0_0_11187617_7066.cpp: In function `int main(int, char**)':
0_0_11187617_7066.cpp:82: error: `change' undeclared (first use this function)
0_0_11187617_7066.cpp:82: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11187617_7066.cpp:122: error: expected primary-expression before '}' token
0_0_11187617_7066.cpp:122: error: expected `;' before '}' token
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