Main.cc: In function 'int main()':
Main.cc:12:5: error: expected ',' or ';' before 'for'
for(int i=l-1;i>0;i--){
^
Main.cc:12:19: error: 'i' was not declared in this scope
for(int i=l-1;i>0;i--){
^
Main.cc:8:15: warning: unused variable 'x' [-Wunused-variable]
long long x=1,s=0;
^
Main.cc:11:9: warning: unused variable 'l' [-Wunused-variable]
int l=strlen(a)
^