foo.cc: In function 'int main()':
foo.cc:42:34: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
 if(x>='a'&&x<='z'&&y<='z'&&y>='a'&&x<y||x>='0'&&x<='9'&&y>='0'&&y<='9'&&x<y){//满足条件 不输出'-' 输出两个字符的展开
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
foo.cc:35:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d%d%d",&p1,&p2,&p3);
 ~~~~~^~~~~~~~~~~~~~~~~~~~~~
foo.cc:36:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%s",a+1);
 ~~~~~^~~~~~~~~~

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。