Submission #1025907
Source Code Expand
#include<cstdio> #include<algorithm> #include<cstring> #include<iostream> #include<vector> #include<set> #include<map> #include<bitset> #include<cmath> #include<string> #define ls (t<<1) #define rs ((t<<1)+1) #define mid ((l+r)>>1) #define fi first #define se second #define mk make_pair #define pb push_back #define N 100005 #define M 200005 #define seed 23333 using namespace std; int i,j,m,n,p,k,now[N],size[2][N],fa[N],x,y,Q[N],gtm[N]; vector<int>v[N]; long long ans; void dfs(int x) { size[now[x]][x]++; int i; for (i=0;i<(int)v[x].size();++i) { int p=v[x][i]; if (fa[x]==p) continue; fa[p]=x; now[p]=now[x]^1; dfs(p); size[0][x]+=size[0][p]; size[1][x]+=size[1][p]; } if (x!=1) ans+=abs(size[0][x]-size[1][x]); } void worka() { dfs(1); if (size[0][1]==size[1][1]) cout<<ans<<endl; else puts("-1"); } int sum[N],vis[N]; int find_cycle_length() { for (i=1;i<=n;++i) sum[i]=(int)v[i].size(); for (i=1;i<=n;++i) if (sum[i]==1) Q[++Q[0]]=i,vis[i]=1; int l=1; for (l=1;l<=Q[0];++l) { int p=Q[l]; for (i=0;i<(int)v[p].size();++i) { int k=v[p][i]; --sum[k]; if (sum[k]==1) vis[k]=1,Q[++Q[0]]=k; } } return n-Q[0]; } int x_next[N],ga,gb; void dfs_even(int x) { int i; size[now[x]][x]++; for (i=0;i<(int)v[x].size();++i) { int p=v[x][i]; if ((x==ga&&p==gb)||(x==gb&&p==ga)) continue; if (fa[x]==p) continue; fa[p]=x; now[p]=now[x]^1; dfs_even(p); size[0][x]+=size[0][p]; size[1][x]+=size[1][p]; gtm[x]|=gtm[p]; } if (x!=ga) { if (!gtm[x]) ans+=abs(size[0][x]-size[1][x]); else x_next[++x_next[0]]=size[1][x]-size[0][x]; } } void work_even_cycle() { for (i=1;i<=n;++i) if (!vis[i]) { for (j=0;j<(int)v[i].size();++j) { if (!vis[v[i][j]]) break; } break; } ga=i,gb=v[i][j]; gtm[gb]=1; dfs_even(ga); x_next[++x_next[0]]=0; sort(x_next+1,x_next+x_next[0]+1); int id=(x_next[0]+1)/2; for (i=1;i<=x_next[0];++i) ans+=abs(x_next[id]-x_next[i]); if (size[0][ga]==size[1][ga]) cout<<ans<<endl; else puts("-1"); } void dfs_odd(int x) { int i; size[now[x]][x]++; for (i=0;i<(int)v[x].size();++i) { int p=v[x][i]; if ((x==ga&&p==gb)||(x==gb&&p==ga)) continue; if (fa[x]==p) continue; fa[p]=x; now[p]=now[x]^1; dfs_odd(p); size[0][x]+=size[0][p]; size[1][x]+=size[1][p]; } } void work_odd_cycle() { for (i=1;i<=n;++i) if (!vis[i]) { for (j=0;j<(int)v[i].size();++j) { if (!vis[v[i][j]]) break; } break; } ga=i,gb=v[i][j]; dfs_odd(ga); if (abs(size[0][ga]-size[1][ga])&1) { puts("-1"); return; } else if (size[0][ga]>=size[1][ga]) { int l=(size[0][ga]-size[1][ga])>>1; ans+=l; size[1][ga]+=l,size[1][gb]+=l; for (i=fa[gb];i;i=fa[i]) size[1][i]+=l; } else { int l=(size[1][ga]-size[0][ga])>>1; ans+=l; size[0][ga]+=l,size[0][gb]+=l; for (i=fa[gb];i;i=fa[i]) size[0][i]+=l; } for (i=1;i<=n;++i) if (i!=ga) ans+=abs(size[0][i]-size[1][i]); cout<<ans<<endl; } void workb() { x=find_cycle_length(); if (x&1) work_odd_cycle(); else work_even_cycle(); } int main() { scanf("%d%d",&n,&m); for (i=1;i<=m;++i) { scanf("%d%d",&x,&y); v[x].pb(y); v[y].pb(x); } if (m==n-1) worka(); else workb(); }
Submission Info
Submission Time | |
---|---|
Task | F - Namori |
User | qiaoranliqu |
Language | C++14 (GCC 5.4.1) |
Score | 2200 |
Code Size | 3527 Byte |
Status | AC |
Exec Time | 60 ms |
Memory | 16256 KB |
Compile Error
./Main.cpp: In function ‘int main()’: ./Main.cpp:174:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ ./Main.cpp:177:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^
Judge Result
Set Name | Sample | Subtask1 | All | ||||||
---|---|---|---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 1500 / 1500 | 700 / 700 | ||||||
Status |
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Set Name | Test Cases |
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Sample | 0_00.txt, 0_01.txt, 0_02.txt, 0_03.txt |
Subtask1 | 0_00.txt, 0_01.txt, 1_00.txt, 1_01.txt, 1_02.txt, 1_03.txt, 1_04.txt, 1_05.txt, 1_06.txt, 1_07.txt, 1_08.txt, 1_09.txt, 1_10.txt, 1_11.txt, 1_12.txt, 1_13.txt, 1_14.txt, 1_15.txt, 1_16.txt, 1_17.txt |
All | 0_00.txt, 0_01.txt, 0_02.txt, 0_03.txt, 1_00.txt, 1_01.txt, 1_02.txt, 1_03.txt, 1_04.txt, 1_05.txt, 1_06.txt, 1_07.txt, 1_08.txt, 1_09.txt, 1_10.txt, 1_11.txt, 1_12.txt, 1_13.txt, 1_14.txt, 1_15.txt, 1_16.txt, 1_17.txt, 2_00.txt, 2_01.txt, 2_02.txt, 2_03.txt, 2_04.txt, 2_05.txt, 2_06.txt, 2_07.txt, 2_08.txt, 2_09.txt, 2_10.txt, 2_11.txt, 2_12.txt, 2_13.txt, 2_14.txt, 2_15.txt, 2_16.txt, 2_17.txt, 2_18.txt, 2_19.txt, 2_20.txt, 2_21.txt, 2_22.txt, 2_23.txt, 2_24.txt, 2_25.txt, 2_26.txt, 2_27.txt, 2_28.txt, 2_29.txt, 2_30.txt, 2_31.txt, 2_32.txt, 2_33.txt, 2_34.txt, 2_35.txt, 2_36.txt, 2_37.txt, 2_38.txt, 2_39.txt, 2_40.txt, 2_41.txt, 2_42.txt, 2_43.txt |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
0_00.txt | AC | 5 ms | 2560 KB |
0_01.txt | AC | 5 ms | 2560 KB |
0_02.txt | AC | 5 ms | 2560 KB |
0_03.txt | AC | 5 ms | 2560 KB |
1_00.txt | AC | 5 ms | 2560 KB |
1_01.txt | AC | 55 ms | 14848 KB |
1_02.txt | AC | 44 ms | 9600 KB |
1_03.txt | AC | 36 ms | 7672 KB |
1_04.txt | AC | 50 ms | 10880 KB |
1_05.txt | AC | 50 ms | 10496 KB |
1_06.txt | AC | 50 ms | 10496 KB |
1_07.txt | AC | 49 ms | 9728 KB |
1_08.txt | AC | 51 ms | 11136 KB |
1_09.txt | AC | 42 ms | 7680 KB |
1_10.txt | AC | 43 ms | 7424 KB |
1_11.txt | AC | 45 ms | 7424 KB |
1_12.txt | AC | 46 ms | 7296 KB |
1_13.txt | AC | 47 ms | 7936 KB |
1_14.txt | AC | 46 ms | 7424 KB |
1_15.txt | AC | 46 ms | 7296 KB |
1_16.txt | AC | 46 ms | 7296 KB |
1_17.txt | AC | 46 ms | 7296 KB |
2_00.txt | AC | 5 ms | 2560 KB |
2_01.txt | AC | 59 ms | 16256 KB |
2_02.txt | AC | 51 ms | 12928 KB |
2_03.txt | AC | 39 ms | 8824 KB |
2_04.txt | AC | 57 ms | 12928 KB |
2_05.txt | AC | 57 ms | 12800 KB |
2_06.txt | AC | 57 ms | 12800 KB |
2_07.txt | AC | 57 ms | 12928 KB |
2_08.txt | AC | 57 ms | 12800 KB |
2_09.txt | AC | 49 ms | 9216 KB |
2_10.txt | AC | 51 ms | 9088 KB |
2_11.txt | AC | 52 ms | 8960 KB |
2_12.txt | AC | 53 ms | 8960 KB |
2_13.txt | AC | 58 ms | 12288 KB |
2_14.txt | AC | 53 ms | 9216 KB |
2_15.txt | AC | 54 ms | 8960 KB |
2_16.txt | AC | 53 ms | 8960 KB |
2_17.txt | AC | 53 ms | 8960 KB |
2_18.txt | AC | 5 ms | 2560 KB |
2_19.txt | AC | 49 ms | 12412 KB |
2_20.txt | AC | 38 ms | 8440 KB |
2_21.txt | AC | 60 ms | 16256 KB |
2_22.txt | AC | 53 ms | 12416 KB |
2_23.txt | AC | 53 ms | 12288 KB |
2_24.txt | AC | 55 ms | 12160 KB |
2_25.txt | AC | 53 ms | 12416 KB |
2_26.txt | AC | 55 ms | 12160 KB |
2_27.txt | AC | 47 ms | 8832 KB |
2_28.txt | AC | 50 ms | 8576 KB |
2_29.txt | AC | 50 ms | 8576 KB |
2_30.txt | AC | 52 ms | 8576 KB |
2_31.txt | AC | 54 ms | 11008 KB |
2_32.txt | AC | 52 ms | 8704 KB |
2_33.txt | AC | 52 ms | 8576 KB |
2_34.txt | AC | 52 ms | 8576 KB |
2_35.txt | AC | 52 ms | 8576 KB |
2_36.txt | AC | 39 ms | 8824 KB |
2_37.txt | AC | 39 ms | 8824 KB |
2_38.txt | AC | 39 ms | 8824 KB |
2_39.txt | AC | 39 ms | 8824 KB |
2_40.txt | AC | 39 ms | 8824 KB |
2_41.txt | AC | 39 ms | 8824 KB |
2_42.txt | AC | 39 ms | 8824 KB |
2_43.txt | AC | 38 ms | 8824 KB |