590 - Always on the run
Posted: Mon Jul 21, 2003 10:29 am
Can the problem-590 be solved by BFS?
If it can then how.
plz explain.
If it can then how.
plz explain.
Page 1 of 1
590 can you give me a tiny hint
Posted: Sun Nov 16, 2003 7:54 pm
Am I the only one who doesn't know how to do that one ??
Posted: Thu Aug 26, 2004 12:22 pm
I just finished it.
You may not consider it as a graph problem.
Just for each day calculate the min cost from paris to other cities.
Surely you can get min cost from paris after first day.
Then for the second day from the results we just calculate it's easy to get the min cost for every city after two days travel.
the third day
the fourth day
....
the kth day
The min cost to nth city after kth day is the answer.
You may not consider it as a graph problem.
Just for each day calculate the min cost from paris to other cities.
Surely you can get min cost from paris after first day.
Then for the second day from the results we just calculate it's easy to get the min cost for every city after two days travel.
the third day
the fourth day
....
the kth day
The min cost to nth city after kth day is the answer.
Posted: Sun Apr 09, 2006 12:54 am
It can be solved using bfs.
The idea is simple.
Hope it helps.
The idea is simple.
Code: Select all
for i = 1 to n // n total places
for d = 1 to day // day total days
val[i][d] = inf
set val[1][0] = 0, because in 0-th day she is in the 1st place. And the cost is zero.
1. enque(1, 0)
2. u = deque()
3. for i = 1 to n and i is different from u.n
4. v.n = i and v.day = u.day+1
5. if(there is a flight in the u.day-th day from u.n to v.n)
6. if(val[v.n][v.day] > val[u.n][u.day] + flight cost)
7. update val[v.n][v.day] and enque(v)
8. if the queue is not empty then goto step 2
then the val[n][day] will contain the minimum cost.Posted: Sun Apr 09, 2006 1:01 am
You can also solve it using bfs.
Re: 590 can you give me a tiny hint
Posted: Mon Sep 15, 2008 11:37 pm
I solved this problem using recursion with memoization. But I am getting WA.
Here is my recursive function,
Here is my recursive function,
Code: Select all
int n,k;
vector<int> D[11][11]; //D[city1][city2][day]
long long dp[11][31]; //dp[city][day]
long long solve(int city,int day)
{
if(day==k){
if(city==n) return 0;
return INF;
}
long long& res=dp[city][day];
if(res!=-1) return res;
res=INF;
for(int i=1;i<=n;i++)
{
if(city==i) continue;
int sz=D[city][i].size();
if(D[city][i][day%sz]!=0) res=min(res,D[city][i][day%sz]+solve(i,day+1));
}
return res;
}Re: 590 can you give me a tiny hint
Posted: Tue Sep 20, 2011 8:39 pm
To:bourne
If You didn't get it accepted yet ..then it's for u...
If You didn't get it accepted yet ..then it's for u...
day could be as large as 1000 ..so you should increase size of 2nd dimension of your array..I was also getting WA for this reason..long long dp[11][31]; //dp[city][day]
Re: 590 can you give me a tiny hint
Posted: Wed Nov 06, 2013 12:13 am
Re: 590 can you give me a tiny hint
Posted: Wed Nov 06, 2013 9:47 pm
Print a blank line after each scenario, including the last one.
Re: 590 can you give me a tiny hint
Posted: Wed Nov 06, 2013 9:56 pm
Thanks brianfry713 I got AC now.
Re: 590 - Always on the run
Posted: Thu Feb 26, 2015 10:45 pm
Any one help with small push in right direction, im getting WA
Code: Select all
ACRe: 590 - Always on the run
Posted: Tue May 05, 2015 1:30 pm
WHY WA ???
Code: Select all
#include <bits/stdc++.h>
using namespace std;
/*------- Constants---- */
#define LMT 12
#define ll long long
#define ull unsigned long long
#define mod 1000000007
#define MEMSET_INF 63
#define MEM_VAL 1061109567
#define FOR(i,n) for( int i=0 ; i < n ; i++ )
#define mp(i,j) make_pair(i,j)
#define lop(i,a,b) for( int i = (a) ; i < (b) ; i++)
#define pb(a) push_back((a))
#define gc getchar_unlocked
#define PI acos(-1.0)
#define inf 1<<28
#define lc ((n)<<1)
#define rc ((n)<<1 |1)
#define msg(x) cout<<x<<endl;
#define EPS 1e-7
/*---- short Cuts ------- */
#define ms(ara_name,value) memset(ara_name,value,sizeof(ara_name))
typedef pair<int, int> ii;
typedef vector<int > vi ;
/*------ template functions ------ */
inline void sc(int &x)
{
register int c = gc();
x = 0;
int neg = 0;
for(;((c<48 | c>57) && c != '-');c = gc());
if(c=='-') {neg=1;c=gc();}
for(;c>47 && c<58;c = gc()) {x = (x<<1) + (x<<3) + c - 48;}
if(neg) x=-x;
}
template <class T> inline T bigmod(T p,T e,T M){
ll ret = 1;
for(; e > 0; e >>= 1){
if(e & 1) ret = (ret * p) % M;
p = (p * p) % M;
} return (T)ret;
}
template <class T> inline T gcd(T a,T b){if(b==0)return a;return gcd(b,a%b);}
template <class T> inline T modinverse(T a,T M){return bigmod(a,M-2,M);}
/*************************** END OF TEMPLATE ****************************/
int N , K ;
int cost[LMT][LMT][1005];
bool flag = false;
int dp[LMT][1005];
int var[LMT];
int cal(int n,int day)
{
if( day >= K ){
if( n == N ) {
flag = true;
return 0;
}
else return inf ;
}
if(dp[n][day] !=-1 ) return dp[n][day];
int t = inf ;
for(int i = 1; i <= N ; i ++ ) {
if(i != n ) {
if(cost[n][i][day % var[n]] !=0 ) {
t = min (t , cost[n][i][day % var[n] ] + cal(i, day + 1) );
}
}
}
return dp[n][day] = t;
}
int main()
{
int cs = 0 , p ;
while (1) {
sc(N);sc(K);
if(N == 0 && K == 0 ) break;
ms(cost, 0);
for(int i = 1 ; i <= N ; i ++ ) {
for(int j = 1; j <= N ; j ++ ) {
if( i == j ) continue;
sc(p);
var[i] = p;
for(int l = 0 ; l < p ; l ++ ) {
sc(cost[i][j][l]);
}
}
}
ms(dp, -1);
flag = false;
int p = cal(1 , 0);
printf("Scenario #%d\n",++cs);
if(flag ){
printf("The best flight costs %d.\n",p);
}
else printf("No flight possible.\n");
printf("\n");
}
return 0;
}
Sinikar, Uruk, Goran and Kan Falkland islands (malvinas)
Posted: Sat Dec 31, 2016 1:30 am
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