UVa 11330 (decomposition of the replacement cycle) Andy's Shoes

And UVa11077 's analysis is very similar.

We fixed the shoes on our left foot, and then we considered the shoes of the right foot as a substitution decomposition.

For a circular section with a length of L, swap to the correct position at least L-1 times.

1#include <cstdio>2#include <cstring>3#include <map>4 using namespacestd;5 6 BOOLvis[10000+Ten];7 8 intMain ()9 {Ten     //freopen ("In.txt", "R", stdin); One  A     intT; -scanf"%d", &T); -      while(t--) the     { -         intN, a, B; -map<int,int>m; -scanf"%d", &n); +          for(inti =0; I < n; i++) -         { +scanf"%d%d", &a, &b); AM[a] =b; at         } -         intAns =0; -map<int,int>:: iterator It; -memset (Vis,false,sizeof(Vis)); -          for(It = M.begin (); It! = M.end (); it++) -         { in             inti = it->First ; -             if(!Vis[i]) to             { +                 intCNT =0; -                 intj =i; the                  Do *                 { $cnt++;Panax NotoginsengVIS[J] =true; -j =M[j]; the} while(J! =i); +Ans + = cnt-1; A             } the         } +printf"%d\n", ans); -     } $  $     return 0; -}

code June

UVa 11330 (decomposition of the replacement cycle) Andy's Shoes