Main.cc: In function 'int main()':
Main.cc:7:14: error: expected primary-expression before '<=' token
for(int i=1;<=a;i++){
^
Main.cc:12:12: error: invalid types 'int[int]' for array subscript
while((a[i]!=c)&&(i<=a)){
^
Main.cc:20:12: error: invalid types 'int[int]' for array subscript
while((a[i]==c)&&(i<=a)){
^
Main.cc:5:21: warning: unused variable 'd' [-Wunused-variable]
int a,b[2001],c,d=0;
^