Submission #30845

#	Time	Username	Problem	Language	Result	Execution time	Memory
30845		Kerim	Schools (IZhO13_school)	C++14	100 / 100	316 ms	14104 KiB

school

#include "bits/stdc++.h"
#define MAXN 300009
#define INF 1000000007
#define mp(x,y) make_pair(x,y)
#define all(v) v.begin(),v.end()
#define pb(x) push_back(x)
#define wr cout<<"----------------"<<endl;
#define ppb() pop_back()
#define tr(ii,c) for(__typeof((c).begin()) ii=(c).begin();ii!=(c).end();ii++)
#define ff first
#define ss second
#define my_little_dodge 46
#define debug(x)  cerr<< #x <<" = "<< x<<endl;
using namespace std;

typedef long long ll;
typedef pair<int,int> PII;
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
PII arr[MAXN];
ll suf[MAXN];
multiset<int>st;
bool cmp(PII x,PII y){
	return (x.ss-x.ff<y.ss-y.ff);
}
int main(){
	//~ #ifndef ONLINE_JUDGE
    //~ freopen("file.in", "r", stdin);
	//~ #endif	
	int n,a,b;
	scanf("%d%d%d",&n,&a,&b);
	for(int i=1;i<=n;i++)
		scanf("%d%d",&arr[i].ff,&arr[i].ss);
	sort(arr+1,arr+n+1,cmp);	
	ll cur=0;
	for(int i=n;i>n-b;i--)
		st.insert(arr[i].ss),cur+=arr[i].ss;
	suf[n-b+1]=cur;	
	for(int i=n-b;i>a;i--){
		if(*st.begin()<arr[i].ss){
			cur-=*st.begin();cur+=arr[i].ss;
			st.erase(st.begin());
			st.insert(arr[i].ss);
		}suf[i]=cur;
	}st.clear();cur=0;
	for(int i=1;i<=a;i++)
		st.insert(arr[i].ff),cur+=arr[i].ff;
	ll ans=cur+suf[a+1];
	for(int i=a+1;i<=n-b;i++){
		if(*st.begin()<arr[i].ff){
			cur-=*st.begin();cur+=arr[i].ff;
			st.erase(st.begin());
			st.insert(arr[i].ff);
		}
		umax(ans,cur+suf[i+1]);	
	}
	printf("%lld\n",ans);
	return 0;
}

Compilation message (stderr)

school.cpp: In function 'int main()':
school.cpp:31:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d",&n,&a,&b);
                          ^
school.cpp:33:38: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&arr[i].ff,&arr[i].ss);
                                      ^

• Subtask 1: 100 / 100