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2025F2700· international gm3s512 MB⌨ stdin/stdout
#constructive algorithms#dfs and similar#dp#graphs#greedy#trees

Examples

Sample 1of 3
Input
3 4
1 2
3 2
3 1
1 2
Output
y+
x+
x-
y-
Sample 2of 3
Input
4 4
1 2
2 3
3 4
3 2
Output
y+
y+
x-
y-
Sample 3of 3
Input
4 2
2 1
4 3
Output
y+
x+
2025F.cpp
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Ln 11·137 BGNU C++20 (64)
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