QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#37714 | #1195. One-Way Conveyors | claes | WA | 10ms | 4684kb | C++ | 4.6kb | 2022-07-02 15:50:39 | 2022-07-02 15:50:42 |
Judging History
answer
#include <cstdio>
#include <iostream>
#include <cstring>
using namespace std ;
int n , m , l ;
int fir[10010] , nxt[200010] ;
short zx[200010] ;
int bs ;
bool gb[200010] , fw[200010] ;
short col[10010] , co = 0 ;
short dfn[10010] , low[10010] , tim ;
short fir1[10010] , nxt1[20010] , zx1[20010] , bs1 ;
short sq[10010] , sz[10010] ;
short upz[10010] , upf[10010] , dnz[10010] , dnf[10010] ;
short q[10010] , z[10010] , ll ;
short fa[10010] , sd[10010] ;
short dp[25][10010] ;
void dfs( int wz , int fa )
{
low[wz] = dfn[wz] = ++tim ;
// cout<< wz << ' ' << fa << ' ' << dfn[wz] << endl ;
for( int i = fir[wz] ; i != -1 ; i = nxt[i] )
{
if( zx[i] == fa ) continue ;
if( dfn[zx[i]] == 0 )
{
dfs( zx[i] , wz ) ;
low[wz] = min( low[wz] , low[zx[i]] ) ;
if( low[zx[i]] > low[wz] )
{
gb[i] = gb[i ^ 1] = 1 ;
}
}
else
{
low[wz] = min( low[wz] , dfn[zx[i]] ) ;
}
}
return ;
}
void dfs1( int wz , int fa , int coo )
{
col[wz] = coo ;
// cout<< wz << ' ' << col[wz] << endl ;
for( int i = fir[wz] ; i != -1 ; i = nxt[i] )
{
if( fw[i] == 1 ) continue ;
if( zx[i] == fa ) continue ;
if( gb[i] == 1 ) continue ;
q[ll] = wz ;
z[ll] = zx[i] ;
ll ++ ;
fw[i] = fw[i ^ 1] = 1 ;
if( col[zx[i]] == 0 ) dfs1( zx[i] , wz , coo ) ;
}
return ;
}
bool lll = false ;
bool ff[10010] ;
void dfs2( int wz )
{
if( wz == 0 ) lll = true ;
if( ff[wz] )
{
cout<< wz ;
lll = true ;
return ;
}
ff[wz] = 1 ;
for( int i = fir1[wz] ; i != -1 ; i = nxt1[i] )
{
if( zx1[i] == fa[wz] ) continue ;
fa[zx1[i]] = wz ;
sd[zx1[i]] = sd[wz] + 1 ;
dfs2( zx1[i] ) ;
}
return ;
}
void lca( int a , int b )
{
int ta = a ;
int tb = b ;
if( sd[a] > sd[b] )
{
for( int i = 19 ; i >= 0 ; i -- )
{
if( dp[i][a] == -1 ) continue ;
if( sd[dp[i][a]] > sd[b] )
{
a = dp[i][a] ;
}
}
if( fa[a] == b )
{
upz[a] += 1 ;
upf[ta] += -1 ;
// cout<< 'U' << ta << ' ' << a << endl ;
return ;
}
a = fa[a] ;
}
if( sd[b] > sd[a] )
{
for( int i = 19 ; i >= 0 ; i -- )
{
if( dp[i][b] == -1 ) continue ;
if( sd[dp[i][b]] > sd[a] )
{
b = dp[i][b] ;
}
}
// cout<< a << ' ' << b << endl ;
if( fa[b] == a )
{
dnz[b] += 1 ;
dnf[tb] += -1 ;
// cout<< 'D' << tb << ' ' << b << endl ;
return ;
}
b = fa[b] ;
}
for( int i = 19 ; i >= 0 ; i -- )
{
if( dp[i][a] != dp[i][b] )
{
a = dp[i][a] ;
b = dp[i][b] ;
}
}
upz[a] += 1 ;
upf[ta] += -1 ;
dnz[b] += 1 ;
dnf[tb] += -1 ;
return ;
}
bool flag = true ;
void dfs3( int wz , int ujs , int djs )
{
// cout<< wz << ' ' << fa[wz] << ' ' << ujs << ' ' << djs << endl ;
int uu , dd ;
ujs += upf[wz] ;
djs += dnf[wz] ;
for( int i = fir1[wz] ; i != -1 ; i = nxt1[i] )
{
if( zx1[i] == fa[wz] ) continue ;
uu = ujs + upz[zx1[i]] ;
dd = djs + dnz[zx1[i]] ;
if( uu > 0 && dd > 0 )
{
flag = false ;
return ;
}
if( uu > 0 )
{
q[ll] = sz[i] ;
z[ll] = sq[i] ;
ll ++ ;
}
else
{
q[ll] = sq[i] ;
z[ll] = sz[i] ;
ll ++ ;
}
dfs3( zx1[i] , uu , dd ) ;
}
return ;
}
int main ()
{
memset( fir , -1 , sizeof(fir) ) ;
memset( fir1 , -1 , sizeof(fir1) ) ;
int t1 , t2 ;
scanf( "%d%d" , &n , &m ) ;
for( int i = 0 ; i < m ; i ++ )
{
scanf( "%d%d" , &t1 , &t2 ) ;
t1 -- ;
t2 -- ;
nxt[bs] = fir[t1] ;
fir[t1] = bs ;
zx[bs] = t2 ;
bs ++ ;
nxt[bs] = fir[t2] ;
fir[t2] = bs ;
zx[bs] = t1 ;
bs ++ ;
}
dfs( 0 , -1 ) ;
for( int i = 0 ; i < n ; i ++ )
{
if( col[i] == 0 ) dfs1( i , -1 , ++ co ) ;
}
for( int i = 0 ; i < n ; i ++ )
{
for( int j = fir[i] ; j != -1 ; j = nxt[j] )
{
if( gb[j] )
{
nxt1[bs1] = fir1[col[i]] ;
fir1[col[i]] = bs1 ;
zx1[bs1] = col[zx[j]] ;
sq[bs1] = i ;
sz[bs1] = zx[j] ;
bs1 ++ ;
}
}
}
fa[1] = -1 ;
dfs2( 1 ) ;
if( lll ) return 0 ;
for( int i = 1 ; i <= co ; i ++ )
{
dp[0][i] = fa[i] ;
// cout<< dp[0][i] << ' ' ;
}
// cout<< endl ;
for( int j = 1 ; j < 20 ; j ++ )
{
for( int i = 1 ; i <= co ; i ++ )
{
if( dp[j - 1][i] != -1 )
{
dp[j][i] = dp[j - 1][dp[j - 1][i]] ;
}
}
}
scanf( "%d" , &l ) ;
for( int i = 0 ; i < l ; i ++ )
{
scanf( "%d%d" , &t1 , &t2 ) ;
t1 -- ;
t2 -- ;
if( col[t1] == col[t2] ) continue ;
lca( col[t1] , col[t2] ) ;
}
// cout<< 1111 << endl ;
dfs3( 1 , 0 , 0 ) ;
if( flag )
{
printf( "Yes\n" ) ;
}
else
{
printf( "No\n" ) ;
return 0 ;
}
for( int i = 0 ; i < ll ; i ++ )
{
printf( "%d %d\n" , q[i] + 1 , z[i] + 1 ) ;
}
return 0 ;
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 3ms
memory: 3952kb
input:
3 2 1 2 2 3 3 1 2 1 3 2 3
output:
Yes 1 2 2 3
result:
ok OK!
Test #2:
score: 0
Accepted
time: 0ms
memory: 3708kb
input:
3 2 1 2 2 3 3 1 2 1 3 3 2
output:
No
result:
ok OK!
Test #3:
score: 0
Accepted
time: 2ms
memory: 3884kb
input:
4 4 1 2 1 3 1 4 2 3 7 1 2 1 3 1 4 2 1 2 3 3 1 3 2
output:
Yes 1 3 3 2 2 1 1 4
result:
ok OK!
Test #4:
score: -100
Wrong Answer
time: 10ms
memory: 4684kb
input:
9990 47670 134 2450 4227 9100 1861 9948 120 8957 1161 4767 76 1714 5207 5838 2726 8974 2489 8619 2379 4933 3675 9554 344 3215 1654 6168 5630 6614 3247 5202 4456 5373 4380 6605 2626 4064 2194 6332 2749 9719 360 5059 7967 8835 5433 6494 497 6638 5945 9063 7576 7879 3550 4107 83 2891 3107 6917 2089 689...
output:
211112291932295327153146271531551935353155391551639148162337961481481636254441685983632399732339750165501271512991762991512993051515291139191189761899118991127521659279266793259792061081087925979913720119012527212513752521654827252072514320725274827687068250702026848165312233102232232423117724213117...
result:
wrong answer Output doesn't match the expected answer