View Compilation Error

0_0_11270219_24033.cpp: In function `void change1(int, int)':
0_0_11270219_24033.cpp:227: error: `ans' undeclared (first use this function)
0_0_11270219_24033.cpp:227: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11270219_24033.cpp:227: error: return-statement with a value, in function returning 'void'
0_0_11270219_24033.cpp: In function `void change2(int, int)':
0_0_11270219_24033.cpp:249: error: `fan' undeclared (first use this function)
0_0_11270219_24033.cpp: At global scope:
0_0_11270219_24033.cpp:271: error: `int fan[10005]' used prior to declaration
0_0_11270219_24033.cpp: In function `int main()':
0_0_11270219_24033.cpp:300: error: expected `;' before '}' token