/in/foo.cc: In function 'int main()':
/in/foo.cc:29:7: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses]
    if (b[i-1]==g[b[i]][0]) if (g[b[i]][1]!=b[1]) {
       ^
/in/foo.cc:75:7: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses]
    if (b[i-1]==g[b[i]][0]) if (g[b[i]][1]!=b[1]) {
       ^