/in/foo.cc: In function 'int main()':
/in/foo.cc:38:20: warning: array subscript is above array bounds [-Warray-bounds]
             if (a[j]==1) b[++t]=s+k;
                 ~~~^
/in/foo.cc:39:16: warning: array subscript is above array bounds [-Warray-bounds]
             a[j]=2;
             ~~~^