0_0_7067951_18175.cpp: In function `int main()':
0_0_7067951_18175.cpp:4: error: `NULL' undeclared (first use this function)
0_0_7067951_18175.cpp:4: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7067951_18175.cpp:4: error: `cin' undeclared (first use this function)
0_0_7067951_18175.cpp:6: error: `cout' is not a member of `std'
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