http://poj.org/problem?id=3984 #include <iostream> using namespace std; const int M=2147483647; int b[5][5]; void calc(int a[][5],int i,int j); void print(int i,int j); int main() { int i,j; int a[5][5]; for(i=0;i<=4;i++) for(j=0;j<=4;j++) { cin>>a[i][j]; if(a[i][j]==1) a[i][j]=M; } calc(a,0,0); print(4,4); return 0; } void calc(int a[][5],int i,int j) { int indexX[4]={-1,0,0,1}; int indexY[4]={0,-1,1,0}; if(a[i][j]==M) return; for(int ii=0;ii<=3;ii++) { int s=i+indexX[ii]; int t=j+indexY[ii]; if(a[s][t]!=M&&0<=s&&s<=4&&0<=t&&t<=4) { int temp=a[i][j]+1; if(temp<a[s][t]||a[s][t]==0) { a[s][t]=temp; b[s][t]=i*5+j; calc(a,s,t); } } } return; } void print(int i,int j) { if(i==0&&j==0) {cout<<"(0, 0)"<<endl; return;} print(b[i][j]/5,b[i][j]%5); cout<<"("<<i<<", "<<j<<")"<<endl; }
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