0_0_6842393_7711.cpp: In function `void solve()':
0_0_6842393_7711.cpp:66: error: `pre' undeclared (first use this function)
0_0_6842393_7711.cpp:66: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6842393_7711.cpp: In function `int main()':
0_0_6842393_7711.cpp:116: error: `tem' undeclared (first use this function)
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