Submission #826370

#	Time	Username	Problem	Language	Result	Execution time	Memory
826370		tolbi	Wiring (IOI17_wiring)	C++17	20 / 100	19 ms	2620 KiB

wiring

#include <bits/stdc++.h>
using namespace std;
#include "wiring.h"

long long ara(long long a, long long b){
	if (a>b) return a-b;
	return b-a;
}
long long subtask1(vector<int> &r, vector<int> &b){
	int n = r.size();
	int m = b.size();
	vector<vector<long long>> dp(n, vector<long long>(m,-1));
	function<long long(int,int)> f;
	f = [&](int x, int y)->long long{
		if (dp[x][y]!=-1) return dp[x][y];
		if (x==n-1 && y==m-1){
			return ara(r[x],b[y]);
		}
		if (x==n-1){
			return dp[x][y]=ara(r[x],b[y])+f(x,y+1);
		}
		if (y==m-1){
			return dp[x][y]=ara(r[x],b[y])+f(x+1,y);
		}
		dp[x][y]=ara(r[x],b[y]);
		long long mava = f(x+1,y+1);
		mava=min(mava,f(x,y+1));
		mava=min(mava,f(x+1,y));
		return dp[x][y]+=mava;
	};
	return f(0,0);
}
long long subtask2(vector<int> &r, vector<int> &b){
	long long ans = 0;
	reverse(r.begin(), r.end());
	if (r.size()>b.size()){
		for (int i = 0; i < b.size(); i++){
			ans+=ara(r[i],b[i]);
		}
		for (int i = b.size(); i < r.size(); i++){
			ans+=ara(b[0],r[i]);
		}
	}
	else {
		for (int i = 0; i < r.size(); i++){
			ans+=ara(r[i],b[i]);
		}
		for (int i = r.size(); i < b.size(); i++){
			ans+=ara(r[0],b[i]);
		}
	}
	return ans;
}
long long min_total_length(std::vector<int> r, std::vector<int> b) {
	if (r.size()<=200 && b.size()<=200) return subtask1(r,b);
	if (*max_element(r.begin(), r.end())<*min_element(b.begin(), b.end())) return subtask2(r,b);
}

Compilation message (stderr)

wiring.cpp: In function 'long long int subtask2(std::vector<int>&, std::vector<int>&)':
wiring.cpp:37:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |   for (int i = 0; i < b.size(); i++){
      |                   ~~^~~~~~~~~~
wiring.cpp:40:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |   for (int i = b.size(); i < r.size(); i++){
      |                          ~~^~~~~~~~~~
wiring.cpp:45:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |   for (int i = 0; i < r.size(); i++){
      |                   ~~^~~~~~~~~~
wiring.cpp:48:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |   for (int i = r.size(); i < b.size(); i++){
      |                          ~~^~~~~~~~~~
wiring.cpp: In function 'long long int min_total_length(std::vector<int>, std::vector<int>)':
wiring.cpp:57:1: warning: control reaches end of non-void function [-Wreturn-type]
   57 | }
      | ^

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