結果
| 問題 |
No.5021 Addition Pyramid
|
| コンテスト | |
| ユーザー |
SnowBeenDiding
|
| 提出日時 | 2025-03-21 14:16:39 |
| 言語 | C++23 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 18 ms / 2,000 ms |
| コード長 | 2,726 bytes |
| コンパイル時間 | 3,406 ms |
| コンパイル使用メモリ | 277,644 KB |
| 実行使用メモリ | 7,324 KB |
| スコア | 1,610,941 |
| 最終ジャッジ日時 | 2025-03-21 14:16:47 |
| 合計ジャッジ時間 | 6,435 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge1 |
| 純コード判定しない問題か言語 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| other | AC * 50 |
ソースコード
#include <bits/stdc++.h>
using namespace std;
static const int N = 50;
static const int MOD = 100000000;
typedef long long ll;
//=== Annealing parameters ===//
struct SAParams {
double T0 = 1e4; // initial temperature
double Tend = 1e-4; // final temperature
double alpha = 0.995; // cooling rate
int maxIter = 1000000; // maximum iterations
double timeLimit = 1.9; // seconds
int deltaRange = 1000000; // max random change per move
} sa;
int a[N][N];
int c[N];
int best_c[N];
int b[N][N];
mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
uniform_int_distribution<int> uni_pos(0, N - 1);
uniform_int_distribution<int> uni_delta(-sa.deltaRange, sa.deltaRange);
double elapsed() {
static auto start = chrono::high_resolution_clock::now();
auto now = chrono::high_resolution_clock::now();
return chrono::duration<double>(now - start).count();
}
// Build pyramid from bottom c into b
void build() {
for (int j = 0; j < N; j++)
b[N - 1][j] = (c[j] % MOD + MOD) % MOD;
for (int i = N - 2; i >= 0; i--) {
for (int j = 0; j <= i; j++) {
b[i][j] = (b[i + 1][j] + b[i + 1][j + 1]) % MOD;
}
}
}
// Compute maximum modular error
int evaluate() {
int mx = 0;
for (int i = 0; i < N; i++)
for (int j = 0; j <= i; j++) {
int diff = abs(a[i][j] - b[i][j]);
mx = max(mx, min(diff, MOD - diff));
}
return mx;
}
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
for (int i = 0; i < N; i++)
for (int j = 0; j <= i; j++)
cin >> a[i][j];
// initialize bottom randomly
for (int i = 0; i < N; i++)
c[i] = uniform_int_distribution<int>(0, MOD - 1)(rng);
build();
int curScore = evaluate();
memcpy(best_c, c, sizeof(c));
int bestScore = curScore;
double T = sa.T0;
int iter = 0;
while (elapsed() < sa.timeLimit && T > sa.Tend) {
int pos = uni_pos(rng);
int old = c[pos];
int delta = uni_delta(rng);
c[pos] = (old + delta + MOD) % MOD;
build();
int newScore = evaluate();
int diff = newScore - curScore;
if (diff < 0 ||
exp(-diff / T) > uniform_real_distribution<double>(0, 1)(rng)) {
curScore = newScore;
if (newScore < bestScore) {
bestScore = newScore;
memcpy(best_c, c, sizeof(c));
}
} else {
c[pos] = old;
}
T *= sa.alpha;
iter++;
}
// output best solution
for (int i = 0; i < N; i++)
cout << best_c[i] << (i + 1 < N ? ' ' : '\n');
return 0;
}
SnowBeenDiding