結果
| 問題 |
No.180 美しいWhitespace (2)
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2017-01-06 18:53:13 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 3 ms / 5,000 ms |
| コード長 | 1,996 bytes |
| コンパイル時間 | 1,854 ms |
| コンパイル使用メモリ | 170,540 KB |
| 実行使用メモリ | 6,824 KB |
| 最終ジャッジ日時 | 2024-12-17 14:40:43 |
| 合計ジャッジ時間 | 3,059 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 31 |
コンパイルメッセージ
main.cpp: In function 'void solve()':
main.cpp:91:13: warning: 'x' may be used uninitialized [-Wmaybe-uninitialized]
91 | for( ; lb <= rb; ){
| ~~~^~~~~
main.cpp:83:6: note: 'x' was declared here
83 | ll x, min_ugliness = 1LL << 61;
| ^
ソースコード
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector< int > vi;
typedef vector< vi > vvi;
typedef vector< ll > vl;
typedef vector< vl > vvl;
typedef pair< int, int > pii;
typedef vector< pii > vp;
typedef vector< double > vd;
typedef vector< vd > vvd;
typedef vector< string > vs;
template< class T1, class T2 >
int upmin( T1 &x, T2 v ){
if( x > v ){
x = v;
return 1;
}
return 0;
}
template< class T1, class T2 >
int upmax( T1 &x, T2 v ){
if( x < v ){
x = v;
return 1;
}
return 0;
}
const int INF = 0x3f3f3f3f;
int N;
vi A, B;
void init(){
cin >> N;
A = B = vi( N );
for( int i = 0; i < N; ++i ){
cin >> A[ i ] >> B[ i ];
}
}
void preprocess(){
}
ll calc( ll x ){
ll maxv = - ( 1LL << 61 );
for( int i = 0; i < N; ++i ){
upmax( maxv, 1LL * A[ i ] + 1LL * B[ i ] * x );
}
ll minv = 1LL << 61;
for( int i = 0; i < N; ++i ){
upmin( minv, 1LL * A[ i ] + 1LL * B[ i ] * x );
}
return maxv - minv;
}
void solve(){
ll lb = 1LL, rb = ( ll ) 1e9;
for( ; rb - lb > 5; ){
ll p = ( lb * 2 + rb ) / 3;
ll q = ( lb + rb * 2 ) / 3;
ll rl = calc( lb );
ll rp = calc( p );
ll rq = calc( q );
ll rr = calc( rb );
if( rl <= rp and rp <= rq and rq <= rr ){
rb = p;
} else if( rl >= rp and rp <= rq and rq <= rr ){
rb = q;
} else if( rl >= rp and rp >= rq and rq <= rr ){
lb = p;
} else if( rl >= rp and rp >= rq and rq >= rr ){
lb = q;
} else{
assert( false );
}
}
ll x, min_ugliness = 1LL << 61;
for( ll t = lb; t <= rb; ++t ){
if( upmin( min_ugliness, calc( t ) ) ){
x = t;
}
}
lb = 1LL, rb = x;
ll ans = x;
for( ; lb <= rb; ){
ll mid = ( lb + rb ) / 2;
if( calc( mid ) == min_ugliness ){
ans = mid;
rb = mid - 1;
} else{
lb = mid + 1;
}
}
cout << ans << endl;
}
signed main(){
ios::sync_with_stdio( 0 );
init();
preprocess();
solve();
return 0;
}