Submission #1196749

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Source Code Expand

#include<bits/stdc++.h>
#define X first
#define Y second
using namespace std;
typedef long long ll;
const ll mod = 1e9+7;
ll n, cc, x, y, a[100005], b[100005], fac[100005], ans = 1;
vector<pair<ll, ll> > grp[200005];
priority_queue<pair<ll, ll> > pq;

ll calc (ll X, ll Y) {
	if(!Y) return 1;
	ll ret = calc(X, Y/2);
	ret = (ret * ret) % mod;
	if(Y&1) ret = (ret * X) % mod;
	return ret;
}

int main()
{
	scanf("%lld%lld%lld",&n,&x,&y);
	for(int i=1;i<=n;i++) {
		scanf("%lld%lld",&a[i],&b[i]);
		grp[a[i]].push_back({b[i], a[i]});
		cc = max(cc, a[i]);
	}
	for(int i=1;i<=cc;i++) {
		if(grp[i].empty()) continue;
		sort(grp[i].begin(), grp[i].end());
		while(grp[i].size() > 1) {
			if(grp[i].back().X + grp[i][0].X > x) {
				grp[++cc].push_back(grp[i].back());
				grp[i].pop_back();
			}
			else break;
		}
		pq.push({-grp[i][0].X, i});
	}
	ll idx = pq.top().Y; pq.pop();
	while(!pq.empty()) {
		ll cur = pq.top().Y; pq.pop();
		if(grp[cur][0].X + grp[idx][0].X > y) break;
		while(grp[cur].size()) {
			grp[idx].push_back(grp[cur].back());
			grp[cur].pop_back();
		}
	}
	fac[0] = 1;
	for(int i=1;i<=n;i++) fac[i] = fac[i-1] * i % mod;
	for(int i=1;i<=cc;i++) {
		if(grp[i].empty()) continue;
		for(int j=0;j<grp[i].size();j++) swap(grp[i][j].X, grp[i][j].Y);
		sort(grp[i].begin(), grp[i].end());
		ans = (ans * fac[grp[i].size()]) % mod;
		ll cur = 1;
		for(int j=1;j<grp[i].size();j++) {
			if(grp[i][j].X != grp[i][j-1].X) {
				ans = (ans * calc(fac[cur], mod-2)) % mod;
				cur = 1;
			}
			else cur++;
		}
		ans = (ans * calc(fac[cur], mod-2)) % mod;
	}
	printf("%lld\n",ans);
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:21:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld%lld%lld",&n,&x,&y);
                                ^
./Main.cpp:23:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld%lld",&a[i],&b[i]);
                                ^

Judge Result