Submission #1408998

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Source Code Expand

#include<bits/stdc++.h>

using lint = long long int;
using pii = std::pair<int, int>;

using std::vector;

lint combi[51][51];
lint my_pow(lint a, lint b) { //a^b
	lint ret = 1;
	while (b != 0) {
		if (b % 2 == 0) {
			a = a*a;
			b /= 2;
		}
		else {
			ret = ret * a;
			b--;
		}
	}
	return ret;
}

int main(void) {
	combi[0][0] = 1;
	for (int i = 0; i <= 50; i++) {
		combi[i][0] = 1;
		combi[i][i] = 1;
		for (int j = 1; j < i; j++) {
			combi[i][j] = combi[i - 1][j] + combi[i - 1][j - 1];
		}
	}
	int N, P;
	scanf("%d %d", &N, &P);
	int hol = 0, jak = 0;
	for (int i = 1; i <= N; i++) {
		int temp;
		scanf("%d", &temp);
		if (temp % 2 == 0) {
			jak++;
		}
		else {
			hol++;
		}
	}

	lint ans = my_pow(2, jak);
	lint temp = 0;

	if (P % 2 == 1) {
		for (int i = 1; i <= hol; i += 2) {
			temp += combi[hol][i];
		}
	}
	else {
		for (int i = 0; i <= hol; i += 2) {
			temp += combi[hol][i];
		}
	}

	ans *= temp;

	printf("%lld", ans);

	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:34:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &N, &P);
                        ^
./Main.cpp:38:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &temp);
                     ^

Judge Result