Submission #571103

#	Time	Username	Problem	Language	Result	Execution time	Memory
571103		kshitij_sodani	MP3 Player (CEOI10_mp3player)	C++14	60 / 100	78 ms	6340 KiB

mp3player

#include <bits/stdc++.h>
using namespace std;
typedef long long llo;
#define a first
#define b second
#define pb push_back
#define endl '\n'

int n,m,aa;
int it[100001];
int tt[100001];
int tree[4*110001];
int tree2[4*110001];

int lazy[4*110001];
void push(int no,int l,int r){
	tree[no]+=lazy[no];
	tree2[no]+=lazy[no];
	if(l<r){
		lazy[no*2+1]+=lazy[no];
		lazy[no*2+2]+=lazy[no];
	}
	lazy[no]=0;
}
void update(int no,int l,int r,int aa,int bb,int x){
	push(no,l,r);
	if(r<aa or l>bb or aa>bb){
		return ;
	}
	if(aa<=l and r<=bb){
		lazy[no]+=x;
		push(no,l,r);
	}
	else{
		int mid=(l+r)/2;
		update(no*2+1,l,mid,aa,bb,x);
		update(no*2+2,mid+1,r,aa,bb,x);
		tree[no]=min(tree[no*2+1],tree[no*2+2]);		
		tree2[no]=max(tree2[no*2+1],tree2[no*2+2]);		
	}
}

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cin>>n>>m>>aa;

	for(int i=0;i<n;i++){
		char s;
		cin>>s;
		if(s=='+'){
			it[i]=1;
		}
		else{
			it[i]=-1;
		}
		cin>>tt[i+1];
	}
	vector<pair<int,int>> ss;
	for(int i=1;i<n;i++){
		//ss.pb(tt[i+1]);
		ss.pb({tt[i+1]-tt[i]-1,i});
		//i wil be active after this
		//ss[ss.size()-1]-=tt[i];
		//ss[ss.size()-1]-=1;
	}
	sort(ss.begin(),ss.end());
	ss.pb({ss.back().a+1,-1});


	int su=0;
	pair<int,int> ans;

	for(int i=0;i<ss.size();i++){
		pair<int,int> cur={aa,aa};
		int ok=0;
		if(i>0){
			if(ss[i-1].a<ss[i].a){
				ok=1;
				int ind=i-1;
				while(ind>=0){
					if(ss[ind].a==ss[i-1].a){
						su+=it[ss[ind].b];
						update(0,0,n,ss[ind].b,n,it[ss[ind].b]);
						ind--;
					}
					else{
						break;
					}
				}
			}
		}
		else{
			ok=1;
		}
		if(ok==1){
			int x=tree[0];
			int l=su-tree[0];
			int r=m+(su-tree2[0]);
			if(r>=aa and aa>=l){
				if(i+1==ss.size()){
					cout<<"infinity"<<endl;
					return 0;
				}
				ans={ss[i].a,r};
			}
		}
		

	}
	//cout<<ans.a<<" "<<ans.b<<endl;
		pair<int,int> cur={aa,aa};
		for(int j=n-1;j>=1;j--){
 
			if(tt[j+1]-tt[j]>ans.a){
				continue;
			}
			if(it[j]==-1){
				cur.b+=1;
				cur.b=min(cur.b,m);
				cur.a+=1;
				if(cur.a==1){
					cur.a=0;
				}
			}
			else{
				cur.a=max(0,cur.a-1);
				cur.b-=1;
				if(cur.b==m-1){
					cur.b=m;
				}
			}
		}
	
		cout<<ans.a<<" "<<cur.b<<endl;
		
 
 
	




	return 0;
}

Compilation message (stderr)

mp3player.cpp: In function 'int main()':
mp3player.cpp:74:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   74 |  for(int i=0;i<ss.size();i++){
      |              ~^~~~~~~~~~
mp3player.cpp:101:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  101 |     if(i+1==ss.size()){
      |        ~~~^~~~~~~~~~~
mp3player.cpp:97:8: warning: unused variable 'x' [-Wunused-variable]
   97 |    int x=tree[0];
      |        ^
mp3player.cpp:75:17: warning: variable 'cur' set but not used [-Wunused-but-set-variable]
   75 |   pair<int,int> cur={aa,aa};
      |                 ^~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10