foo.cpp: In function 'int main()':
foo.cpp:7:5: error: expected initializer before 'for'
     for(int i=0;i<l;++i)t[i]=true;
     ^
foo.cpp:7:17: error: 'i' was not declared in this scope
     for(int i=0;i<l;++i)t[i]=true;
                 ^
foo.cpp:11:30: error: 't' was not declared in this scope
         for(int j=a;j<=b;++j)t[j]=false;
                              ^
foo.cpp:14:28: error: 't' was not declared in this scope
     for(int i=0;i<l;++i)if(t[i])++s;
                            ^