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16A800· newbie2s64 MB⌨ stdin/stdout
#implementation

Examples

Sample 1of 3
Input
3 3
000
111
222
Output
YES
Sample 2of 3
Input
3 3
000
000
111
Output
NO
Sample 3of 3
Input
3 3
000
111
002
Output
NO
16A.cpp
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Ln 11·137 BGNU C++20 (64)