| # | 제출 시각 | 아이디 | 문제 | 언어 | 결과 | 실행 시간 | 메모리 |
|---|---|---|---|---|---|---|---|
| 90097 | Atashka01 | Chessboard (IZhO18_chessboard) | C++11 | 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.
//Euzibillahiminesseytanirracim Bismillahirrahmanirrahim
/*
ID:
TASK:
LANG: C++
*/
#include <bits/stdc++.h>
#define pb push_back
#define ll long long
#define ff first
#define ss second
#define mp make_pair
#define PII pair<int,int>
#define inf 1000000001
using namespace std;
int n, m, ans = inf , r;
double l;
PII d[100001];
vector<int>v;
void f(int x1,int y1,int x2,int y2){
for(auto x:v){
x *= 2;
if( (x1%x < x/2 && y1%x < x/2) || (x1%x >= x/2 && y1%x >= x/2) ){
d[x].ff--;
d[x].ss++;
}
else{
d[x].ff++;
d[x].ss--;
}
}
}
int x1, y1, x2, y2;
int main()
{
cin>>n>>m;
v.pb(1);
for(int i=2;i<=sqrt(n);i++) if(n%i == 0){
v.pb(i);
v.pb(n/i);
}
r = sqrt(n);
l = sqrt(n);
if(l == r) v.pop_back();
for(auto x:v){
d[x].ff = (( (n/x)*(n/x) )/ 2 + ( (n/x)*(n/x) )% 2 ) * x*x;
d[x].ss = n*n - d[x].ff;
}
while(m--){
cin>>x1>>y1>>x2>>y2;
f(x1 - 1,y1 - 1,x2 - 1,y2 - 1);
}
for(auto x:v){
ans = min(ans , min( d[x].ff , d[x].ss ));
}
cout<<ans;
}
/*
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_____o8BBBBBBBBBBB BBBBBBBBB8 o88o
___o8BBBBBB**8BBBB BBBBBBBBBB oBBBBBBBo
__oBBBBBBB* *** BBBBBBBBBB BBBBBBBBBBo
_8BBBBBBBBBBooooo *BBBBBBB8 *BB* 8BBBBBBo
_8BBBBBBBBBBBBBBBB8ooBBBBBBB8 8BBBBBBB8
__*BBBBBBBBBBBBBBBBBBBBBBBBBB8 o88BB88BBBBBBBBBBBB
____*BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB8
______**8BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB*
___________*BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB8*
____________*BBBBBBBBBBBBBBBBBBBBBBBB8888**
_____________BBBBBBBBBBBBBBBBBBBBBBB*
_____________*BBBBBBBBBBBBBBBBBBBBB*
______________*BBBBBBBBBBBBBBBBBB8
_______________*BBBBBBBBBBBBBBBB*
________________8BBBBBBBBBBBBBBB8
_________________8BBBBBBBBBBBBBBBo
__________________BBBBBBBBBBBBBBB8
__________________BBBBBBBBBBBBBBBB
__________________8BBBBBBBBBBBBBBB8
__________________*BBBBBBBBBBBBBBBB
__________________8BBBBBBBBBBBBBBBB8
_________________oBBBBBBBBBBBBBBBBBB
________________oBBBBBBBBBBBBBBBBBBB
________________BBBBBBBBBBBBBBBBBBBB
_______________8BBBBBBBBBBBBBBBBBBB8
______________oBBBBBBBBB88BBBBBBBBB8
______________8BBBBBBBBB*8BBBBBBBBB*
______________BBBBBBBBB* BBBBBBBBB8
______________BBBBBBBB8 oBBBBBBBBB*
______________8BBBBBBB oBBBBBBBB*
______________BBBBBBB* 8BBBBBBB*
_____________8BBBBBB* BBBBBBB*
____________8BBBBBB8 oBBBBBB8
___________8BBBBBB8 8BBBBBB*
__________oBBBBBB8 BBBBBBB8
__________BBBBBBB8 BBBBBBBB*
_________oBBBBBBB8 BBBBBBBB
_________8BBBBBB8 BBBBBBB*
_________BBBBBB* 8BBBBB*
________oBBBB8 BBBBB*
________oBBB8 BBBB*
________BBBB8 8BBBBo
_______8BBBB* oBBBBBBo
______8BBBB* *BBBBBBBB8o
______BBBBB* *88BBBo
*/
컴파일 시 표준 에러 (stderr) 메시지
chessboard.cpp:50:9: error: 'int y1' redeclared as different kind of symbol
int x1, y1, x2, y2;
^~
In file included from /usr/include/features.h:367:0,
from /usr/include/x86_64-linux-gnu/c++/7/bits/os_defines.h:39,
from /usr/include/x86_64-linux-gnu/c++/7/bits/c++config.h:533,
from /usr/include/c++/7/cassert:43,
from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:33,
from chessboard.cpp:9:
/usr/include/x86_64-linux-gnu/bits/mathcalls.h:251:1: note: previous declaration 'double y1(double)'
__MATHCALL (y1,, (_Mdouble_));
^
chessboard.cpp: In function 'int main()':
chessboard.cpp:81:10: error: no match for 'operator>>' (operand types are 'std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}' and 'double(double) throw ()')
cin>>x1>>y1>>x2>>y2;
~~~~~~~^~~~
In file included from /usr/include/c++/7/sstream:38:0,
from /usr/include/c++/7/complex:45,
from /usr/include/c++/7/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
from chessboard.cpp:9:
/usr/include/c++/7/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>] <near match>
operator>>(__istream_type& (*__pf)(__istream_type&))
^~~~~~~~
/usr/include/c++/7/istream:120:7: note: conversion of argument 1 would be ill-formed:
chessboard.cpp:81:12: error: invalid conversion from 'double (*)(double) throw ()' to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&) {aka std::basic_istream<char>& (*)(std::basic_istream<char>&)}' [-fpermissive]
cin>>x1>>y1>>x2>>y2;
^~
In file included from /usr/include/c++/7/sstream:38:0,
from /usr/include/c++/7/complex:45,
from /usr/include/c++/7/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
from chessboard.cpp:9:
/usr/include/c++/7/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>] <near match>
operator>>(__ios_type& (*__pf)(__ios_type&))
^~~~~~~~
/usr/include/c++/7/istream:124:7: note: conversion of argument 1 would be ill-formed:
chessboard.cpp:81:12: error: invalid conversion from 'double (*)(double) throw ()' to 'std::basic_istream<char>::__ios_type& (*)(std::basic_istream<char>::__ios_type&) {aka std::basic_ios<char>& (*)(std::basic_ios<char>&)}' [-fpermissive]
cin>>x1>>y1>>x2>>y2;
^~
In file included from /usr/include/c++/7/sstream:38:0,
from /usr/include/c++/7/complex:45,
from /usr/include/c++/7/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
from chessboard.cpp:9:
/usr/include/c++/7/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>] <near match>
operator>>(ios_base& (*__pf)(ios_base&))
^~~~~~~~
/usr/include/c++/7/istream:131:7: note: conversion of argument 1 would be ill-formed:
chessboard.cpp:81:12: error: invalid conversion from 'double (*)(double) throw ()' to 'std::ios_base& (*)(std::ios_base&)' [-fpermissive]
cin>>x1>>y1>>x2>>y2;
^~
In file included from /usr/include/c++/7/sstream:38:0,
from /usr/include/c++/7/complex:45,
from /usr/include/c++/7/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
from chessboard.cpp:9:
/usr/include/c++/7/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>] <near match>
operator>>(bool& __n)
^~~~~~~~
/usr/include/c++/7/istream:168:7: note: conversion of argument 1 would be ill-formed:
chessboard.cpp:81:12: warning: the address of 'double y1(double)' will never be NULL [-Waddress]
cin>>x1>>y1>>x2>>y2;
^~
chessboard.cpp:81:12: error: cannot bind non-const lvalue reference of type 'bool&' to an rvalue of type 'bool'
In file included from /usr/include/c++/7/sstream:38:0,
from /usr/include/c++/7/complex:45,
from /usr/include/c++/7/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
from chessboard.cpp:9:
/usr/include/c++/7/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>] <near match>
operator>>(short& __n);
^~~~~~~~
/usr/include/c++/7/istream:172:7: note: conversion of argument 1 would be ill-formed:
chessboard.cpp:81:12: error: invalid conversion from 'double (*)(double) throw ()' to 'short int' [-fpermissive]
cin>>x1>>y1>>x2>>y2;
^~
chessboard.cpp:81:12: error: cannot bind rvalue '(short int)y1' to 'short int&'
In file included from /usr/include/c++/7/sstream:38:0,
from /usr/include/c++/7/complex:45,
from /usr/include/c++/7/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
from chessboard.cpp:9:
/usr/include/c++/7/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>] <near match>
operator>>(unsigned short& __n)
^~~~~~~~
/usr/include/c++/7/istream:175:7: note: conversion of argument 1 would be ill-formed:
chessboard.cpp:81:12: error: invalid conversion from 'double (*)(double) throw ()' to 'short unsigned int' [-fpermissive]
cin>>x1>>y1>>x2>>y2;
^~
chessboard.cpp:81:12: error: cannot bind rvalue '(short unsigned int)y1' to 'short unsigned int&'
In file included from /usr/include/c++/7/sstream:38:0,
from /usr/include/c++/7/complex:45,
from /usr/include/c++/7/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
from chessboard.cpp:9:
/usr/include/c++/7/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>] <near match>
operator>>(int& __n);
^~~~~~~~
/usr/include/c++/7/istream:179:7: note: conversion of argument 1 would be ill-formed:
chessboard.cpp:81:12: error: invalid conversion from 'double (*)(double) throw ()' to 'int' [-fpermissive]
cin>>x1>>y1>>x2>>y2;
^~
chessboard.cpp:81:12: error: cannot bind rvalue '(int)y1' to 'int&'
In file included from /usr/include/c++/7/sstream:38:0,
from /usr/include/c++/7/complex:45,
from /usr/include/c++/7/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
from chessboard.cpp:9:
/usr/include/c++/7/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>] <near match>
operator>>(unsigned int& __n)
^~~~~~~~
/usr/include/c++/7/istream:182:7: note: conversion of argument 1 would be ill-formed:
chessboard.cpp:81:12: error: invalid conversion from 'double (*)(double) throw ()' to 'unsigned int' [-fpermissive]
cin>>x1>>y1>>x2>>y2;
^~
chessboard.cpp:81:12: error: cannot bind rvalue '(unsigned int)y1' to 'unsigned int&'
In file included from /usr/include/c++/7/sstream:38:0,
from /usr/include/c++/7/complex:45,
from /usr/include/c++/7/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
from chessboard.cpp:9:
/usr/include/c++/7/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>] <near match>
operator>>(long& __n)
^~~~~~~~
/usr/include/c++/7/istream:186:7: note: conversion of argument 1 would be ill-formed:
chessboard.cpp:81:12: error: invalid conversion from 'double (*)(double) throw ()' to 'long int' [-fpermissive]
cin>>x1>>y1>>x2>>y2;
^~
chessboard.cpp:81:12: error: cannot bind rvalue '(long int)y1' to 'long int&'
In file included from /usr/include/c++/7/sstream:38:0,
from /usr/include/c++/7/complex:45,
from /usr/include/c++/7/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
from chessboard.cpp:9:
/usr/include/c++/7/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>] <near match>
operator>>(unsigned long& __n)
^~~~~~~~
/usr/include/c++/7/istream:190:7: note: conversion of argument 1 would be ill-formed:
chessboard.cpp:81:12: error: invalid conversion from 'double (*)(double) throw ()' to 'long unsigned int' [-fpermissive]
cin>>x1>>y1>>x2>>y2;
^~
chessboard.cpp:81:12: error: cannot bind rvalue '(long unsigned int)y1' to 'long unsigned int&'
In file included from /usr/include/c++/7/sstream:38:0,
from /usr/include/c++/7/complex:45,
from /usr/include/c++/7/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
from chessboard.cpp:9:
/usr/include/c++/7/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>] <near match>
operator>>(long long& __n)
^~~~~~~~
/usr/include/c++/7/istream:195:7: note: conversion of argument 1 would be ill-formed:
chessboard.cpp:81:12: error: invalid conversion from 'double (*)(double) throw ()' to 'long long int' [-fpermissive]
cin>>x1>>y1>>x2>>y2;
^~
chessboard.cpp:81:12: error: cannot bind rvalue '(long long int)y1' to 'long long int&'
In file included from /usr/include/c++/7/sstream:38:0,
from /usr/include/c++/7/complex:45,
from /usr/include/c++/7/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
from chessboard.cpp:9:
/usr/include/c++/7/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>] <near match>
operator>>(unsigned long long& __n)
^~~~~~~~
/usr/include/c++/7/istream:199:7: note: conversion of argument 1 would be ill-formed:
chessboard.cpp:81:12: error: invalid conversion from 'double (*)(double) throw ()' to 'long long unsigned int' [-fpermissive]
cin>>x1>>y1>>x2>>y2;
^~
chessboard.cpp:81:12: error: cannot bind rvalue '(long long unsigned int)y1' to 'long long unsigned int&'
In file included from /usr/include/c++/7/sstream:38:0,
from /usr/include/c++/7/complex:45,
from /usr/include/c++/7/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
from chessboard.cpp:9:
/usr/include/c++/7/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>] <near match>
operator>>(void*& __p)
^~~~~~~~
/usr/include/c++/7/istream:235:7: note: conversion of argument 1 would be ill-formed:
chessboard.cpp:81:12: error: invalid conversion from 'double (*)(double) throw ()' to 'void*' [-fpermissive]
cin>>x1>>y1>>x2>>y2;
^~
chessboard.cpp:81:12: error: cannot bind rvalue '(void*)y1' to 'void*&'
In file included from /usr/include/c++/7/sstream:38:0,
from /usr/include/c++/7/complex:45,
from /usr/include/c++/7/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
from chessboard.cpp:9:
/usr/include/c++/7/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>]
operator>>(float& __f)
^~~~~~~~
/usr/include/c++/7/istream:214:7: note: no known conversion for argument 1 from 'double(double) throw ()' to 'float&'
/usr/include/c++/7/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>]
operator>>(double& __f)
^~~~~~~~
/usr/include/c++/7/istream:218:7: note: no known conversion for argument 1 from 'double(double) throw ()' to 'double&'
/usr/include/c++/7/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>]
operator>>(long double& __f)
^~~~~~~~
/usr/include/c++/7/istream:222:7: note: no known conversion for argument 1 from 'double(double) throw ()' to 'long double&'
/usr/include/c++/7/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>]
operator>>(__streambuf_type* __sb);
^~~~~~~~
/usr/include/c++/7/istream:259:7: note: no known conversion for argument 1 from 'double(double) throw ()' to 'std::basic_istream<char>::__streambuf_type* {aka std::basic_streambuf<char>*}'
In file included from /usr/include/c++/7/string:53:0,
from /usr/include/c++/7/bits/locale_classes.h:40,
from /usr/include/c++/7/bits/ios_base.h:41,
from /usr/include/c++/7/ios:42,
from /usr/include/c++/7/istream:38,
from /usr/include/c++/7/sstream:38,
from /usr/include/c++/7/complex:45,
from /usr/include/c++/7/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
from chessboard.cpp:9:
/usr/include/c++/7/bits/basic_string.tcc:1465:5: 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, _Alloc>&)
operator>>(basic_istream<_CharT, _Traits>& __in,
^~~~~~~~
/usr/include/c++/7/bits/basic_string.tcc:1465:5: note: template argument deduction/substitution failed:
chessboard.cpp:81:12: note: mismatched types 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>' and 'double(double) throw ()'
cin>>x1>>y1>>x2>>y2;
^~
In file included from /usr/include/c++/7/istream:991:0,
from /usr/include/c++/7/sstream:38,
from /usr/include/c++/7/complex:45,
from /usr/include/c++/7/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
from chessboard.cpp:9:
/usr/include/c++/7/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*)
operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
^~~~~~~~
/usr/include/c++/7/bits/istream.tcc:963:5: note: template argument deduction/substitution failed:
chessboard.cpp:81:12: note: deduced conflicting types for parameter '_CharT2' ('char' and 'double(double) throw ()')
cin>>x1>>y1>>x2>>y2;
^~
In file included from /usr/include/c++/7/istream:991:0,
from /usr/include/c++/7/sstream:38,
from /usr/include/c++/7/complex:45,
from /usr/include/c++/7/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
from chessboard.cpp:9:
/usr/include/c++/7/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&)
operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
^~~~~~~~
/usr/include/c++/7/bits/istream.tcc:931:5: note: template argument deduction/substitution failed:
chessboard.cpp:81:12: note: deduced conflicting types for parameter '_CharT' ('char' and 'double(double) throw ()')
cin>>x1>>y1>>x2>>y2;