Submission #60760

#	Time	Username	Problem	Language	Result	Execution time	Memory
60760		KLPP	Shortcut (IOI16_shortcut)	C++14	0 / 100	30 ms	24064 KiB

shortcut

#include "shortcut.h"
#include<iostream>
#include<vector>
#include<queue>
using namespace std;
typedef long long int lld;
typedef pair<int,long long int> pii;

vector<pii>nei[1000000];
lld max(lld x, lld y){
	if(x<y)return y;
return x;
	
}
lld min(lld x, lld y){
	if(x>y)return y;
return x;
	
}
int diameter(vector<pii>graph[],int n){
	lld ans=0;
	for(int i=0;i<n;i++){
		queue<pii>q;
		lld dist[n];
		for(int j=0;j<n;j++)dist[j]=-1;
		dist[i]=0;
		q.push(pii(i,0));
		int it=0;
		while(!q.empty()){//it++;
			int node=q.front().first;
			lld d=q.front().second;
			//cout<<node<<" "<<d<<endl;
			q.pop();
			if(d>dist[node] && dist[node]!=-1)continue;
			for(int j=0;j<graph[node].size();j++){
				int v=graph[node][j].first;
				if(dist[v]==-1 || dist[v]>graph[node][j].second+d){
					dist[v]=graph[node][j].second+d;
					q.push(pii(v,dist[v]));
				}
			}
		}
		for(int j=0;j<n;j++){
			//cout<<dist[j]<<" ";
			ans=max(ans,dist[j]);
		}//cout<<endl;
	}return ans;
}
long long find_shortcut(int n, std::vector<int> l, std::vector<int> d, int c)
{
	for(int i=0;i<n;i++){
		nei[i+n].push_back(pii(i,d[i]));
		nei[i].push_back(pii(i+n,d[i]));
	}
	for(int i=0;i<n-1;i++){
		nei[i].push_back(pii(i+1,l[i]));
		nei[i+1].push_back(pii(i,l[i]));
	}
	lld ans=1000000000000000000;
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++){
			vector<pii> graph[2*n];
			for(int k=0;k<2*n;k++){
				for(int u=0;u<nei[k].size();u++){
					graph[k].push_back(nei[k][u]);
				}
			}
			graph[i].push_back(pii(j,c));
			graph[j].push_back(pii(i,c));
			ans=min(ans,diameter(graph,2*n));
			//cout<<diameter(graph,2*n)<<" "<<i<<" "<<j<<endl;
		}
	}
	ans=min(ans,diameter(nei,2*n));
	//cout<<diameter(nei,2*n)<<endl;
	return ans;
}

Compilation message (stderr)

shortcut.cpp: In function 'int diameter(std::vector<std::pair<int, long long int> >*, int)':
shortcut.cpp:35:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int j=0;j<graph[node].size();j++){
                ~^~~~~~~~~~~~~~~~~~~
shortcut.cpp:28:7: warning: unused variable 'it' [-Wunused-variable]
   int it=0;
       ^~
shortcut.cpp: In function 'long long int find_shortcut(int, std::vector<int>, std::vector<int>, int)':
shortcut.cpp:64:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int u=0;u<nei[k].size();u++){
                 ~^~~~~~~~~~~~~~

• Subtask 1: 0 / 9
• Subtask 2: 0 / 14
• Subtask 3: 0 / 8
• Subtask 4: 0 / 7
• Subtask 5: 0 / 33
• Subtask 6: 0 / 22
• Subtask 7: 0 / 4
• Subtask 8: 0 / 3