Submission #905990

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Source Code Expand

#include <cstdio>
#include <algorithm>
using namespace std;

static const auto NMAX = 100;

static int N, C[NMAX];

static bool solve() {
	int D;
	for(D = N; C[--D] == 0;);
	for(auto i = 0; i <= D; i++) {
		auto j = max(i, D - i);
		if(--C[j] < 0) return false;
	}
	auto b = (D + 1) / 2;
	for(auto i = 0; i <= b; i++) if(C[i] != 0) return false;
	return true;
}

static void input() {
	scanf("%d", &N);
	for(auto i = 0; i < N; i++) {
		int x;
		scanf("%d", &x);
		C[x]++;
	}
}

int main() {
	input();
	puts(solve() ? "Possible" : "Impossible");
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘void input()’:
./Main.cpp:22:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &N);
                 ^
./Main.cpp:25:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &x);
                  ^

Judge Result