0_0_7029269_5781.cpp: In function `int main()':
0_0_7029269_5781.cpp:9: error: `N' undeclared (first use this function)
0_0_7029269_5781.cpp:9: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7029269_5781.cpp:18: error: `v1' undeclared (first use this function)
0_0_7029269_5781.cpp:19: error: `v2' undeclared (first use this function)
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