Submission #145549

#	Time	Username	Problem	Language	Result	Execution time	Memory
145549		surface03	공주님의 정원 (KOI11_flower)	C++14	18 / 18	45 ms	2080 KiB

flower

#include<bits/stdc++.h>
using namespace std;
int ans,np,flag,n;
struct data{
    int fr,re;
    bool operator<(const data&r)const{
        return fr<r.fr;
    }
}p[100010];
int main(){
    scanf("%d",&n);
    for(int i=0,n1,n2,n3,n4;i<n;i++){
        scanf("%d%d%d%d",&n1,&n2,&n3,&n4);
        p[i].fr=40*n1+n2;
        p[i].re=40*n3+n4;
    }
    sort(p,p+n);
    flag=40*3+1;
    np=-1;
    for(int i=0;i<n;i++){
        if(flag>=40*12+1)break;
        if(p[i].fr>flag){
            if(np==-1){
                printf("0");
                return 0;
            }
            flag=p[np].re;
            np=-1;
            ans++;
        }
        if(p[i].fr<=flag&&p[i].re>=40*12+1){
            flag=1<<30;
            ans++;
            break;
        }
        if(i==n-1){
            if(p[i].fr<=flag&&p[i].re>=40*12+1){
                flag=1<<30;
                ans++;
                break;
            }
        }
        if(np==-1){
            np=i;
            continue;
        }
        if(p[np].re<p[i].re){
            np=i;
        }
    }
    if(flag<40*12+1){
        printf("0");
    }
    else printf("%d",ans);
}

Compilation message (stderr)

flower.cpp: In function 'int main()':
flower.cpp:11:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~
flower.cpp:13:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d%d%d",&n1,&n2,&n3,&n4);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 2 / 2
• Subtask 2: 7 / 7
• Subtask 3: 9 / 9