/in/foo.cc: In function 'int main()':
/in/foo.cc:25:26: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    if (fabs(c[j][i])>eps && w[j]<w[r+1] || fabs(c[r+1][i])<eps) {
        ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~