标签：style blog http color io os ar for sp
这个属于DFS枚举：
/* ID: qq104801 LANG: C++ TASK: wormhole QQ:104804687 */ #include <iostream> #include <fstream> #include <cstring> #include <vector> #include <queue> #include <stack> #include <algorithm> #include <cmath> using namespace std; #define loop(i,n) for(int i=0;i<(n);i++) #define loop2(i,n) for(int i=1;i<=(n);i++) const int maxn=13; const int inf=1<<30; int n,x[maxn],y[maxn]; int partner[maxn],next_on_right[maxn]; bool cycle_exists(void) { /* for(int i=1;i<=n;i++) cout<<i<<":"<<partner[i]<<" "; cout<<endl; */ for(int start=1;start<=n;start++) { int pos=start; for(int count=0;count<n;count++) pos=next_on_right[partner[pos]]; if(pos!=0) return true; } return false; } int solve(void) { int i,total=0; for(i=1;i<=n;i++) if(partner[i]==0)break; if(i>n) { if(cycle_exists()) return 1; else return 0; } for(int j=i+1;j<=n;j++) if(partner[j]==0) { partner[i]=j; partner[j]=i; total+=solve(); partner[i]=partner[j]=0; } return total; } void test() { freopen("wormhole.in","r",stdin); freopen("wormhole.out","w",stdout); cin>>n; loop2(i,n) { cin>>x[i]>>y[i]; //cout<<x[i]<<":"<<y[i]<<endl; } loop2(i,n) loop2(j,n) if(x[j]>x[i]&&y[i]==y[j]) if(next_on_right[i]==0 || x[j]-x[i]<x[next_on_right[i]]-x[i]) next_on_right[i]=j; cout<<solve()<<endl; } int main () { test(); return 0; }
test data:
USACO Training Grader Results 4 users online CHN/2 IND/1 KAZ/1 USER: cn tom [qq104801] TASK: wormhole LANG: C++ Compiling... Compile: OK Executing... Test 1: TEST OK [0.008 secs, 3380 KB] Test 2: TEST OK [0.008 secs, 3380 KB] Test 3: TEST OK [0.005 secs, 3380 KB] Test 4: TEST OK [0.011 secs, 3380 KB] Test 5: TEST OK [0.008 secs, 3380 KB] Test 6: TEST OK [0.011 secs, 3380 KB] Test 7: TEST OK [0.011 secs, 3380 KB] Test 8: TEST OK [0.014 secs, 3380 KB] Test 9: TEST OK [0.016 secs, 3380 KB] Test 10: TEST OK [0.019 secs, 3380 KB] All tests OK. Your program (‘wormhole‘) produced all correct answers! This is your submission #2 for this problem. Congratulations! Here are the test data inputs: ------- test 1 [length 18 bytes] ---- 4 0 0 1 0 1 1 0 1 ------- test 2 [length 23 bytes] ---- 4 21 7 11 23 11 7 5 10 ------- test 3 [length 37 bytes] ---- 6 1 15 20 15 17 11 22 21 25 11 20 17 ------- test 4 [length 117 bytes] ---- 6 879221060 76350727 161945371 76350727 380619073 76350727 896289713 76350727 852891025 852349940 519959866 76350727 ------- test 5 [length 159 bytes] ---- 8 491007315 324539677 99582962 578796531 491007315 768974420 373902710 578796531 99582962 332416760 946724340 321414549 976998120 638226676 49126574 437845706 ------- test 6 [length 198 bytes] ---- 10 987878530 332490544 545074228 332490544 571194544 278963943 32922985 229703843 571194544 851333603 90862786 28227282 219975775 267376202 219975775 332490544 90862786 62367085 872930617 951881113 ------- test 7 [length 243 bytes] ---- 12 636437309 704270751 695056713 700147825 636437309 356396548 921201220 589666013 430411607 671693685 324259336 671693685 723442153 589666013 528904109 419799944 921201220 356396548 723442153 856537355 691516566 726853849 941903572 634527403 ------- test 8 [length 53 bytes] ---- 12 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 10 1 10 0 ------- test 9 [length 243 bytes] ---- 12 572085931 667578536 964406504 667578536 656852339 870264627 110654368 823223484 513786208 528178006 620147001 528178006 227047539 667578536 656852339 528178006 945298921 528178006 945298921 870264627 840030425 870264627 828839382 528178006 ------- test 10 [length 236 bytes] ---- 12 5138254 91583927 607865472 167507876 51248250 8250417 675467597 611809280 157130071 946061365 138261433 967068106 769112165 966993974 675467597 144175980 769112165 475105594 51248250 144175980 947874168 111530133 164921238 967068106
标签：style blog http color io os ar for sp
原文地址：http://www.cnblogs.com/dpblue/p/4040571.html
