Submission #42212817

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Source Code Expand

#include<cstdio>
#include<cstring>
#include<set>
#define N 210000
#define fep(i,x,y) for(int i=x;i<=y;i++)
using namespace std;
typedef pair<int,int> PII;
inline int mymin(int x,int y){return x<y?x:y;}
inline int mymax(int x,int y){return x>y?x:y;}
set<PII> fuck;
int n;
int main(){
	scanf("%d",&n);
	fep(i,1,n){
		int l,r;scanf("%d%d",&l,&r);
		set<PII>::iterator x=fuck.lower_bound(make_pair(l,0));
		if(x!=fuck.begin())l=mymax(prev(x)->second+1,l);
		if(l>r)continue;
		int cnt=r-l+1;
		while(x!=fuck.end() && cnt){
			if(x->second-x->first+1<=cnt){
				cnt-=x->second-x->first+1;
				fuck.erase(x++);
			}
			else{
				fuck.insert(make_pair(x->first+cnt,x->second));
				cnt=0;
				fuck.erase(x++);
			}
		}
		fuck.insert(make_pair(l,r));
	}
	int ans=0;
	for(PII x:fuck)ans+=x.second-x.first+1;
	printf("%d\n",ans);
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:13:7: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   13 |  scanf("%d",&n);
      |  ~~~~~^~~~~~~~~
./Main.cpp:15:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   15 |   int l,r;scanf("%d%d",&l,&r);
      |           ~~~~~^~~~~~~~~~~~~~

Judge Result