Submission #56256

#	Time	Username	Problem	Language	Result	Execution time	Memory
56256		ngkan146	Wiring (IOI17_wiring)	C++11	0 / 100	47 ms	11008 KiB

wiring

#include "wiring.h"
#include <bits/stdc++.h>
#define ll long long
using namespace std;
typedef pair<int,int> ii;
ll dp[200005], prefixSum[200005], rem[200005];
ll min_total_length(vector<int> r, vector<int> b) {
    vector <ii> lst;
    int piR = 0, piB = 0;
    while(piR < r.size() || piB < b.size()){
        if (piR == r.size())
            lst.push_back(ii(b[piB++], 2));
        else if (piB == b.size())
            lst.push_back(ii(r[piR++], 1));
        else{
            if (r[piR] < b[piB])
                lst.push_back(ii(r[piR++], 1));
            else
                lst.push_back(ii(b[piB++], 2));
        }
    }
    piR = 0, piB = 0;
    int slope = 0, lrange = 0, rrange = 0;
    r.push_back((int)2e9+5);
    b.push_back((int)2e9+5);
    for(int i=0;i<lst.size();i++){
        dp[i+1] = (ll) 1e18;

        prefixSum[i+1] = prefixSum[i] + (lst[i].second == 1 ? 1 : -1) * lst[i].first;
        slope += (lst[i].second == 1 ? 1 : -1);

        while(r[piR+1] <= lst[i].first)  piR++;
        while(b[piB+1] <= lst[i].first)  piB++;

        if (lst[i].second == 1)
            dp[i+1] = dp[i] + min(abs(lst[i].first - b[piB]),  abs(lst[i].first - b[piB+1]));
        else
            dp[i+1] = dp[i] + min(abs(lst[i].first - r[piR]),  abs(lst[i].first - r[piR+1]));

        if (lrange <= slope && slope <= rrange)
            dp[i+1] = min(dp[i+1], dp[rem[slope]] + abs(prefixSum[i+1] - prefixSum[rem[slope]]));

        lrange = min(lrange, slope);
        rrange = max(rrange, slope);
        rem[slope] = i+1;
    }
	return dp[lst.size()];
}

Compilation message (stderr)

wiring.cpp: In function 'long long int min_total_length(std::vector<int>, std::vector<int>)':
wiring.cpp:10:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while(piR < r.size() || piB < b.size()){
           ~~~~^~~~~~~~~~
wiring.cpp:10:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while(piR < r.size() || piB < b.size()){
                             ~~~~^~~~~~~~~~
wiring.cpp:11:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if (piR == r.size())
             ~~~~^~~~~~~~~~~
wiring.cpp:13:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         else if (piB == b.size())
                  ~~~~^~~~~~~~~~~
wiring.cpp:26:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<lst.size();i++){
                 ~^~~~~~~~~~~

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