View Compilation Error

0_0_13039572_17480.cpp:6: error: `maxn' was not declared in this scope
0_0_13039572_17480.cpp:9: error: `maxn' was not declared in this scope
0_0_13039572_17480.cpp: In function `void init()':
0_0_13039572_17480.cpp:23: error: `r' undeclared (first use this function)
0_0_13039572_17480.cpp:23: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_13039572_17480.cpp: In function `void solve()':
0_0_13039572_17480.cpp:29: error: `cor' undeclared (first use this function)
0_0_13039572_17480.cpp:33: error: `r' undeclared (first use this function)