/in/foo.cc: In function 'int main()':
/in/foo.cc:10:36: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    if(yw[j]<yw[j+1]||yw[j]==yw[j+1]&&sx[j]<sx[j+1]){
                      ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~