View Compilation Error

0_0_7957486_15189.cpp: In function `int recursive_arrange(int*, int, int, int, int*)':
0_0_7957486_15189.cpp:61: error: `s' undeclared (first use this function)
0_0_7957486_15189.cpp:61: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7957486_15189.cpp: At global scope:
0_0_7957486_15189.cpp:71: error: `main' must return `int'