Submission #1559188

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;
typedef long long int ll;
static const int MAX_N = 100000;
static const int MAX_A = 100000;

int N;
int a[MAX_N];

int num[MAX_A + 3];

void solve(){
	for(int i = 0; i < MAX_A + 3; i++) num[i] = 0;
	for(int i = 0; i < N; i++){
		num[a[i]]++;
	}
	int max = 0;
	for(int i = 0; i < MAX_A + 3; i++){
		int sum = num[i] + num[i + 1] + num[i + 2];
		if(sum > max) max = sum;
	}
	printf("%d\n", max);
}

int main(){
	scanf("%d", &N);
	for(int i = 0; i < N; i++) scanf("%d", &a[i]);
	solve();
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:26:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &N);
                 ^
./Main.cpp:27:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  for(int i = 0; i < N; i++) scanf("%d", &a[i]);
                                               ^
./Main.cpp: In function ‘void solve()’:
./Main.cpp:19:31: warning: iteration 100002u invokes undefined behavior [-Waggressive-loop-optimizations]
   int sum = num[i] + num[i + 1] + num[i + 2];
                               ^
./Main.cpp:18:19: note: containing loop
  for(int i = 0; i < MAX_A + 3; i++){
                   ^

Judge Result