/in/foo.cc: In function 'int main()':
/in/foo.cc:18:21: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    if(st.top()=='{' && s[i]=='}' || st.top()=='[' && s[i]==']' ||st.top()=='(' && s[i]==')'){
       ~~~~~~~~~~~~~~^~~~~~~~~~~~
/in/foo.cc:18:80: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    if(st.top()=='{' && s[i]=='}' || st.top()=='[' && s[i]==']' ||st.top()=='(' && s[i]==')'){
                                                                  ~~~~~~~~~~~~~~^~~~~~~~~~~~