {
	if(r.back() < b[0]){
		int n =r.size() , m = b.size();
		long long sum = 0 ;
		int idx = 0 ;
		int idx2 = 0;
		for(int i=0;i<min(n,m);i++) sum += abs(r[idx++] - b[idx2++]);
		for(int i=idx;i<r.size();i++) sum+= abs(r[i] - b[0]);
		for(int i=idx2;i<b.size();i++) sum+= abs(b[i] - r.back());
		return sum;
	}
	memset(dp,-1,sizeof(dp));
	int j =0 ;
	for(int i=0;i<r.size();i++){
		while(j < b.size() && b[j] < r[i]) v.push_back(make_pair(b[j++],blue));
		v.push_back(make_pair(r[i],red));
	}
	while(j < b.size()) v.push_back(make_pair(b[j++],blue));
	n = v.size();
	return solve(0);

}

Compilation message (stderr)

wiring.cpp: In function 'long long int min_total_length(std::vector<int>, std::vector<int>)':
wiring.cpp:54:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=idx;i<r.size();i++) sum+= abs(r[i] - b[0]);
                  ^
wiring.cpp:55:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=idx2;i<b.size();i++) sum+= abs(b[i] - r.back());
                   ^
wiring.cpp:60:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<r.size();i++){
               ^
wiring.cpp:61:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(j < b.size() && b[j] < r[i]) v.push_back(make_pair(b[j++],blue));
           ^
wiring.cpp:64:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while(j < b.size()) v.push_back(make_pair(b[j++],blue));
          ^

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