Submission #1241502

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Source Code Expand

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<iostream>
#include<algorithm>
#include<stack>
using namespace std;

const int Mod=1e9+7;

typedef long long ll;
int n,ans=1,X,Y,cntall,fac[210000],ifac[210000],cmin[210000],F[210000],cnt[210000];
stack<int>S;

struct Node{
	int c,w;
}a[210000];

int pow(int x,int l){
	if(l==0)return 1;
	int t=pow(x,l/2);
	t=(ll)t*t%Mod;
	if(l&1)t=(ll)t*x%Mod;
	return t;
}

int cmp(Node x,Node y){
	return x.w<y.w;
}

int find(int x){
	return F[x]==x?x:F[x]=find(F[x]);
}

void join(int x,int y){
	F[find(x)]=find(y);
}

void work(){
	ans=(ll)ans*fac[cntall]%Mod;
	cntall=0;
	while(!S.empty()){
		int x=S.top();
		S.pop();
		if(cnt[x]==0)continue;
		ans=(ll)ans*ifac[cnt[x]]%Mod;
		cnt[x]=0;
	}
}

int main(){
	scanf("%d %d %d",&n,&X,&Y);
	fac[0]=1;for(int i=1;i<=n;i++)fac[i]=(ll)fac[i-1]*i%Mod;
	ifac[n]=pow(fac[n],Mod-2);for(int i=n-1;i>=0;i--)ifac[i]=(ll)ifac[i+1]*(i+1)%Mod;
	for(int i=1;i<=n;i++){
		scanf("%d %d",&a[i].c,&a[i].w);
	}sort(a+1,a+n+1,cmp);
	a[0].w=1<<30;
	int min1=1,min2=0;
	for(int i=2;i<=n;i++){
		if(a[i].c!=a[i-1].c){
			min2=i;break;
		}
	}for(int i=1;i<=n;i++)F[i]=i;
	for(int i=1;i<=n;i++){
		int c=a[i].c,w=a[i].w;
		if(a[cmin[c]].w>w)cmin[c]=i;
		if(a[min1].c==c){
			if(a[min1].w+w<=X)join(i,min1);
		}else{
			if(a[min1].w+w<=Y)join(i,min1);
		}if(a[min2].c==c){
			if(a[min2].w+w<=X)join(i,min2);
		}else {
			if(a[min2].w+w<=Y)join(i,min2);
		}if(a[cmin[c]].w+w<=X)join(i,cmin[c]);
	}for(int i=1;i<=n;i++){
		a[i].w=find(i);
	}sort(a+1,a+n+1,cmp);
	for(int i=1;i<=n;i++){
		if(a[i].w!=a[i-1].w)work();
		cnt[a[i].c]++;S.push(a[i].c);cntall++;
	}work();
	printf("%d\n",ans);
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:52:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d",&n,&X,&Y);
                            ^
./Main.cpp:56:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d",&a[i].c,&a[i].w);
                                 ^

Judge Result