foo.cpp: In function 'int main()':
foo.cpp:7:5: error: expected initializer before 'for'
     for(i=0;i<l;++i)t[i]=true;
     ^
foo.cpp:7:14: warning: statement has no effect [-Wunused-value]
     for(i=0;i<l;++i)t[i]=true;
              ^
foo.cpp:7:20: error: expected ';' before ')' token
     for(i=0;i<l;++i)t[i]=true;
                    ^
foo.cpp:11:26: error: 't' was not declared in this scope
         for(j=a;j<=b;++j)t[j]=false;
                          ^
foo.cpp:14:24: error: 't' was not declared in this scope
     for(i=0;i<l;++i)if(t[i])++s;
                        ^