/in/foo.cc: In function 'int main()':
/in/foo.cc:21:37: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'long long int*' [-Wformat=]
      scanf("%d %d",&ss[i].p,&ss[i].a);  //农民要价（单价）和数量 
                                     ^
/in/foo.cc:21:37: warning: format '%d' expects argument of type 'int*', but argument 3 has type 'long long int*' [-Wformat=]
/in/foo.cc:23:6: warning: array subscript is below array bounds [-Warray-bounds]
  sort(ss-1,ss+n-1,cmp);
  ~~~~^~~~~~~~~~~~~~~~~
/in/foo.cc:23:6: warning: array subscript is below array bounds [-Warray-bounds]
/in/foo.cc:23:6: warning: array subscript is below array bounds [-Warray-bounds]
/in/foo.cc:23:6: warning: array subscript is below array bounds [-Warray-bounds]
/in/foo.cc:23:6: warning: array subscript is below array bounds [-Warray-bounds]