Language: C++

#include <iostream>
#include <algorithm>
#include <cstdio>
#include <math.h>
using namespace std;

int gx,gy,p,x1,x2,y1,y2,a[16][16],sw=0,n;

int main(){
	cin>>n;for(int z=0;z<n;z++){
	while(cin>>gx>>gy>>p){
		int h[16][16]={0},v[16][16]={0};
		for(int i=0;i<p;i++){
			cin>>x1>>y1>>x2>>y2;
			if(x1==x2){int M=max(y1,y2); v[x1][M]=1;}
			else {int M=max(x1,x2); h[M][y1]=1;}
		}
		for(int i=0;i<=max(gx,gy);i++){v[i][0]=1;h[0][i]=1;}
		for(int i=0;i<=gx;i++){
			for(int j=0;j<=gy;j++){
				if(v[i][j]==0&&h[i][j]==0)a[i][j]=a[i-1][j]+a[i][j-1];
				else if(v[i][j]==0)a[i][j]=a[i][j-1];
				else if(h[i][j]==0)a[i][j]=a[i-1][j];
				else {
					if(i==0&&j==0)a[i][j]=1;
					else a[i][j]=0;
				}
			}
		}
		if(a[gx][gy]>0)cout<<a[gx][gy]<<endl;
		else cout<<"Miserable Hokusai!"<<endl;
		sw=1;
	}
	}
}

Compiler output:
a.cc:7:19: error: 'int y1' redeclared as different kind of entity
    7 | int gx,gy,p,x1,x2,y1,y2,a[16][16],sw=0,n;
      |                   ^~
In file included from /usr/include/features.h:523,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/os_defines.h:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/c++config.h:683,
                 from /usr/include/c++/14/bits/requires_hosted.h:31,
                 from /usr/include/c++/14/iostream:38,
                 from a.cc:1:
/usr/include/x86_64-linux-gnu/bits/mathcalls.h:257:1: note: previous declaration 'double y1(double)'
  257 | __MATHCALL (y1,, (_Mdouble_));
      | ^~~~~~~~~~
a.cc: In function 'int main()':
a.cc:14:32: error: no match for 'operator>>' (operand types are 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} and 'double(double) noexcept')
   14 |                         cin>>x1>>y1>>x2>>y2;
      |                         ~~~~~~~^~~~
      |                            |     |
      |                            |     double(double) noexcept
      |                            std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}
In file included from /usr/include/c++/14/iostream:42:
/usr/include/c++/14/istream:170:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(bool&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  170 |       operator>>(bool& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:170:7: note:   conversion of argument 1 would be ill-formed:
a.cc:14:34: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'double (*)(double) noexcept'
   14 |                         cin>>x1>>y1>>x2>>y2;
      |                                  ^~
/usr/include/c++/14/istream:174:7: 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)
  174 |       operator>>(short& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:174:7: note:   conversion of argument 1 would be ill-formed:
a.cc:14:34: error: invalid conversion from 'double (*)(double) noexcept' to 'short int' [-fpermissive]
   14 |                         cin>>x1>>y1>>x2>>y2;
      |                                  ^~
      |                                  |
      |                                  double (*)(double) noexcept
a.cc:14:34: error: cannot bind rvalue '(short int)y1' to 'short int&'
/usr/include/c++/14/istream:177:7: 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>; __istream_type = std::basic_istream<char>]' (near match)
  177 |       operator>>(unsigned short& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:177:7: note:   conversion of argument 1 would be ill-formed:
a.cc:14:34: error: invalid conversion from 'double (*)(double) noexcept' to 'short unsigned int' [-fpermissive]
   14 |                         cin>>x1>>y1>>x2>>y2;
      |                                  ^~
      |                                  |
      |                                  double (*)(double) noexcept
a.cc:14:34: error: cannot bind rvalue '(short unsigned int)y1' to 'short unsigned int&'
/usr/include/c++/14/istream:181:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  181 |       operator>>(int& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:181:7: note:   conversion of argument 1 would be ill-formed:
a.cc:14:34: error: invalid conversion from 'double (*)(double) noexcept' to 'int' [-fpermissive]
   14 |                         cin>>x1>>y1>>x2>>y2;
      |                                  ^~
      |                                  |
      |                                  double (*)(double) noexcept
a.cc:14:34: error: cannot bind rvalue '(int)y1' to 'int&'
/usr/include/c++/14/istream:184:7: 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>; __istream_type = std::basic_istream<char>]' (near match)
  184 |       operator>>(unsigned int& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:184:7: note:   conversion of argument 1 would be ill-formed:
a.cc:14:34: error: invalid conversion from 'double (*)(double) noexcept' to 'unsigned int' [-fpermissive]
   14 |                         cin>>x1>>y1>>x2>>y2;
      |                                  ^~
      |                                  |
      |                                  double (*)(double) noexcept
a.cc:14:34: error: cannot bind rvalue '(unsigned int)y1' to 'unsigned int&'
/usr/include/c++/14/istream:188:7: 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>; __istream_type = std::basic_istream<char>]' (near match)
  188 |       operator>>(long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:188:7: note:   conversion of argument 1 would be ill-formed:
a.cc:14:34: error: invalid conversion from 'double (*)(double) noexcept' to 'long int' [-fpermissive]
   14 |                         cin>>x1>>y1>>x2>>y2;
      |                                  ^~
      |                                  |
      |                                  double (*)(double) noexcept
a.cc:14:34: error: cannot bind rvalue '(long int)y1' to 'long int&'
/usr/include/c++/14/istream:192:7: 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>; __istream_type = std::basic_istream<char>]' (near match)
  192 |       operator>>(unsigned long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:192:7: note:   conversion of argument 1 would be ill-formed:
a.cc:14:34: error: invalid conversion from 'double (*)(double) noexcept' to 'long unsigned int' [-fpermissive]
   14 |                         cin>>x1>>y1>>x2>>y2;
      |                                  ^~
      |                                  |
      |                                  double (*)(double) noexcept
a.cc:14:34: error: cannot bind rvalue '(long unsigned int)y1' to 'long unsigned int&'
/usr/include/c++/14/istream:199:7: 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>; __istream_type = std::basic_istream<char>]' (near match)
  199 |       operator>>(long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:199:7: note:   conversion of argument 1 would be ill-formed:
a.cc:14:34: error: invalid conversion from 'double (*)(double) noexcept' to 'long long int' [-fpermissive]
   14 |                         cin>>x1>>y1>>x2>>y2;
      |                                  ^~
      |                                  |
      |                                  double (*)(double) noexcept
a.cc:14:34: error: cannot bind rvalue '(long long int)y1' to 'long long int&'
/usr/include/c++/14/istream:203:7: 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>; __istream_type = std::basic_istream<char>]' (near match)
  203 |       operator>>(unsigned long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:203:7: note:   conversion of argument 1 would be ill-formed:
a.cc:14:34: error: invalid conversion from 'double (*)(double) noexcept' to 'long long unsigned int' [-fpermissive]
   14 |                         cin>>x1>>y1>>x2>>y2;
      |                                  ^~
      |                                  |
      |                                  double (*)(double) noexcept
a.cc:14:34: error: cannot bind rvalue '(long long unsigned int)y1' to 'long long unsigned int&'
/usr/include/c++/14/istream:328:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(void*&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  328 |       operator>>(void*& __p)
      |       ^~~~~~~~
/usr/include/c++/14/istream:328:7: note:   conversion of argument 1 would be ill-formed:
a.cc:14:34: error: invalid conversion from 'double (*)(double) noexcept' to 'void*' [-fpermissive]
   14 |                         cin>>x1>>y1>>x2>>y2;
      |                                  ^~
      |                                  |
      |                                  double (*)(double) noexcept
a.cc:14:34: error: cannot bind rvalue '(void*)y1' to 'void*&'
/usr/include/c++/14/istream:122:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(__istream_type& (*)(__istream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |       ^~~~~~~~
/usr/include/c++/14/istream:122:7: note:   conversion of argument 1 would be ill-formed:
a.cc:14:34: error: invalid conversion from 'double (*)(double) noexcept' to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)' {aka 'std::basic_istream<char>& (*)(std::basic_istream<char>&)'} [-fpermissive]
   14 |                         cin>>x1>>y1>>x2>>y2;
      |                                  ^~
      |                                  |
      |                                  double (*)(double) noexcept
/usr/include/c++/14/istream:126:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::ba