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Update 3562_unfinished.cpp

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Kirigaya Kazuto 2016-10-12 10:20:59 +08:00 committed by GitHub
parent 91d68a4520
commit 197b491f4e
1 changed files with 22 additions and 26 deletions
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46
SDUTOJ/3562_unfinished.cpp
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@ -6,22 +6,23 @@ using namespace std;
#define INF 0x3f3f3f3f
/** SPFA 单源最短路径算法 不支持负环*/
const int MAXN = 1005;
#define MAXN 1005;
int d[MAXN];/// distance [ From S to ... ]
int v[MAXN];/// visit
bool v[MAXN];/// visit
int q[MAXN];/// 基于数组的队列(也可用queue等...)
int mp[MAXN][MAXN]; /// mp[i][j] i<--> j is connected.
int n;/// n is the number of max Point .
int n,m;/// n is the number of max Point .
int path[MAXN];
void spfa(int StartPoint) /// d[i] is the min distance from StartPoint to i ( Both >=1 )
{
memset(d,0x3f,sizeof(int)*(n+1));
memset(v,0,sizeof(int)*(n+1));
/*
for(int i=1;i<MAXN;i++)
d[i]=INF,v[i]=0;*/
for(int i=0; i<=n; i++)
{
if(mp[0][i]!=INF)path[i]=i;//Path Init
d[i]=INF;
v[i]=0;
}
int cnt=0;
q[cnt++]=StartPoint;
v[StartPoint]=1;
@ -29,25 +30,26 @@ void spfa(int StartPoint) /// d[i] is the min distance from StartPoint to i ( Bo
while(cnt>0)
{
int c=q[--cnt];
v[c]=0;
//v[c]=0;
for(int i=0;i<=n;i++)
{
/// Here : if your mp[i][j] use INF as infinite, then use mp[c][i]!=INF.
/// Or you may use mp[i][j]!=-1 && d[i] > d[c] + mp[c][i]
if( mp[c][i]!=INF && d[i]>d[c]+mp[c][i] )
if( d[i]>d[c]+mp[c][i] )
{
d[i]=d[c]+mp[c][i];
//path[i]=min(path[i],path[c]);
if(!v[i])
{
if(c) path[i]=path[c];
v[i]=1,q[cnt++]=i;
v[i]==1;
q[cnt++]=i;
}
}
if(c&&d[i]==d[c]+mp[c][i])
if(d[i]==d[c]+mp[c][i])
{
path[i]=min(path[i],path[c]);
if(c)path[i]=min(path[i],path[c]);
}
}
}
@ -59,29 +61,23 @@ int main()
scanf("%d",&t);
while(t--)
{
int m;
scanf("%d%d",&n,&m);
if(!n&&!m) break;
n=n+1;
for(int i=0;i<=n;i++)
for(int i=0;i<=n;++i)
{
for(int j=0;j<=n;j++)
for(int j=0;j<=i;++j)
{
if(i==j) mp[i][j]=0;
else mp[i][j]=INF;
else mp[i][j]=mp[j][i]=INF;
}
}
int tu,tv,tw;
for(int i=0;i<m;i++)
{
int u,v,w;
scanf("%d %d %d",&u,&v,&w);
mp[u][v]=w;
}
for(int i=0; i<=n; i++)
{
if(mp[0][i]!=INF)path[i]=i;//Path Init
scanf("%d%d%d",&tu,&tv,&tw);
mp[tu][tv]=tw;
}
spfa(0);