Submission #1331151

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;
#define ran 111111
int e[ran];
int m;
int chk(int x){
	int res = 0;
	for(int i=x; i<ran; i+=m)
		res += e[i];
//	printf("%d\n",res);
	return res/2;
}
int chk2(int x){
	int A = 0, B = 0, C = 0, D = 0;
	for(int i=x; i<ran; i+=m){
		A += e[i]/2;
		C += e[i];
	}
	for(int i=m-x; i<ran; i+=m){
		B += e[i]/2;
		D += e[i];
	}
	int tmp1 = min(D-B*2,C);
	int tmp2 = min(C-A*2,D);
//	printf("%d %d %d %d\n",A,B,C,D);
	return max(tmp1+B+min((C-tmp1)/2,A), tmp2+A+min((D-tmp2)/2,B));
}
int main(){
	int x,y;
	for(scanf("%d%d",&x,&m); x--;){
		scanf("%d",&y);
		e[y] ++;
	}
	int res = chk(0);
	if(m % 2 == 0)res += chk(m/2);
	for(int i=1; i+i<m; i++)
		res += chk2(i);
	printf("%d\n",res);
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:30:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  for(scanf("%d%d",&x,&m); x--;){
                         ^
./Main.cpp:31:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&y);
                 ^

Judge Result