foo.cpp:19:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^
foo.cpp: In function 'int main()':
foo.cpp:40:4: error: expected primary-expression before 'if'
    if(r[e[j].v].w1*w[i]>maxx)
    ^
foo.cpp:40:4: error: expected ';' before 'if'