Submission #1225620

#	Time	Username	Problem	Language	Result	Execution time	Memory
1225620		TadijaSebez	Advertisement 2 (JOI23_ho_t2)	C++20	100 / 100	365 ms	30088 KiB

Main

#include <bits/stdc++.h>
using namespace std;

const int N=500050;
int x[N],e[N],ord[N];
bool done[N];
int main(){
    int n;
    scanf("%i",&n);
    set<pair<int,int>> all;
    for(int i=1;i<=n;i++){
        scanf("%i %i",&x[i],&e[i]);
        if(all.count({x[i],e[i]})){
            n--;
            i--;
        }else{
            all.insert({x[i],e[i]});
            ord[i]=i;
        }
    }
    sort(ord+1,ord+1+n,[&](int i,int j){return x[i]<x[j];});
    int ans=0;
    int mx=e[ord[1]]+x[ord[1]];
    for(int i=2;i<=n;i++){
        if(e[ord[i]]+x[ord[i]]<=mx){
            done[i]=true;
        }
        mx=max(mx,e[ord[i]]+x[ord[i]]);
    }
    mx=e[ord[n]]-x[ord[n]];
    for(int i=n-1;i>=1;i--){
        if(e[ord[i]]-x[ord[i]]<=mx){
            done[i]=true;
        }
        mx=max(mx,e[ord[i]]-x[ord[i]]);
    }
    for(int i=1;i<=n;i++){
        if(!done[i])ans++;
    }
    printf("%i\n",ans);
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:9:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |     scanf("%i",&n);
      |     ~~~~~^~~~~~~~~
Main.cpp:12:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |         scanf("%i %i",&x[i],&e[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 23 / 23
• Subtask 3: 36 / 36
• Subtask 4: 31 / 31