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插头 DP code1-2
source link: http://abcdxyzk.github.io/blog/2011/03/20/alg-mdp-source1/
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插头 DP code1-2
2011-03-20 23:00:00
一、hdu_1964
#include<stdio.h>
#include<string.h>
#include<map>
int n,m,up[33][33],le[33][33];
int dp[200000],pre[200000],val[33],LL,UU,sta,next;
int a[33],b[33],d[33],c[33];
char p[200000][12];
int ok()
{
int i,l;
l = 0;
for(i=1;i<=m+1;i++)
{
b[i] = d[i] = -1;
if(a[i] == 1) c[++l] = i;
else
if(a[i] == 2)
{
if(l == 0) return 0;
b[c[l]] = i; d[i] = c[l];
l--;
}
}
if(l != 0) return 0;
return 1;
}
void init()
{
int i,j,k;
val[1] = 1;
for(i=2;i<=12;i++) val[i] = val[i-1]*3;
for(i=0;i<=12;i++) a[i] = 0;
a[1] = -1;
for(i=0;i<=val[m+2];i++)
{
a[1]++;
k = 1; while(k <= m+1 && a[k]>2) { a[k]%=3; a[k+1]++; k++; }
if(ok() == 0) continue;
for(j=1;j<=m+1;j++) {
p[i][j] = -1;
if(b[j] != -1) p[i][j] = b[j];
if(d[j] != -1) p[i][j] = d[j];
}
}
}
void abc()
{
int i,j,k,ans = 1000000;
for(i=0;i<=val[m+2];i++) dp[i] = 1000000;
dp[0] = 0;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{
if(j == 1)
{
for(k=val[m+2]-1;k>=0;k--)
{
dp[k] = dp[k/3];
if(k%3 != 0) dp[k] = 1000000;
}
}
for(k=0;k<val[m+2];k++)
{
pre[k] = dp[k]; dp[k] = 1000000;
}
for(k=0;k<val[m+2];k++)
if(pre[k] < 1000000)
{
LL = k/val[j]%3;
UU = k/val[j+1]%3;
if(UU == 0 && LL == 0)
{
sta = k+val[j]+val[j+1]+val[j+1];
next = pre[k]+le[i][j+1]+up[i+1][j];
if(dp[sta] > next) dp[sta] = next;
}
else
if(LL == 0)
{
sta = k;
next = pre[k]+le[i][j+1];
if(dp[sta] > next) dp[sta] = next;
sta = k+k/val[j+1]%3*(val[j]-val[j+1]);
next = pre[k]+up[i+1][j];
if(dp[sta] > next) dp[sta] = next;
}
else
if(UU == 0)
{
sta = k;
next = pre[k]+up[i+1][j];
if(dp[sta] > next) dp[sta] = next;
sta = k+k/val[j]%3*(-val[j]+val[j+1]);
next = pre[k]+le[i][j+1];
if(dp[sta] > next) dp[sta] = next;
}
else
if(LL == 2 && UU == 1)
{
sta = k-val[j]-val[j]-val[j+1];
next = pre[k];
if(dp[sta] > next) dp[sta] = next;
}
else
if(LL == 1 && UU == 1)
{
if(p[k][j+1] > 0 && p[k][j+1] <= m+1)
{
sta = k-val[j]-val[j+1]-val[p[k][j+1]];
next = pre[k];
if(dp[sta] > next) dp[sta] = next;
}
}
else
if(LL == 2 && UU == 2)
{
if(p[k][j] > 0)
{
sta = k-val[j]-val[j]-val[j+1]-val[j+1]+val[p[k][j]];
next = pre[k];
if(dp[sta] > next) dp[sta] = next;
}
}
else
if(LL == 1 && UU == 2)
{
if(i == n && j == m)
{
sta = k-val[j]-val[j+1]-val[j+1];
next = pre[k];
if(dp[sta] > next) dp[sta] = next;
if(dp[sta] < ans) ans = dp[sta];
}
}
}
}
printf("%d\n",ans);
}
int main()
{
int i,j,T;
char ch[1111];
scanf("%d",&T);
while(T--)
{
scanf("%d %d",&n,&m);
gets(ch);
gets(ch);
for(i=0;i<=n+1;i++) for(j=0;j<=m+1;j++) up[i][j] = le[i][j] = 1000000;
for(i=1;i<=n;i++)
{
gets(ch);
for(j=2;j<=m;j++) le[i][j] = ch[j+j-2]-48;
gets(ch);
if(i<n)
{
for(j=1;j<=m;j++) up[i+1][j] = ch[j+j-1]-48;
}
}
init();
abc();
}
return 0;
}二、timus_1519
#include<stdio.h>
long long dp[60000],pre[60000];
int all,r[60000],e[1600000];
int p[60000][13];
class DP {
public:
int n,m,can[33][33],last;
int val[33],LL,UU,sta,next;
int a[33],b[33],d[33],c[33];
void input()
{
int i,j;
char ch[15];
last = 0;
for(i=1;i<=n;i++)
{
scanf("%s",ch);
for(j=1;j<=m;j++)
{
can[i][j] = ch[j-1]=='.'?(++last):-1;
}
}
}
int ok()
{
int i,l;
l = 0;
for(i=1;i<=m+1;i++)
{
b[i] = d[i] = -1;
if(a[i] == 1) c[++l] = i;
else
if(a[i] == 2)
{
if(l == 0) return 0;
b[c[l]] = i; d[i] = c[l];
l--;
}
}
if(l != 0) return 0;
return 1;
}
void init()
{
int i,j,k;
val[1] = 1;
for(i=2;i<=m+2;i++) val[i] = val[i-1]*3;;
for(i=0;i<=m+2;i++) a[i] = 0;
a[1] = -1;
all = 0;
for(i=0;i<=val[m+2];i++)
{
a[1]++;
k = 1; while(k <= m+1 && a[k]>2) { a[k]%=3; a[k+1]++; k++; }
e[i] = -1;
if(ok() == 0) continue;
r[all] = i; e[i] = all;
for(j=1;j<=m+1;j++) {
p[all][j] = -1;
if(b[j] != -1) p[all][j] = b[j];
if(d[j] != -1) p[all][j] = d[j];
}
all++;
}
}
void abc()
{
int i,j,k,l;
input();
init();
for(i=0;i<all;i++) dp[i] = 0;
dp[r[0]] = 1;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{
if(j == 1)
{
for(k=all-1;k>=0;k--)
{
l = r[k]; l = l/3; l = e[l];
if(l != -1)
{
dp[k] = dp[l];
if(r[k]%3 != 0) dp[k] = 0;
}
else
dp[k] = 0;
}
}
for(k=0;k<all;k++)
{
pre[k] = dp[k]; dp[k] = 0;
}
for(k=0;k<all;k++)
if(pre[k] > 0)
{
LL = r[k]/val[j]%3;
UU = r[k]/val[j+1]%3;
if(can[i][j] == -1)
{
if(LL == 0 && UU == 0)
{
dp[k] += pre[k];
}
continue;
}
if(UU == 0 && LL == 0)
{
sta = r[k]+val[j]+val[j+1]+val[j+1];
dp[e[sta]] += pre[k];
}
else
if(LL == 0)
{
sta = r[k];
dp[e[sta]] += pre[k];
sta = r[k]+r[k]/val[j+1]%3*(val[j]-val[j+1]);
dp[e[sta]] += pre[k];
}
else
if(UU == 0)
{
sta = r[k];
dp[e[sta]] += pre[k];
sta = r[k]+r[k]/val[j]%3*(-val[j]+val[j+1]);
dp[e[sta]] += pre[k];
}
else
if(LL == 2 && UU == 1)
{
sta = r[k]-val[j]-val[j]-val[j+1];
dp[e[sta]] += pre[k];
}
else
if(LL == 1 && UU == 1)
{
if(p[k][j+1] > 0 && p[k][j+1] <= m+1)
{
sta = r[k]-val[j]-val[j+1]-val[p[k][j+1]];
dp[e[sta]] += pre[k];
}
}
else
if(LL == 2 && UU == 2)
{
if(p[k][j] > 0)
{
sta = r[k]-val[j]-val[j]-val[j+1]-val[j+1]+val[p[k][j]];
dp[e[sta]] += pre[k];
}
}
else
if(LL == 1 && UU == 2)
{
if(can[i][j] == last)
{
sta = r[k]-val[j]-val[j+1]-val[j+1];
dp[e[sta]] += pre[k];
}
}
}
}
printf("%lld\n",dp[r[0]]);
}
void solve()
{
while(scanf("%d %d",&n,&m) != EOF)
{
abc();
}
}
};
int main() {
DP dp;
dp.solve();
return 0;
}Recommend
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