#include using namespace std; typedef signed long long ll; #define _P(...) (void)printf(__VA_ARGS__) #define FOR(x,to) for(x=0;x<(to);x++) #define FORR(x,arr) for(auto& x:arr) #define FORR2(x,y,arr) for(auto& [x,y]:arr) #define ALL(a) (a.begin()),(a.end()) #define ZERO(a) memset(a,0,sizeof(a)) #define MINUS(a) memset(a,0xff,sizeof(a)) template bool chmax(T &a, const T &b) { if(a bool chmin(T &a, const T &b) { if(a>b){a=b;return 1;}return 0;} //------------------------------------------------------- int N; int X[303030],Y[303030]; map F,T; void solve() { int i,j,k,l,r,x,y; string s; cin>>N; vector Vs; F[0]=0; FOR(i,N) { T.clear(); cin>>X[i]>>Y[i]; FORR2(a,b,F) { T[X[i]]=max(T[X[i]],b+(a==Y[i]?Y[i]:0)+(X[i]==Y[i]?X[i]:0)); T[Y[i]]=max(T[Y[i]],b+(a==X[i]?X[i]:0)+(X[i]==Y[i]?X[i]:0)); } F=T; } ll ret=0; FORR2(a,b,F) ret=max(ret,b); cout<