| # | 제출 시각 | 아이디 | 문제 | 언어 | 결과 | 실행 시간 | 메모리 |
|---|---|---|---|---|---|---|---|
| 865273 | vjudge1 | 새로운 문제 (POI11_met) | C++17 | 컴파일 에러 | 0 ms | 0 KiB |
이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
/*
(( `'-""``""-'` ))
)-__-_.._-__-(
/ --- (o _ o) --- \
\ .-* ( .0. ) *-. /
_'-. ,_ '=' _, .-'_
/ `;#'#'# - #'#'#;` \
\_)) -----'#'----- ((_/
# --------- #
'# ------- #'
/..-'# ------- #'-.\
_\...-\'# -- #'/-.../_
((____)- '#' -(____))
art by - Vinni01 / luchi abi
cout << fixed << setprecision(6) << x;
freopen ( "sum.in", "r", stdin )
*/
#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimization("unroll-loops")
#include <map>
#include <set>
#include <list>
#include <cmath>
#include <ctime>
#include <deque>
#include <queue>
#include <stack>
#include <string>
#include <bitset>
#include <cstdio>
#include <limits>
#include <vector>
#include <climits>
#include <cstring>
#include <cstdlib>
#include <fstream>
#include <numeric>
#include <sstream>
#include <cassert>
#include <iomanip>
#include <iostream>
#include <algorithm>
#include <stdio.h>
#include <fstream>
#include <unordered_map>
using namespace std ;
#define ll int
#define ff first
#define ss second
#define pb push_back
#define pf push_front
#define UseOFF ios_base::sync_with_stdio(0);cin.tie(0), cout.tie(0)
#define sz size
#define ins insert
#define new jweijofdg
const ll N = 3e5 + 111 ;
const ll k = 400 ;
ll sum[ N ] ;
ll a[ N ] ;
map < ll, ll > p[ N ] ;
map < ll, ll > cnt[ N ] ;
map < ll, ll > ANS[ N ] ;
signed main()
{
UseOFF ;
ll n, m ;
cin >> n >> m ;
for( int i = 1 ; i <= m ; i++ )
{
cin >> a[ i ] ;
}
for( int i = 1 ; i <= n ; i++ ) { cin >> p[ i ] ; ANS[ i ] = 1e9 ; }
ll q ;
cin >> q ;
for( int i = 1 ; i <= q ; i++ )
{
ll l, r, x ;
cin >> l >> r >> x ;
ll r2 = r ;
if( l > r )
{
r = m ;
}
for( int j = l ; j <= r ; j++ )
{
cnt[ a[ j ] ] += x ;
//if( a[ j ] == 3 )cout << cnt[ a[ j ] ] << " " << p[ a[ j ] ] << " " << a[ j ] << " " << i << " " << x << '\n' ;
if( cnt[ a[ j ] ] >= p[ a[ j ] ] )
{
ANS[ a[ j ] ] = min( ANS[ a[ j ] ], i ) ;
}
}
if( l > r2 )
{
for( int j = 1 ; j <= r2 ; j++ )
{
cnt[ a[ j ] ] += x ;
//if( a[ j ] == 3 )cout << cnt[ a[ j ] ] << " " << p[ a[ j ] ] << " " << a[ j ] << " " << i << " " << x << '\n' ;
if( cnt[ a[ j ] ] >= p[ a[ j ] ] )
{
ANS[ a[ j ] ] = min( ANS[ a[ j ] ], i ) ;
}
}
}
}
for( int i = 1 ; i <= n ; i++ )
{
if( ANS[ i ] == 1e9 ) { cout << "NIE\n" ; continue ; }
cout << ANS[ i ] << '\n' ;
}
}
컴파일 시 표준 에러 (stderr) 메시지
met.cpp:21: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
21 | #pragma GCC optimization("unroll-loops")
|
met.cpp: In function 'int main()':
met.cpp:74:43: error: no match for 'operator>>' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and 'std::map<int, int>')
74 | for( int i = 1 ; i <= n ; i++ ) { cin >> p[ i ] ; ANS[ i ] = 1e9 ; }
| ~~~ ^~ ~~~~~~
| | |
| | std::map<int, int>
| std::istream {aka std::basic_istream<char>}
In file included from /usr/include/c++/10/fstream:38,
from met.cpp:38:
/usr/include/c++/10/istream:120:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>::__istream_type& (*)(std::basic_istream<_CharT, _Traits>::__istream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]'
120 | operator>>(__istream_type& (*__pf)(__istream_type&))
| ^~~~~~~~
/usr/include/c++/10/istream:120:36: note: no known conversion for argument 1 from 'std::map<int, int>' to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)' {aka 'std::basic_istream<char>& (*)(std::basic_istream<char>&)'}
120 | operator>>(__istream_type& (*__pf)(__istream_type&))
| ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/10/istream:124:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>::__ios_type& (*)(std::basic_istream<_CharT, _Traits>::__ios_type&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>; std::basic_istream<_CharT, _Traits>::__ios_type = std::basic_ios<char>]'
124 | operator>>(__ios_type& (*__pf)(__ios_type&))
| ^~~~~~~~
/usr/include/c++/10/istream:124:32: note: no known conversion for argument 1 from 'std::map<int, int>' to 'std::basic_istream<char>::__ios_type& (*)(std::basic_istream<char>::__ios_type&)' {aka 'std::basic_ios<char>& (*)(std::basic_ios<char>&)'}
124 | operator>>(__ios_type& (*__pf)(__ios_type&))
| ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
/usr/include/c++/10/istream:131:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::ios_base& (*)(std::ios_base&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]'
131 | operator>>(ios_base& (*__pf)(ios_base&))
| ^~~~~~~~
/usr/include/c++/10/istream:131:30: note: no known conversion for argument 1 from 'std::map<int, int>' to 'std::ios_base& (*)(std::ios_base&)'
131 | operator>>(ios_base& (*__pf)(ios_base&))
| ~~~~~~~~~~~~^~~~~~~~~~~~~~~~
/usr/include/c++/10/istream:168:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(bool&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]'
168 | operator>>(bool& __n)
| ^~~~~~~~
/usr/include/c++/10/istream:168:24: note: no known conversion for argument 1 from 'std::map<int, int>' to 'bool&'
168 | operator>>(bool& __n)
| ~~~~~~^~~
/usr/include/c++/10/istream:172:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(short int&) [with _CharT = char; _Traits = std::char_traits<char>]'
172 | operator>>(short& __n);
| ^~~~~~~~
/usr/include/c++/10/istream:172:25: note: no known conversion for argument 1 from 'std::map<int, int>' to 'short int&'
172 | operator>>(short& __n);
| ~~~~~~~^~~
/usr/include/c++/10/istream:175:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(short unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]'
175 | operator>>(unsigned short& __n)
| ^~~~~~~~
/usr/include/c++/10/istream:175:34: note: no known conversion for argument 1 from 'std::map<int, int>' to 'short unsigned int&'
175 | operator>>(unsigned short& __n)
| ~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/istream:179:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(int&) [with _CharT = char; _Traits = std::char_traits<char>]'
179 | operator>>(int& __n);
| ^~~~~~~~
/usr/include/c++/10/istream:179:23: note: no known conversion for argument 1 from 'std::map<int, int>' to 'int&'
179 | operator>>(int& __n);
| ~~~~~^~~
/usr/include/c++/10/istream:182:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]'
182 | operator>>(unsigned int& __n)
| ^~~~~~~~
/usr/include/c++/10/istream:182:32: note: no known conversion for argument 1 from 'std::map<int, int>' to 'unsigned int&'
182 | operator>>(unsigned int& __n)
| ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/istream:186:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long int&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]'
186 | operator>>(long& __n)
| ^~~~~~~~
/usr/include/c++/10/istream:186:24: note: no known conversion for argument 1 from 'std::map<int, int>' to 'long int&'
186 | operator>>(long& __n)
| ~~~~~~^~~
/usr/include/c++/10/istream:190:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]'
190 | operator>>(unsigned long& __n)
| ^~~~~~~~
/usr/include/c++/10/istream:190:33: note: no known conversion for argument 1 from 'std::map<int, int>' to 'long unsigned int&'
190 | operator>>(unsigned long& __n)
| ~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/istream:195:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long int&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]'
195 | operator>>(long long& __n)
| ^~~~~~~~
/usr/include/c++/10/istream:195:29: note: no known conversion for argument 1 from 'std::map<int, int>' to 'long long int&'
195 | operator>>(long long& __n)
| ~~~~~~~~~~~^~~
/usr/include/c++/10/istream:199:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]'
199 | operator>>(unsigned long long& __n)
| ^~~~~~~~
/usr/include/c++/10/istream:199:38: note: no known conversion for argument 1 from 'std::map<int, int>' to 'long long unsigned int&'
199 | operator>>(unsigned long long& __n)
| ~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/istream:214:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(float&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]'
214 | operator>>(float& __f)
| ^~~~~~~~
/usr/include/c++/10/istream:214:25: note: no known conversion for argument 1 from 'std::map<int, int>' to 'float&'
214 | operator>>(float& __f)
| ~~~~~~~^~~
/usr/include/c++/10/istream:218:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(double&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]'
218 | operator>>(double& __f)
| ^~~~~~~~
/usr/include/c++/10/istream:218:26: note: no known conversion for argument 1 from 'std::map<int, int>' to 'double&'
218 | operator>>(double& __f)
| ~~~~~~~~^~~
/usr/include/c++/10/istream:222:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long double&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]'
222 | operator>>(long double& __f)
| ^~~~~~~~
/usr/include/c++/10/istream:222:31: note: no known conversion for argument 1 from 'std::map<int, int>' to 'long double&'
222 | operator>>(long double& __f)
| ~~~~~~~~~~~~~^~~
/usr/include/c++/10/istream:235:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(void*&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]'
235 | operator>>(void*& __p)
| ^~~~~~~~
/usr/include/c++/10/istream:235:25: note: no known conversion for argument 1 from 'std::map<int, int>' to 'void*&'
235 | operator>>(void*& __p)
| ~~~~~~~^~~
/usr/include/c++/10/istream:259:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>::__streambuf_type*) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__streambuf_type = std::basic_streambuf<char>]'
259 | operator>>(__streambuf_type* __sb);
| ^~~~~~~~
/usr/include/c++/10/istream:259:36: note: no known conversion for argument 1 from 'std::map<int, int>' to 'std::basic_istream<char>::__streambuf_type*' {aka 'std::basic_streambuf<char>*'}
259 | operator>>(__streambuf_type* __sb);
| ~~~~~~~~~~~~~~~~~~^~~~
In file included from /usr/include/c++/10/string:56,
from met.cpp:30:
/usr/include/c++/10/bits/basic_string.tcc:1476:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::__cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
1476 | operator>>(basic_istream<_CharT, _Traits>& __in,
| ^~~~~~~~
/usr/include/c++/10/bits/basic_string.tcc:1476:5: note: template argument deduction/substitution failed:
met.cpp:74:51: note: 'std::map<int, int>' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
74 | for( int i = 1 ; i <= n ; i++ ) { cin >> p[ i ] ; ANS[ i ] = 1e9 ; }
| ^
In file included from met.cpp:31:
/usr/include/c++/10/bitset:1472:5: note: candidate: 'template<class _CharT, class _Traits, long unsigned int _Nb> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::bitset<_Nb>&)'
1472 | operator>>(std::basic_istream<_CharT, _Traits>& __is, bitset<_Nb>& __x)
| ^~~~~~~~
/usr/include/c++/10/bitset:1472:5: note: template argument deduction/substitution failed:
met.cpp:74:51: note: 'std::map<int, int>' is not derived from 'std::bitset<_Nb>'
74 | for( int i = 1 ; i <= n ; i++ ) { cin >> p[ i ] ; ANS[ i ] = 1e9 ; }
| ^
In file included from /usr/include/c++/10/istream:991,
from /usr/include/c++/10/fstream:38,
from met.cpp:38:
/usr/include/c++/10/bits/istream.tcc:931:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT&)'
931 | operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
| ^~~~~~~~
/usr/include/c++/10/bits/istream.tcc:931:5: note: template argument deduction/substitution failed:
met.cpp:74:51: note: deduced conflicting types for parameter '_CharT' ('char' and 'std::map<int, int>')
74 | for( int i = 1 ; i <= n ; i++ ) { cin >> p[ i ] ; ANS[ i ] = 1e9 ; }
| ^
In file included from /usr/include/c++/10/fstream:38,
from met.cpp:38:
/usr/include/c++/10/istream:756:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, unsigned char&)'
756 | operator>>(basic_istream<char, _Traits>& __in, unsigned char& __c)
| ^~~~~~~~
/usr/include/c++/10/istream:756:5: note: template argument deduction/substitution failed:
met.cpp:74:51: note: cannot convert 'p[i]' (type 'std::map<int, int>') to type 'unsigned char&'
74 | for( int i = 1 ; i <= n ; i++ ) { cin >> p[ i ] ; ANS[ i ] = 1e9 ; }
| ~~~~~^
In file included from /usr/include/c++/10/fstream:38,
from met.cpp:38:
/usr/include/c++/10/istream:761:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, signed char&)'
761 | operator>>(basic_istream<char, _Traits>& __in, signed char& __c)
| ^~~~~~~~
/usr/include/c++/10/istream:761:5: note: template argument deduction/substitution failed:
met.cpp:74:51: note: cannot convert 'p[i]' (type 'std::map<int, int>') to type 'signed char&'
74 | for( int i = 1 ; i <= n ; i++ ) { cin >> p[ i ] ; ANS[ i ] = 1e9 ; }
| ~~~~~^
In file included from /usr/include/c++/10/istream:991,
from /usr/include/c++/10/fstream:38,
from met.cpp:38:
/usr/include/c++/10/bits/istream.tcc:963:5: note: candidate: 'template<class _CharT2, class _Traits2> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT2*)'
963 | operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
| ^~~~~~~~
/usr/include/c++/10/bits/istream.tcc:963:5: note: template argument deduction/substitution failed:
met.cpp:74:51: note: mismatched types '_CharT2*' and 'std::map<int, int>'
74 | for( int i = 1 ; i <= n ; i++ ) { cin >> p[ i ] ; ANS[ i ] = 1e9 ; }
| ^
In file included from /usr/include/c++/10/fstream:38,
from met.cpp:38:
/usr/include/c++/10/istream:803:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, unsigned char*)'
803 | operator>>(basic_istream<char, _Traits>& __in, unsigned char* __s)
| ^~~~~~~~
/usr/include/c++/10/istream:803:5: note: template argument deduction/substitution failed:
met.cpp:74:51: note: cannot convert 'p[i]' (type 'std::map<int, int>') to type 'unsigned char*'
74 | for( int i = 1 ; i <= n ; i++ ) { cin >> p[ i ] ; ANS[ i ] = 1e9 ; }
| ~~~~~^
In file included from /usr/include/c++/10/fstream:38,
from met.cpp:38:
/usr/include/c++/10/istream:808:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, signed char*)'
808 | operator>>(basic_istream<char, _Traits>& __in, signed char* __s)
| ^~~~~~~~
/usr/include/c++/10/istream:808:5: note: template argument deduction/substitution failed:
met.cpp:74:51: note: cannot convert 'p[i]' (type 'std::map<int, int>') to type 'signed char*'
74 | for( int i = 1 ; i <= n ; i++ ) { cin >> p[ i ] ; ANS[ i ] = 1e9 ; }
| ~~~~~^
In file included from /usr/include/c++/10/fstream:38,
from met.cpp:38:
/usr/include/c++/10/istream:980:5: note: candidate: 'template<class _Istream, class _Tp> typename std::enable_if<std::__and_<std::__not_<std::is_lvalue_reference<_Tp> >, std::__is_convertible_to_basic_istream<_Istream>, std::__is_extractable<typename std::__is_convertible_to_basic_istream<_Tp>::__istream_type, _Tp&&, void> >::value, typename std::__is_convertible_to_basic_istream<_Tp>::__istream_type>::type std::operator>>(_Istream&&, _Tp&&)'
980 | operator>>(_Istream&& __is, _Tp&& __x)
| ^~~~~~~~
/usr/include/c++/10/istream:980:5: note: template argument deduction/substitution failed:
/usr/include/c++/10/istream: In substitution of 'template<class _Istream, class _Tp> typename std::enable_if<std::__and_<std::__not_<std::is_lvalue_reference<_Tp> >, std::__is_convertible_to_basic_istream<_Istream>, std::__is_extractable<typename std::__is_convertible_to_basic_istream<_Tp>::__istream_type, _Tp&&, void> >::value, typename std::__is_convertible_to_basic_istream<_Tp>::__istream_type>::type std::operator>>(_Istream&&, _Tp&&) [with _Istream = std::basic_istream<char>&; _Tp = std::map<int, int>&]':
met.cpp:74:51: required from here
/usr/include/c++/10/istream:980:5: error: no type named 'type' in 'struct std::enable_if<false, std::basic_istream<char>&>'
In file included from met.cpp:42:
/usr/include/c++/10/iomanip:71:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::_Resetiosflags)'
71 | operator>>(basic_istream<_CharT, _Traits>& __is, _Resetiosflags __f)
| ^~~~~~~~
/usr/include/c++/10/iomanip:71:5: note: template argument deduction/substitution failed:
met.cpp:74:51: note: cannot convert 'p[i]' (type 'std::map<int, int>') to type 'std::_Resetiosflags'
74 | for( int i = 1 ; i <= n ; i++ ) { cin >> p[ i ] ; ANS[ i ] = 1e9 ; }
| ~~~~~^
In file included from met.cpp:42:
/usr/include/c++/10/iomanip:101:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>