Main.cc: In function ‘void pai(int, int)’:
Main.cc:12:6: error: ‘a’ was not declared in this scope
if(a[i].shu<=a[j].shu)
^
Main.cc:13:3: error: ‘b’ was not declared in this scope
b[f++]=a[i++];
^
Main.cc:15:3: error: ‘b’ was not declared in this scope
b[f++]=a[j++];
^
Main.cc:18:15: error: ‘b’ was not declared in this scope
while(i<=mid)b[f++]=a[i++];
^
Main.cc:18:22: error: ‘a’ was not declared in this scope
while(i<=mid)b[f++]=a[i++];
^
Main.cc:20:13: error: ‘b’ was not declared in this scope
while(j<=r)b[f++]=a[j++];
^
Main.cc:20:20: error: ‘a’ was not declared in this scope
while(j<=r)b[f++]=a[j++];
^
Main.cc:21:19: error: ‘a’ was not declared in this scope
for(i=l;i<=r;i++)a[i]=b[i];
^
Main.cc:21:24: error: ‘b’ was not declared in this scope
for(i=l;i<=r;i++)a[i]=b[i];
^