Submission #1352393

#	Time	Username	Problem	Language	Result	Execution time	Memory
1352393		Trisanu_Das	Hack (APIO25_hack)	C++20	25 / 100	786 ms	16472 KiB

hack

#include <bits/stdc++.h>
#include "hack.h"
using namespace std;
#define ll long long
#define MAXN 1000000

int hack(){
    vector<ll> x;
    for(int i = 1; i <= MAXN; i++) x.push_back(i);
    ll final = collisions(x);
    for(int i = 1; i <= MAXN; i++){
        ll grp = MAXN / i;
        ll curr = grp * (grp - 1) / 2 * i + MAXN % i * grp;
        if(curr == final) return i;
    }
}

Compilation message (stderr)

hack.cpp: In function 'int hack()':
hack.cpp:16:1: warning: control reaches end of non-void function [-Wreturn-type]
   16 | }
      | ^

• Subtask 0: 0 / 0
• Subtask 1: 8 / 8
• Subtask 2: 17 / 17
• Subtask 3: 0 / 75