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83 lines (82 loc) · 2.31 KB
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Copy pathEllysViewPoints.cpp
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83 lines (82 loc) · 2.31 KB
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#include<bits/stdc++.h>
using namespace std;
class EllysViewPoints{
public:
int getCount(int N, int M, vector <string> s){
vector<vector<int> >U(N,vector<int>(M,0));
vector<vector<int> >D(N,vector<int>(M,0));
vector<vector<int> >L(N,vector<int>(M,0));
vector<vector<int> >R(N,vector<int>(M,0));
int ans=0;
for(int i=0;i<N;i++){
for(int j=0;j<M;j++){
if(i==0 && s[i][j]=='.'){
U[i][j]=1;
}
else{
if(s[i][j]=='.'){
if(s[i-1][j]=='.' && U[i-1][j]==1){
U[i][j]=1;
}
}
}
}
}
for(int i=N-1;i>=0;i--){
for(int j=0;j<M;j++){
if(i==N-1){
if(s[i][j]=='.'){
D[i][j]=1;
}
}
else{
if(s[i][j]=='.'){
if(s[i+1][j]=='.' && D[i+1][j]==1){
D[i][j]=1;
}
}
}
}
}
for(int i=0;i<N;i++){
for(int j=0;j<M;j++){
if(j==0){
if(s[i][j]=='.'){
L[i][j]=1;
}
}
else{
if(s[i][j]=='.'){
if(s[i][j-1]=='.' && L[i][j-1]==1){
L[i][j]=1;
}
}
}
}
}
for(int i=0;i<N;i++){
for(int j=M-1;j>=0;j--){
if(j==M-1){
if(s[i][j]=='.'){
R[i][j]=1;
}
}
else{
if(s[i][j]=='.'){
if(s[i][j+1]=='.' && R[i][j+1]==1){
R[i][j]=1;
}
}
}
}
}
for(int i=0;i<N;i++){
for(int j=0;j<M;j++){
if(L[i][j]==1 && R[i][j]==1 && U[i][j]==1 && D[i][j]==1){
ans++;
}
}
}
return ans;
}
};