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Submission #132720

# Submission time Handle Problem Language Result Execution time Memory
132720 2019-07-19T11:50:50 Z youngyojun Plus Minus (BOI17_plusminus) C++11
100 / 100
 66 ms 3704 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

const int MOD = 1000000007;
const int MAXN = 100055;

ll pw(ll n, ll k) {
	ll r = 1; for(; k; k >>= 1) {
		if(k&1) r = n * r % MOD;
		n = n * n % MOD;
	}
	return r;
}

int O[MAXN];
int A[MAXN], B[MAXN];
bitset<MAXN> C;

ll Ans;
int H, W, N;

void process() {
	iota(O, O+N+1, 0);
	sort(O+1, O+N+1, [&](int a, int b) {
		return A[a] < A[b];
	});

	int cnt = 0;
	for(int s = 1, e; s <= N; cnt++, s = e) {
		for(e = s+1; e <= N && A[O[e]] == A[O[s]]; e++);
		bool isOdd = false, isEven = false;
		for(int oi = s, i, t; oi < e; oi++) {
			i = O[oi];
			t = A[i] + B[i] + (C[i] ? 1 : 0);
			((t&1) ? isOdd : isEven) = true;
		}
		if(isOdd && isEven) return;
	}
	Ans += pw(2, H-cnt);
	if(MOD <= Ans) Ans -= MOD;
}

void minusOne() {
	bool isOdd = false, isEven = false;
	for(int i = 1, t; i <= N; i++) {
		t = A[i] + B[i] + (C[i] ? 1 : 0);
		((t&1) ? isOdd : isEven) = true;
	}
	if(isOdd != isEven) Ans--;
	if(Ans < 0) Ans = MOD-1;
}

int main() {
	scanf("%d%d%d", &H, &W, &N);
	for(int i = 1; i <= N; i++) {
		char c;
		scanf(" %c%d%d", &c, &A[i], &B[i]);
		C[i] = '+' == c;
	}
	if(!N) {
		cout << (pw(2, H) + pw(2, W) - 2) % MOD << endl;
		return 0;
	}

	process();
	swap(H, W);
	for(int i = 1; i <= N; i++) swap(A[i], B[i]);
	process();
	
	minusOne();

	cout << Ans << endl;
	return 0;
}

Compilation message

plusminus.cpp: In function 'int main()':
plusminus.cpp:55:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d", &H, &W, &N);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~
plusminus.cpp:58:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf(" %c%d%d", &c, &A[i], &B[i]);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 3 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 380 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 376 KB Output is correct

Subtask #2
42.0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 3 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 380 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 376 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 256 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 3 ms 376 KB Output is correct
15 Correct 2 ms 376 KB Output is correct
16 Correct 44 ms 2476 KB Output is correct
17 Correct 43 ms 2552 KB Output is correct
18 Correct 43 ms 2424 KB Output is correct
19 Correct 45 ms 2428 KB Output is correct
20 Correct 45 ms 2424 KB Output is correct

Subtask #3
46.0 / 46.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 3 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 380 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 376 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 256 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 3 ms 376 KB Output is correct
15 Correct 2 ms 376 KB Output is correct
16 Correct 44 ms 2476 KB Output is correct
17 Correct 43 ms 2552 KB Output is correct
18 Correct 43 ms 2424 KB Output is correct
19 Correct 45 ms 2428 KB Output is correct
20 Correct 45 ms 2424 KB Output is correct
21 Correct 56 ms 2932 KB Output is correct
22 Correct 2 ms 256 KB Output is correct
23 Correct 53 ms 2780 KB Output is correct
24 Correct 52 ms 2936 KB Output is correct
25 Correct 53 ms 2808 KB Output is correct
26 Correct 55 ms 3064 KB Output is correct
27 Correct 54 ms 3064 KB Output is correct
28 Correct 55 ms 3064 KB Output is correct
29 Correct 55 ms 3108 KB Output is correct
30 Correct 66 ms 3704 KB Output is correct