/in/foo.cc: In function 'int main()':
/in/foo.cc:56:30: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
      if(tag==1)p[i].b1|=(1<<j-1);  
                             ~^~
/in/foo.cc:57:30: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
      if(tag==2)p[i].b2|=(1<<j-1);  //得到每个补丁包的先决条件串
                             ~^~
/in/foo.cc:61:30: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
      if(tag==1)p[i].f2|=(1<<j-1);
                             ~^~
/in/foo.cc:62:30: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
      if(tag==2)p[i].f1|=(1<<j-1);  //得到每个补丁包运行之后的状态串
                             ~^~