/in/foo.cc: In function 'int main()':
/in/foo.cc:13:48: warning: suggest parentheses around operand of '!' or change '|' to '||' or '!' to '~' [-Wparentheses]
   for (int j=s; j>=w; j--) if (f[j-w] && ((!f[j] | f[j]++) || (f[j-w]>1 && (f[j]=2)))) f[j]=1,g[j]=g[j-w],g[j][i]=1;
                                                ^
/in/foo.cc:13:86: warning: operation on 'f[j]' may be undefined [-Wsequence-point]
   for (int j=s; j>=w; j--) if (f[j-w] && ((!f[j] | f[j]++) || (f[j-w]>1 && (f[j]=2)))) f[j]=1,g[j]=g[j-w],g[j][i]=1;
                                                                                      ^