Submission #1440515


Source Code Expand

#include<bits/stdc++.h>
using namespace std;
int ans;
int n,m;
int x[100005];
int num[100005],match[100005];
int main(){
	scanf("%d%d",&n,&m);
	for(int i=1,v;i<=n;i++) scanf("%d",&v),x[v%m]++,num[v]++;
	for(int i=1;i<=100000;i++) match[i%m]+=num[i]/2;
	int ans=x[0]/2*2;
	if(m%2==0) ans+=x[m/2]/2*2;
	for(int i=1;i<(m+1)/2;i++){
		int x1=x[i],x2=x1-match[i]*2,y1=x[m-i],y2=y1-match[m-i]*2;
		if(x1<y1) swap(x1,y1),swap(x2,y2);
		if(x2<=y1) ans+=x1+y1-(x1+y1)%2;
		else ans+=match[i]*2+y1*2;
	}
	cout<<ans/2<<endl;
	return 0;
}

Submission Info

Submission Time
Task D - Pair Cards
User Wuvin
Language C++14 (GCC 5.4.1)
Score 0
Code Size 546 Byte
Status WA
Exec Time 13 ms
Memory 1408 KB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:8:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
                     ^
./Main.cpp:9:58: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  for(int i=1,v;i<=n;i++) scanf("%d",&v),x[v%m]++,num[v]++;
                                                          ^

Judge Result

Set Name sample all
Score / Max Score 0 / 0 0 / 700
Status
AC × 2
AC × 28
WA × 6
Set Name Test Cases
sample sample-01.txt, sample-02.txt
all sample-01.txt, sample-02.txt, 01-01.txt, 01-02.txt, 01-03.txt, 01-04.txt, 01-05.txt, 01-06.txt, 01-07.txt, 01-08.txt, 01-09.txt, 01-10.txt, 01-11.txt, 01-12.txt, 01-13.txt, 01-14.txt, 01-15.txt, 01-16.txt, 01-17.txt, 01-18.txt, 01-19.txt, 01-20.txt, 01-21.txt, 01-22.txt, 01-23.txt, 01-24.txt, 01-25.txt, 01-26.txt, 01-27.txt, 01-28.txt, 01-29.txt, 01-30.txt, sample-01.txt, sample-02.txt
Case Name Status Exec Time Memory
01-01.txt AC 2 ms 256 KB
01-02.txt AC 11 ms 640 KB
01-03.txt AC 11 ms 640 KB
01-04.txt AC 11 ms 640 KB
01-05.txt AC 11 ms 640 KB
01-06.txt AC 11 ms 640 KB
01-07.txt AC 11 ms 640 KB
01-08.txt AC 11 ms 640 KB
01-09.txt AC 11 ms 640 KB
01-10.txt WA 12 ms 896 KB
01-11.txt WA 13 ms 1408 KB
01-12.txt AC 11 ms 256 KB
01-13.txt AC 11 ms 384 KB
01-14.txt AC 11 ms 640 KB
01-15.txt AC 11 ms 640 KB
01-16.txt AC 11 ms 640 KB
01-17.txt AC 11 ms 640 KB
01-18.txt AC 11 ms 640 KB
01-19.txt AC 11 ms 768 KB
01-20.txt AC 12 ms 1408 KB
01-21.txt AC 11 ms 640 KB
01-22.txt AC 11 ms 640 KB
01-23.txt AC 11 ms 640 KB
01-24.txt WA 11 ms 640 KB
01-25.txt WA 12 ms 896 KB
01-26.txt WA 12 ms 1408 KB
01-27.txt AC 7 ms 1024 KB
01-28.txt WA 2 ms 1408 KB
01-29.txt AC 2 ms 896 KB
01-30.txt AC 2 ms 768 KB
sample-01.txt AC 2 ms 256 KB
sample-02.txt AC 2 ms 256 KB