/in/foo.cc: In function 'int main()':
/in/foo.cc:15:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<strlen(a);i++){
               ^
/in/foo.cc:23:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<strlen(b);i++){
               ^
/in/foo.cc:73:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(k1=1;k1<=max(strlen(a)-f1,strlen(b)-f2);k1++){
             ^
/in/foo.cc:79:7: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if(k1>max(strlen(a),strlen(b))){
       ^
/in/foo.cc:83:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=1;i<=max(strlen(a)-f1,strlen(b)-f2);i++){
               ^
/in/foo.cc:86:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(j=i;j<=max(strlen(a),strlen(b));j++){
             ^
/in/foo.cc:89:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if(j>max(strlen(a),strlen(b))) break;
        ^