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WalkingHome.cpp
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#include <iostream>
#include <sstream>
#include <vector>
#include <algorithm>
#include <set>
#include <map>
#include <queue>
#include <cstdio>
using namespace std;
class WalkingHome
{
public:
typedef pair<int, int> pi;
void msearch(vector<string> M, pi p, int level, int nval[51][51]){
int n = M.size(), m = M[0].size();
queue<pi> Q;
Q.push(p);
nval[p.first][p.second] = level;
while(!Q.empty()){
pi q = Q.front();
Q.pop();
int x = q.first, y = q.second;
if(0 <= x && x < n && 0 <= y && y < m && (M[x][y] == '.' || M[x][y] == 'S' || M[x][y] == 'H')){
nval[x][y] = level;
M[x][y] = 'x';
Q.push(make_pair(x+1, y));
Q.push(make_pair(x-1, y));
Q.push(make_pair(x, y+1));
Q.push(make_pair(x, y-1));
}
}
print(M);
}
int fewestCrossings(vector <string> M)
{
int val;
// cin>>val;
int nval[51][51];
pi S, H;
pi seed[255];
int n = M.size(), m = M[0].size();
for(int i = 0; i < n; i++)
for(int j = 0; j < m; j++)
nval[i][j] = -1;
int c = 0;
print(M);
for(int i = 0; i < n; i++)
for(int j = 0; j < m; j++)
{
if(M[i][j] == 'S'){
S = make_pair(i, j);
if(nval[i][j] == -1){
seed[c] = S;
msearch(M, S, c++, nval);
}
}
else if(M[i][j] == 'H'){
H = make_pair(i, j);
if(nval[i][j] == -1){
seed[c] = H;
msearch(M, H, c++, nval);
}
}
else if(M[i][j] == '.' && nval[i][j] == -1){
seed[c] = make_pair(i, j);
msearch(M, make_pair(i, j), c++, nval);
}
}
for(int i = 0; i < n; i++){
for(int j = 0; j < m; j++)
printf("%3d ", nval[i][j]);
cout<<endl;
}
cout<<endl;
int src = nval[S.first][S.second], dest = nval[H.first][H.second];
cout<<"src = "<<src<<" dest = "<<dest<<endl;
if(nval[S.first][S.second] == nval[H.first][H.second]) return 0;
// bool visited[255];
int level[1000];
int adj[1000][1000];
fill(level, level+1000, -1);
for(int i = 0; i <= c; i++)
for(int j = 0; j <= c; j++)
adj[i][j] = 0;
//sweeping row-wise
for(int i = 0; i < n; i++){
vector<int> v;
for(int j = 0; j < m; j++)
if(M[i][j] != '|') v.push_back(nval[i][j]);
for(int k = 1; k < v.size(); k++){
while(k < v.size() && (v[k] == -1 || v[k-1] == -1 || v[k] == v[k-1])) k++;
if(k < v.size()) adj[v[k]][v[k-1]] = adj[v[k-1]][v[k]] = 1;
}
}
//sweeping column-wise
for(int j = 0; j < m; j++){
vector<int> v;
for(int i = 0; i < n; i++)
if(M[i][j] != '-') v.push_back(nval[i][j]);
for(int k = 1; k < v.size(); k++){
while(k < v.size() && (v[k] == -1 || v[k-1] == -1 || v[k] == v[k-1])) k++;
if(k < v.size()) adj[v[k]][v[k-1]] = adj[v[k-1]][v[k]] = 1;
}
}
for(int i = 0; i <= c; i++)
for(int j = i+1; j <= c; j++)
if(adj[i][j] == 1) cout<<i<<" "<<j<<endl;
cout<<endl;
if(adj[nval[S.first][S.second]][nval[H.first][H.second]] == 1) return 1;
queue<int> Q;
Q.push(src);
int visited[1000];
fill(visited, visited+1000, -1);
visited[src] = 0;
while(!Q.empty()){
int p = Q.front();
Q.pop();
cout<<p<<" visited at level "<<visited[p]<<endl;
if(p == dest) return visited[dest];
for(int j = 0; j <= c; j++)
if(adj[p][j] == 1 && visited[j] == -1){
Q.push(j);
visited[j] = visited[p]+1;
}
}
return -1;
}
void print(vector<string> v){
int n = v.size();
int m = v[0].size();
for(int i = 0; i < n; i++){
for(int j = 0; j < m; j++)
cout<<v[i][j];
cout<<endl;
}
cout<<endl;
}
// BEGIN CUT HERE
public:
void run_test(int Case) { if ((Case == -1) || (Case == 0)) test_case_0(); if ((Case == -1) || (Case == 1)) test_case_1(); if ((Case == -1) || (Case == 2)) test_case_2(); if ((Case == -1) || (Case == 3)) test_case_3(); if ((Case == -1) || (Case == 4)) test_case_4(); if ((Case == -1) || (Case == 5)) test_case_5(); if ((Case == -1) || (Case == 6)) test_case_6(); }
private:
template <typename T> string print_array(const vector<T> &V) { ostringstream os; os << "{ "; for (typename vector<T>::const_iterator iter = V.begin(); iter != V.end(); ++iter) os << '\"' << *iter << "\","; os << " }"; return os.str(); }
void verify_case(int Case, const int &Expected, const int &Received) { cerr << "Test Case #" << Case << "..."; if (Expected == Received) cerr << "PASSED" << endl; else { cerr << "FAILED" << endl; cerr << "\tExpected: \"" << Expected << '\"' << endl; cerr << "\tReceived: \"" << Received << '\"' << endl; } }
void test_case_0() { string Arr0[] = {"--------*-*-*----*-------*--*--------", "...FFFFF|F|F|FFFFH.......|..|........", ".......F..S......|..F.......|........"}; vector <string> Arg0(Arr0, Arr0 + (sizeof(Arr0) / sizeof(Arr0[0]))); int Arg1 = 1; verify_case(0, Arg1, fewestCrossings(Arg0)); }
void test_case_1() { string Arr0[] = {"S.|..",
"..|.H",
"..|..",
"....."}; vector <string> Arg0(Arr0, Arr0 + (sizeof(Arr0) / sizeof(Arr0[0]))); int Arg1 = 0; verify_case(1, Arg1, fewestCrossings(Arg0)); }
void test_case_2() { string Arr0[] = {"S.||...",
"..||...",
"..||...",
"..||..H"}; vector <string> Arg0(Arr0, Arr0 + (sizeof(Arr0) / sizeof(Arr0[0]))); int Arg1 = 1; verify_case(2, Arg1, fewestCrossings(Arg0)); }
void test_case_3() { string Arr0[] = {"S|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.||.", "*************************************************-", ".||.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.", "-*************************************************", ".|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.||.", "*************************************************-", ".||.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.", "-*************************************************", ".|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.||.", "*************************************************-", ".||.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.", "-*************************************************", ".|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.||.", "*************************************************-", ".||.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.", "-*************************************************", ".|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.||.", "*************************************************-", ".||.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.", "-*************************************************", ".|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.||.", "*************************************************-", ".||.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.", "-*************************************************", ".|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.||.", "*************************************************-", ".||.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.", "-*************************************************", ".|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.||.", "*************************************************-", ".||.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.", "-*************************************************", ".|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.||.", "*************************************************-", ".||.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.", "-*************************************************", ".|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.||.", "*************************************************-", ".||.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.", "-*************************************************", ".|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.||.", "*************************************************-", ".||.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.", "-*************************************************", ".|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.||.", "*************************************************-", ".||.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.", "-*************************************************", ".|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.||.", ".|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.||H"}; vector <string> Arg0(Arr0, Arr0 + (sizeof(Arr0) / sizeof(Arr0[0]))); int Arg1 = 624; verify_case(3, Arg1, fewestCrossings(Arg0)); }
void test_case_4() { string Arr0[] = {"S.F..",
"..F..",
"--*--",
"..|..",
"..|.H"}; vector <string> Arg0(Arr0, Arr0 + (sizeof(Arr0) / sizeof(Arr0[0]))); int Arg1 = 2; verify_case(4, Arg1, fewestCrossings(Arg0)); }
void test_case_5() { string Arr0[] = {"H|.|.|.|.|.|.|.|.|.|.|.|.|.",
"F|F|F|F|F|F|F|F|F|F|F|F|F|-",
"S|.|.|.|.|.|.|.|.|.|.|.|.|."}; vector <string> Arg0(Arr0, Arr0 + (sizeof(Arr0) / sizeof(Arr0[0]))); int Arg1 = 27; verify_case(5, Arg1, fewestCrossings(Arg0)); }
void test_case_6() { string Arr0[] = {"S-H"}; vector <string> Arg0(Arr0, Arr0 + (sizeof(Arr0) / sizeof(Arr0[0]))); int Arg1 = -1; verify_case(6, Arg1, fewestCrossings(Arg0)); }
// END CUT HERE
};
// BEGIN CUT HERE
int main()
{
WalkingHome ___test;
___test.run_test(3);
}
// END CUT HERE