제출 #1219455

#제출 시각아이디문제언어결과실행 시간메모리
1219455ppssbb09Hack (APIO25_hack)C++20
99.40 / 100
51 ms924 KiB
#include "hack.h" #include <vector> #include <bits/stdc++.h> using namespace std; using lld = long long int; int hack() { lld l = 500000002; lld r = 1000000001; lld sum = 0; while (l + 1 < r) { for (lld i = 0; i < (lld)log2(r - l + 1); i++) { lld sq = ceil(sqrt((r - l) / 2)); vector<lld> x(sq * 2); for (lld j = 0; j < sq; j++) { x[j] = j + 1; } for (lld j = 0; j < sq; j++) { x[sq + j] = l + (sq) * (j + 1) - 1; } lld col = collisions(x); if (col) { r = x[sq * 2 - 1]; } else l = x[sq * 2 - 1] + 1; sum += sq * 2; } } lld col; if (collisions({ 1, l })) col = l - 1; else col = l; for (lld i = 2; i <= sqrt(col); i++) { if (col % i == 0) { if (collisions({ 1, i + 1 })) return i; } } for (lld i = sqrt(col); i >= 2; i--) { if (col % i == 0) { if (collisions({ 1, (col / i) + 1 })) return col / i; } } return col; }
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