View Compilation Error

0_0_2333957_4320.cpp:4:22: algorithm.h: No such file or directory
0_0_2333957_4320.cpp:12: error: two or more data types in declaration of `one'
0_0_2333957_4320.cpp: In function `int findflag(int)':
0_0_2333957_4320.cpp:35: error: `flag' undeclared (first use this function)
0_0_2333957_4320.cpp:35: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2333957_4320.cpp: In function `int main()':
0_0_2333957_4320.cpp:48: error: `i' undeclared (first use this function)
0_0_2333957_4320.cpp:52: error: expected `;' before "if"
0_0_2333957_4320.cpp:57: error: invalid conversion from `int (*)(const personal&, const personal&)' to `int (*)(const void*, const void*)'
0_0_2333957_4320.cpp:57: error:   initializing argument 4 of `void qsort(void*, size_t, size_t, int (*)(const void*, const void*))'