Submission #105367

#	Time	Username	Problem	Language	Result	Execution time	Memory
105367		Hideo	Wiring (IOI17_wiring)	C++14	100 / 100	73 ms	9608 KiB

wiring

#include <bits/stdc++.h>
//#include "grader.cpp"
#include "wiring.h"

using namespace std;

#define ll long long
#define mk make_pair
#define pb push_back
#define fr first
#define sc second
#define pi pair < int, int >
#define vi vector < int >
#define vii vector < pi >

const int N = 2e5 + 7;
const ll INF = 1e18 + 7;

ll dp[N], pr[N];
int bal[N];
int n, m;
int cb = (int) 1e5 + 1, s, f;

vii v;

long long min_total_length(std::vector<int> r, std::vector<int> b) {
	n = r.size();
	m = b.size();
	v.pb(mk(0, 0));
	int i = 0, j = 0;
	while (i < n && j < m){
        if (r[i] < b[j]){
            v.pb(mk(r[i], 1));
            i++;
        }
        else {
            v.pb(mk(-b[j], -1));
            j++;
        }
	}
	while (i < n) v.pb(mk(r[i], 1)), i++;
	while (j < m) v.pb(mk(-b[j], -1)), j++;
	for (int i = 1; i < v.size(); i++)
        pr[i] = pr[i - 1] + v[i].fr;

    memset(bal, -1, sizeof bal);
    bal[cb] = 0;
    for (int i = 1; i < v.size(); i++){
        cb += v[i].sc;
        ll r1, r2;
        r1 = r2 = INF;
        if (v[i].sc == 1){
            if (s)
                r1 = dp[i - 1] + abs(r[f] - b[s - 1]);
            if (s < b.size())
                r2 = dp[i - 1] + abs(r[f] - b[s]);
            f++;
        }
        else {
            if (f)
                r1 = dp[i - 1] + abs(b[s] - r[f - 1]);
            if (f < r.size())
                r2 = dp[i - 1] + abs(b[s] - r[f]);
            s++;
        }
        dp[i] = min(r1, r2);
        if (bal[cb] != -1)
            dp[i] = min(dp[i], dp[bal[cb]] + abs(pr[i] - pr[bal[cb]]));
        bal[cb] = i;
	}
    return dp[v.size() - 1];
}

Compilation message (stderr)

wiring.cpp: In function 'long long int min_total_length(std::vector<int>, std::vector<int>)':
wiring.cpp:43:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 1; i < v.size(); i++)
                  ~~^~~~~~~~~~
wiring.cpp:48:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 1; i < v.size(); i++){
                     ~~^~~~~~~~~~
wiring.cpp:55:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if (s < b.size())
                 ~~^~~~~~~~~~
wiring.cpp:62:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if (f < r.size())
                 ~~^~~~~~~~~~

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