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| #include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <algorithm>
#include <sstream>
#include <map>
#include <set>
#define REP(i,k,n) for(int i=k;i<n;i++)
#define rep(i,n) for(int i=0;i<n;i++)
#define INF 1<<30
#define pb push_back
#define mp make_pair
using namespace std;
typedef long long ll;
typedef pair<int,int> P;
int h, w, n;
int sx,sy,gx,gy;
int dx[4] = {1,-1, 0, 0};
int dy[4] = {0, 0, 1,-1};
vector<string> s;
bool used[35][35], used2[35][35];
bool can(int y,int x) {
if(0 <= y && y < h && 0 <= x && x < w) return true;
return false;
}
bool func(vector<string> t) {
for(int i = h - 1; i >= 0; i--) {
for(int j = w - 1; j >= 0; j--) {
if(t[i][j] == '.') continue;
int k = i;
while(can(k+1, j) && t[k+1][j] == '.') {
swap(t[k][j], t[k+1][j]);
k++;
}
}
}
while(true) {
bool flag = false;
memset(used, 0, sizeof(used));
memset(used2, 0, sizeof(used2));
for(int i = h-1; i >= 0; i--) {
for(int j = w-1; j >= 0; j--) {
if(t[i][j] == '.') continue;
if(!used[i][j]) {
int len = 1;
int k = j+1;
while(can(i, k) && t[i][k] == t[i][j]) {
len++;
k++;
}
k = j-1;
while(can(i, k) && t[i][k] == t[i][j]) {
len++;
k--;
}
if(len >= n) {
flag = true;
used[i][j] = true;
k = j + 1;
while(can(i, k) && t[i][k] == t[i][j]) {
used[i][k] = true;
k++;
}
k = j - 1;
while(can(i, k) && t[i][k] == t[i][j]) {
used[i][k] = true;
k--;
}
}
}
if(!used2[i][j]) {
int len = 1;
int k = i + 1;
while(can(k, j) && t[k][j] == t[i][j]) {
len++;
k++;
}
k = i - 1;
while(can(k, j) && t[k][j] == t[i][j]) {
len++;
k--;
}
if(len >= n) {
flag = true;
used2[i][j] = true;
k = i + 1;
while(can(k, j) && t[k][j] == t[i][j]) {
used2[k][j] = true;
k++;
}
k = i - 1;
while(can(k, j) && t[k][j] == t[i][j]) {
used2[k][j];
k++;
}
}
}
}
}
rep(i, h) {
rep(j, w) {
if(used[i][j] || used2[i][j]) t[i][j] = '.';
}
}
for(int i = h - 1; i >= 0; i--) {
for(int j = w - 1; j >= 0; j--) {
if(t[i][j] == '.') continue;
int k = i;
while(can(k+1, j) && t[k+1][j] == '.') {
swap(t[k][j], t[k+1][j]);
k++;
}
}
}
if(flag) continue;
else break;
}
rep(i, h) {
rep(j, w) {
if(t[i][j] == '.') continue;
return false;
}
}
return true;
}
int main() {
cin >> h >> w >> n;
s.resize(h);
rep(i, h) cin >> s[i];
bool flag = false;
rep(i, h) {
rep(j, w) {
if(s[i][j] == '.') continue;
if(j == 0) {
swap(s[i][j], s[i][j+1]);
flag |= func(s);
swap(s[i][j], s[i][j+1]);
} else if(j == w-1) {
swap(s[i][j], s[i][j-1]);
flag |= func(s);
swap(s[i][j], s[i][j-1]);
} else {
swap(s[i][j], s[i][j+1]);
flag |= func(s);
swap(s[i][j], s[i][j+1]);
swap(s[i][j], s[i][j-1]);
flag |= func(s);
swap(s[i][j], s[i][j-1]);
}
}
}
if(flag) cout << "YES" << endl;
else cout << "NO" << endl;
return 0;
}
|