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QOJ
| ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
|---|---|---|---|---|---|---|---|---|---|
| #285950 | #7607. The Doubling Game 2 | Sorting | WA | 4ms | 51524kb | C++20 | 5.3kb | 2023-12-17 00:38:42 | 2023-12-17 00:38:43 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std ;
typedef long long ll ;
typedef unsigned long long ull ;
typedef pair < int , int > pii ;
typedef vector < int > vi ;
#define fi first
#define se second
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
const int MAXN = 3e5 + 7 ;
const int MOD = 1e9 + 7 ;
const int LOG = 22 ;
int n ;
vector < int > v[ MAXN ] ;
int subtree[ MAXN ] ;
ll dp[ MAXN ][ LOG ] , wtf[ MAXN ][ LOG ] ; //
ll root[ MAXN ][ LOG ] ; //
ll complete[ MAXN ] ;
int mxpw[ MAXN ] ;
ll f[ ( 1 << LOG ) ][ LOG ] ;
int bit_rv[ 2 * ( 1 << LOG ) ] ;
bool cmp ( int x , int y ) {
return ( mxpw[ x ] < mxpw[ y ] ) ;
}
void dfs ( int x , int prv ) {
vector < int > children ;
for ( auto y : v[ x ] ) {
if ( y == prv ) { continue ; }
dfs ( y , x ) ;
children.push_back ( y ) ;
}
sort ( children.begin ( ) , children.end ( ) , cmp ) ;
mxpw[ x ] = 0 ;
subtree[ x ] = 1 ;
for ( int i = 0 ; i < LOG ; ++ i ) {
f[ 0 ][ i ] = 0 ;
}
f[ 0 ][ LOG - 1 ] = 1 ;
for ( auto y : children ) {
subtree[ x ] += subtree[ y ] ;
int rem = mxpw[ x ] ;
mxpw[ x ] = max ( mxpw[ x ] , min ( mxpw[ x ] + 2 , mxpw[ y ] + 2 ) ) ;
// while ( mxpw[ x ] < LOG - 1 && ( 1 << mxpw[ x ] ) < 2 * subtree[ x ] ) { ++ mxpw[ x ] ; }
if ( rem < mxpw[ x ] ) {
int lo = ( 1 << rem ) ;
int hi = ( 1 << mxpw[ x ] ) - 1 ;
for ( int i = lo ; i <= hi ; ++ i ) {
for ( int j = 0 ; j < LOG ; ++ j ) {
f[ i ][ j ] = 0 ;
}
}
}
for ( int i = ( 1 << mxpw[ x ] ) - 1 ; i >= 0 ; -- i ) {
for ( int dig = 0 ; dig <= mxpw[ x ] ; ++ dig ) {
wtf[ i ][ dig ] = 0 ;
}
wtf[ i ][ LOG - 1 ] = 0 ;
}
for ( int i = ( 1 << mxpw[ x ] ) - 1 ; i >= 0 ; -- i ) {
for ( int j = 0 ; j <= mxpw[ y ] ; ++ j ) {
if ( ( i & ( 1 << j ) ) == 0 ) {
for ( int dig = 0 ; dig <= mxpw[ x ] ; ++ dig ) {
if ( j >= dig ) { continue ; }
wtf[ ( i + ( 1 << j ) ) ][ dig ] = ( wtf[ ( i + ( 1 << j ) ) ][ dig ] + f[ i ][ dig ] * root[ y ][ j ] ) % MOD ;
}
wtf[ ( i + ( 1 << j ) ) ][ LOG - 1 ] = ( wtf[ ( i + ( 1 << j ) ) ][ LOG - 1 ] + f[ i ][ LOG - 1 ] * root[ y ][ j ] ) % MOD ;
wtf[ i ][ j ] = ( wtf[ i ][ j ] + f[ i ][ LOG - 1 ] * dp[ y ][ j ] ) % MOD ;
}
wtf[ i ][ j ] = ( wtf[ i ][ j ] + f[ i ][ j ] * complete[ y ] ) % MOD ;
}
wtf[ i ][ LOG - 1 ] = ( wtf[ i ][ LOG - 1 ] + f[ i ][ LOG - 1 ] * complete[ y ] ) % MOD ;
}
for ( int i = ( 1 << mxpw[ x ] ) - 1 ; i >= 0 ; -- i ) {
for ( int dig = 0 ; dig <= mxpw[ x ] ; ++ dig ) {
f[ i ][ dig ] = wtf[ i ][ dig ] ;
}
f[ i ][ LOG - 1 ] = wtf[ i ][ LOG - 1 ] ;
}
}
/**
for ( int i = 0 ; i < ( 1 << mxpw[ x ] ) ; ++ i ) {
for ( int j = 0 ; j <= mxpw[ x ] ; ++ j ) {
printf ( "vertex %d --> f[ %d ][ %d ] = %lld\n" , x , i , j , f[ i ][ j ] ) ;
}
printf ( "vertex %d --> f[ %d ][ -1 ] = %lld\n" , x , i , f[ i ][ LOG - 1 ] ) ;
}
**/
for ( int mask = 0 ; mask < ( 1 << mxpw[ x ] ) ; ++ mask ) {
int lw = bit_rv[ ( ( ~mask ) & -( ~mask ) ) ] ; // smallest 0 bit id
for ( int p1 = 0 ; p1 < LOG ; ++ p1 ) {
if ( ( mask & ( 1 << p1 ) ) > 0 ) { continue ; }
if ( p1 == LOG - 1 ) { //
if ( ( ( mask + ( 1 << lw ) ) & ( mask + ( 1 << lw ) + 1 ) ) == 0 ) {
dp[ x ][ lw ] = ( dp[ x ][ lw ] + f[ mask ][ p1 ] ) % MOD ;
}
if ( ( mask & ( mask + 1 ) ) == 0 ) {
root[ x ][ lw ] = ( root[ x ][ lw ] + f[ mask ][ p1 ] ) % MOD ;
complete[ x ] = ( complete[ x ] + f[ mask ][ p1 ] ) % MOD ;
}
}
else {
if ( ( mask + ( 1 << lw ) ) == ( 1 << p1 ) - 1 ) {
dp[ x ][ lw ] = ( dp[ x ][ lw ] + f[ mask ][ p1 ] ) % MOD ;
}
if ( mask == ( 1 << p1 ) - 1 ) {
complete[ x ] = ( complete[ x ] + f[ mask ][ p1 ] ) % MOD ;
}
}
}
}
/**
printf ( "----- vertex %d\n" , x ) ;
printf ( "complete[ %d ] = %lld\n" , x , complete[ x ] ) ;
for ( int i = 0 ; i <= mxpw[ x ] ; ++ i ) {
printf ( "dp[ %d ][ %d ] = %lld\n" , x , i , dp[ x ][ i ] ) ;
printf ( "root[ %d ][ %d ] = %lld\n" , x , i , root[ x ][ i ] ) ;
}
**/
}
void solve ( ) {
cin >> n ;
for ( int i = 1 , x , y ; i < n ; ++ i ) {
cin >> x >> y ;
v[ x ].push_back ( y ) ;
v[ y ].push_back ( x ) ;
}
for ( int i = 0 ; i < 2 * ( 1 << LOG ) ; ++ i ) {
bit_rv[ i ] = -1 ;
}
for ( int i = 0 ; i <= LOG ; ++ i ) {
bit_rv[ ( 1 << i ) ] = i ;
}
dfs ( 1 , -1 ) ;
cout << complete[ 1 ] << "\n" ;
}
int main ( ) {
ios_base :: sync_with_stdio ( false ) ;
cin.tie ( NULL ) ;
int t = 1 ; // cin >> t ;
while ( t -- ) { solve ( ) ; }
return 0 ;
}
詳細信息
Test #1:
score: 100
Accepted
time: 4ms
memory: 49208kb
input:
5 1 2 1 3 1 4 4 5
output:
21
result:
ok single line: '21'
Test #2:
score: 0
Accepted
time: 0ms
memory: 47224kb
input:
1
output:
1
result:
ok single line: '1'
Test #3:
score: 0
Accepted
time: 4ms
memory: 51524kb
input:
128 11 32 116 81 65 4 117 47 5 81 104 30 61 8 82 59 95 20 92 29 29 127 97 39 123 33 59 128 115 33 83 67 74 16 77 33 64 73 124 123 8 127 61 51 101 122 35 90 119 116 112 27 81 93 109 123 54 1 119 100 116 16 65 47 67 27 22 105 76 87 36 39 27 96 72 31 91 123 21 105 118 12 110 48 121 72 14 115 24 16 106 ...
output:
508800953
result:
ok single line: '508800953'
Test #4:
score: -100
Wrong Answer
time: 0ms
memory: 49360kb
input:
256 53 177 57 242 74 90 107 104 209 169 132 70 152 142 71 168 143 99 91 130 202 140 49 165 209 193 209 137 159 188 247 48 49 21 20 208 155 185 120 231 83 87 37 84 143 18 106 8 114 79 191 158 208 256 133 252 215 92 199 108 166 168 39 217 85 69 204 139 100 75 111 6 230 198 79 130 26 155 155 38 55 81 1...
output:
711068857
result:
wrong answer 1st lines differ - expected: '999869740', found: '711068857'