Submission #1356867

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Source Code Expand

#include <iostream>
#include <cstdio>
#include <cstring>
#include <set>
#include <utility>
typedef long long ll;

const int maxn = 100010;

std::set<ll> inc,dec;
std::set<ll>::iterator iter;
ll l[maxn], r[maxn], len[maxn];

int main()
{
	//freopen("E.in","r",stdin);
	int n;
	scanf("%d",&n);
	
	ll offset_dec = 0, offset_inc  = 0, ans = 0;
	scanf("%lld%lld",&l[1], &r[1]);
	dec.insert(r[1]); inc.insert(r[1]); len[1] = r[1] - l[1];
	
	for (int i=2;i<=n;i++)
	{
		scanf("%lld%lld",&l[i],&r[i]);
		len[i] = r[i] - l[i];
		
		//parallel move to both sides
		offset_dec -= len[i-1];
		offset_inc += len[i];
		
		// + |x-Ri|
		if (r[i] >= *inc.begin() + offset_inc)
		{
			ans += r[i] - (*inc.begin() + offset_inc);
			dec.insert(*inc.begin() + offset_inc - offset_dec);
			inc.erase(inc.begin());
			inc.insert(r[i] - offset_inc);
			inc.insert(r[i] - offset_inc);
		}
		else if (r[i] <= *(dec.rbegin()) + offset_dec)
		{
			ans += (*dec.rbegin() + offset_dec) - r[i];
			inc.insert(*dec.rbegin() + offset_dec - offset_inc);
			iter = dec.end();
			iter--;
			dec.erase(iter);
			dec.insert(r[i] - offset_dec);
			dec.insert(r[i] - offset_dec);
		}
		else
		{
			dec.insert(r[i] - offset_dec);
			inc.insert(r[i] - offset_inc);
		}
	}
	printf("%lld\n",ans);
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:18:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
                ^
./Main.cpp:21:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld%lld",&l[1], &r[1]);
                                ^
./Main.cpp:26:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld%lld",&l[i],&r[i]);
                                ^

Judge Result