Submission #1367663

#	Time	Username	Problem	Language	Result	Execution time	Memory
1367663		hahaha	A String Problem (EGOI25_stringproblem)	C++20	0 / 100	0 ms	344 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define int long long 
#define pb push_back
const int N=1e5+1;
struct coord{
    int a;
    int b;
};
vector<coord>pin;
int n;
int sum[4];
int fr[4];
int p[4];
signed main(){  
    cin>>n; 
    int mod=2*n;
    for(int i=0; i<n; i++){
        int x,y; 
        cin>>x>>y;
        bool go=true;  
        for(int j=0; j<4&&go; j++)
            if((x+y)%mod==sum[j] || sum[j]==0){
                if(sum[j]==0) sum[j]=(x+y)%mod;
                fr[j]++;
                p[j]=i;
                go=false; 
            }
        if(y<x) swap(x,y);
        pin.pb({x,y});
    }   
    
    for(int i=0; i<4; i++){
        if(fr[i]==n) {cout<<0<<endl; return 0;}
    }
    int a=-1, b=-1;
    for(int i=0; i<4; i++){
        if(fr[i]==1){
            if(a==-1)a=p[i];
            else if(b==-1) b=p[i];
        }
    } 
    cout<<2<<endl;
    cout<<a<<" "<<pin[a].a<<" "<<pin[b].a<<endl;
    cout<<b<<" "<<pin[b].a<<" "<<pin[a].a<<endl;
}

• Subtask 0: 0 / 0
• Subtask 1: 0 / 14
• Subtask 2: 0 / 16
• Subtask 3: 0 / 12
• Subtask 4: 0 / 28
• Subtask 5: 0 / 30