OJ-Problems-Source/HDOJ/4598_autoAC.cpp

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#include<iostream>
#include<cstdio>
#include<string>
#include<cstring>
#include<cmath>
#include<algorithm>
#include<queue>
#include<stack>
#include<vector>
#include<climits>
#include<map>
using namespace std;
#define rep(i,n) for(int i=0; i<n; i++)
#define repf(i,n,m) for(int i=(n); i<=(m); ++i)
#define repd(i,n,m) for(int i=(n); i>=(m); --i)
#define ll long long
#define arc(a) ((a)*(a))
#define inf 10000000
#define exp 0.000001
#define N 305
#define T 400
int cont[N];
struct node
{
int y,w,pre;
};
node a[N*N];
int pre[N];
int color[N];
bool vis[N];
int dp[N];
char s[N][N];
int n,len;
bool dfs(int x)
{
color[x]=0;
queue<int>q; q.push(x);
while(!q.empty())
{
int x=q.front(); q.pop();
rep(i,n)
if(s[x][i]=='1')
if(color[i]==-1)
color[i]=color[x]^1,q.push(i);
else if(color[i]==color[x])
return false;
}
return true;
}
void init()
{
memset(color,-1,sizeof(color));
len=1;
memset(pre,-1,sizeof(pre));
rep(i,n) dp[i]=inf;
memset(cont,0,sizeof(cont));
memset(vis,false,sizeof(vis));
}
void addpage(int s,int t,int w)
{
a[len].y=t;
a[len].w=w;
a[len].pre=pre[s];
pre[s]=len++;
}
bool spfa()
{
queue<int>q;
q.push(0);
vis[0]=true; dp[0]=0;
while(!q.empty())
{
int x=q.front(); q.pop(); vis[x]=false;
for(int i=pre[x]; i!=-1; i=a[i].pre)
{
int y=a[i].y;
if(dp[x]+a[i].w<dp[y])
{
dp[y]=dp[x]+a[i].w;
if(vis[y]==false)
{
q.push(y);
vis[y]=true;
cont[y]++;
if(cont[y]>n)
return false;
}
}
}
}
return true;
}
bool solve()
{
init();
rep(i,n)
if(color[i]==-1)
if(!dfs(i))
return false;
rep(i,n)
repf(j,i+1,n-1)
{
if(s[i][j]=='0')
if(color[i]==0)
addpage(j,i,T-1);
else
addpage(i,j,T-1);
else
if(color[i]==0)
addpage(i,j,-T);
else addpage(j,i,-T);
}
return spfa();
}
int main()
{
int test;
scanf("%d",&test);
while(test--)
{
scanf("%d",&n);
rep(i,n) scanf("%s",s[i]);
if(solve())
printf("Yes\n");
else
printf("No\n");
}
return 0;
}