View Compilation Error

0_0_29177262_26453.cpp: In function 'int main()':
0_0_29177262_26453.cpp:26:19: error: invalid conversion from 'int*' to 'size_t {aka long long unsigned int}' [-fpermissive]
        qsort(a+1,a+t,cmp);
                   ^
0_0_29177262_26453.cpp:26:25: error: invalid conversion from 'int (*)(int, int)' to 'size_t {aka long long unsigned int}' [-fpermissive]
        qsort(a+1,a+t,cmp);
                         ^
0_0_29177262_26453.cpp:26:25: error: too few arguments to function 'void qsort(void*, size_t, size_t, int (*)(const void*, const void*))'
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdlib:72:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:59,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62,
                 from 0_0_29177262_26453.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/stdlib.h:353:16: note: declared here
   void __cdecl qsort(void *_Base,size_t _NumOfElements,size_t _SizeOfElements,int (__cdecl *_PtFuncCompare)(const void *,const void *));
                ^