#include <bits/stdc++.h>
using namespace std;
const int maxn = 1e5 + 10;
char c[maxn][maxn];
int d[maxn][maxn];
int dx[] = {-1,1,0,0};
int dy[] = {0,0,-1,1};
bool vis[maxn][maxn];
int n,m;
bool check(int x,int y){
return (x >= 1 && x <= n && y >= 1 && y <= m && c[x][y] != '.' && !vis[x][y]);
}
void bfs(){
vis[1][1] = true;
int ans = 0;
deque<pair<int,int>> q;
q.push_front({1,1});
d[1][1] = 1;
while(!q.empty()){
pair<int,int> u = q.front();
q.pop_front();
ans = max(ans,d[u.first][u.second]);
for(int k = 0 ; k < 4; k++){
int xx = u.first + dx[k];
int yy = u.second + dy[k];
if(check(xx,yy)){
if(c[u.first][u.second] == c[xx][yy]){
vis[xx][yy] = true;
d[xx][yy] = d[u.first][u.second];
q.push_front({xx,yy});
}
else {
vis[xx][yy] = true;
d[xx][yy] = d[u.first][u.second] + 1;
q.push_back({xx,yy});
}
}
}
}
cout << ans << endl;
}
int main(){
cin >> n >> m;
for(int i =1; i<= n ;i++){
for(int j = 1 ; j <= m ;j ++) cin >> c[i][j];
}
bfs();
}
컴파일 시 표준 에러 (stderr) 메시지
/tmp/cceO5hzq.o: in function `check(int, int)':
tracks.cpp:(.text+0x30): relocation truncated to fit: R_X86_64_PC32 against symbol `c' defined in .bss section in /tmp/cceO5hzq.o
/tmp/cceO5hzq.o: in function `bfs()':
tracks.cpp:(.text+0x185): relocation truncated to fit: R_X86_64_PC32 against symbol `d' defined in .bss section in /tmp/cceO5hzq.o
tracks.cpp:(.text+0x1c6): relocation truncated to fit: R_X86_64_PC32 against symbol `d' defined in .bss section in /tmp/cceO5hzq.o
tracks.cpp:(.text+0x207): relocation truncated to fit: R_X86_64_PC32 against symbol `c' defined in .bss section in /tmp/cceO5hzq.o
tracks.cpp:(.text+0x239): relocation truncated to fit: R_X86_64_PC32 against symbol `d' defined in .bss section in /tmp/cceO5hzq.o
tracks.cpp:(.text+0x24a): relocation truncated to fit: R_X86_64_PC32 against symbol `c' defined in .bss section in /tmp/cceO5hzq.o
tracks.cpp:(.text+0x28a): relocation truncated to fit: R_X86_64_PC32 against symbol `d' defined in .bss section in /tmp/cceO5hzq.o
tracks.cpp:(.text+0x2ee): relocation truncated to fit: R_X86_64_PC32 against symbol `std::cout' defined in .bss._ZSt4cout section in /usr/lib/gcc/x86_64-linux-gnu/11/libstdc++.a(globals_io.o)
tracks.cpp:(.text+0x382): relocation truncated to fit: R_X86_64_PC32 against symbol `d' defined in .bss section in /tmp/cceO5hzq.o
/tmp/cceO5hzq.o: in function `main':
tracks.cpp:(.text.startup+0x16): relocation truncated to fit: R_X86_64_PC32 against symbol `std::cin' defined in .bss._ZSt3cin section in /usr/lib/gcc/x86_64-linux-gnu/11/libstdc++.a(globals_io.o)
tracks.cpp:(.text.startup+0x44): additional relocation overflows omitted from the output
/usr/lib/gcc/x86_64-linux-gnu/11/libstdc++.a(ios_init.o): in function `std::ios_base::Init::Init()':
(.text._ZNSt8ios_base4InitC2Ev+0x1c): failed to convert GOTPCREL relocation against '_ZNSt8ios_base4Init11_S_refcountE'; relink with --no-relax
(.text._ZNSt8ios_base4InitC2Ev+0x1c6): failed to convert GOTPCREL relocation against '_ZSt4cout'; relink with --no-relax
(.text._ZNSt8ios_base4InitC2Ev+0x260): failed to convert GOTPCREL relocation against '_ZSt3cin'; relink with --no-relax
(.text._ZNSt8ios_base4InitC2Ev+0x2e2): failed to convert GOTPCREL relocation against '_ZSt4cerr'; relink with --no-relax
(.text._ZNSt8ios_base4InitC2Ev+0x353): failed to convert GOTPCREL relocation against '_ZSt4clog'; relink with --no-relax
(.text._ZNSt8ios_base4InitC2Ev+0x541): failed to convert GOTPCREL relocation against '_ZSt5wcout'; relink with --no-relax
(.text._ZNSt8ios_base4InitC2Ev+0x5e5): failed to convert GOTPCREL relocation against '_ZSt4wcin'; relink with --no-relax
(.text._ZNSt8ios_base4InitC2Ev+0x670): failed to convert GOTPCREL relocation against '_ZSt5wcerr'; relink with --no-relax
(.text._ZNSt8ios_base4InitC2Ev+0x6e9): failed to convert GOTPCREL relocation against '_ZSt5wclog'; relink with --no-relax
/usr/bin/ld: final link failed
collect2: error: ld returned 1 exit status
