Submission #477617

#	Time	Username	Problem	Language	Result	Execution time	Memory
477617		lovrot	Plus Minus (BOI17_plusminus)	C++11	0 / 100	1 ms	208 KiB

plusminus

#include <bits/stdc++.h> 

#define X first
#define Y second
#define ll long long 

using namespace std; 

const int MOD = 1e9 + 7; 

vector<pair< int, int >> l, c;

int power(int x, int exp){ 
	int out = 1;
	int mult = x; 

	while(exp){ 
		if(exp & 1)
			out = ((ll) out * x) % MOD;

		x = ((ll) x * x) % MOD;

		exp /= 2;
	}
	return out;
}

int count(vector< pair<int, bool> > &r, vector< pair<int, bool> > &s, int rn, int sn, int n){ 

	map<int, bool> m; 

	for(int i = 0; i < n; i ++){ 
		int x = r[i].X;
		int y = s[i].X;

		bool sign = r[i].Y;

		if(!m.count(y)) m[y] = (x & 1) | sign;
		else if (m[y] != ((x & 1) | sign))	
			return 0;
	}

	return power(2, sn - m.size());
}

int main(){ 
	ios_base::sync_with_stdio(false);

	int rn, sn, n;

	cin >> rn >> sn;

	cin >> n; 

	bool board1 = true;
	bool board2 = true;

	vector<pair< int, bool >> r, s; 

	for(int i = 0; i < n; i ++){ 
		int x, y; 
		char c;

		cin >> c >> x >> y; x--; y--; 

		bool sign = (c == '+');

		board1 &= (!(!(x & 1) ^ !(y & 1)) ^ sign);
		board2 &= (!(!(x & 1) ^ !(y & 1)) ^ !sign);		
		
		r.push_back({x, sign});
		s.push_back({y, sign});	
	}
	//cout << "check: "<< (pow(2, 3) == 8) << "\n";
	cout << count(r, s, rn, sn, n) + count(s, r, sn, rn, n) - board1 - board2;
	return 0;
}

Compilation message (stderr)

plusminus.cpp: In function 'int power(int, int)':
plusminus.cpp:15:6: warning: unused variable 'mult' [-Wunused-variable]
   15 |  int mult = x;
      |      ^~~~

• Subtask 1: 0 / 12
• Subtask 2: 0 / 42
• Subtask 3: 0 / 46