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#include "bits/stdc++.h"
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
#define rep2(i,l,r)for(int i=(l);i<(r);++i)
#define endl "\n"

long long N, M, subM;
int Board[7][7];
long long dfs(const int &d) {
if (d == ((N - 1)* (N - 1) - 1)) {
return 1;
}
int x = d / (N - 1) + 1;
int y = d % (N - 1) + 1;
long long ret = 0;
rep(i, N) {
int num = i + 1;
bool b = true;
rep(j, N) {
if (num == Board[x][j]) {
b = false;
break;
}
}
if (!b) { continue; }
rep(j, N) {
if (num == Board[j][y]) {
b = false;
break;
}
}
if (!b) { continue; }
Board[x][y] = num;
ret += dfs(d + 1);
Board[x][y] = 0;
}
return ret;
}
int main() {
cin >> N;
clock_t start = clock();
M = 1;
rep(i, N) {
M *= (i + 1);
}
subM = M / N;
rep(i, N) {
Board[0][i] = i + 1;
Board[i][0] = i + 1;
}
long long ans = M * subM;
ans *= dfs(0);
cout << ans << endl;
clock_t end = clock();
const double time = static_cast<double>(end - start);
printf("time %d[ms]\n", (int)time);
}
¡¡¡¡ 2·î17Æü¡Ê¿å¡Ë 22:55:37¡¡¡¡ ¡¡¡¡50163
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#50057¤ò²þÎɤ·¤¿¤â¤Î20ÉÃ(7*7)
#include "bits/stdc++.h"
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
#define rep2(i,l,r)for(int i=(l);i<(r);++i)
#define endl "\n"

long long N, M, subM;
int memo[5040][7];
bool Check[7][7];
long long dfs(const int &d) {
if (d == (N - 2)) {
return 1;
}
long long ret = 0;
rep2(i, (d + 1)*subM, (d + 2)*subM) {
bool b = true;
rep2(j, 1, N) {
if (Check[j][memo[i][j]]) {
b = false;
break;
}
}
if (b) {
rep(j, N) {
Check[j][memo[i][j]] = true;
}
ret += dfs(d + 1);
rep(j, N) {
Check[j][memo[i][j]] = false;
}
}
}
return ret;
}
int main() {
cin >> N;
clock_t start = clock();
M = 1;
vector<int>v;
rep(i, N) {
v.push_back(i);
M *= (i + 1);
}
subM = M / N;
int now = 0;
do {
rep(i, N) {
memo[now][i] = v[i];
}
now++;
} while (next_permutation(v.begin(), v.end()));

rep(i, N) {
Check[i][i] = true;
}
long long ans = M * subM;
ans *= dfs(0);
cout << ans << endl;
clock_t end = clock();
const double time = static_cast<double>(end - start);
printf("time %d[ms]\n", (int)time);
}
¡¡¡¡ 2·î17Æü¡Ê¿å¡Ë 22:56:26¡¡¡¡ ¡¡¡¡50164
¤¤¤Á¤´¤ß¤ë¤¯
#50163
before:if (d == ((N - 1)* (N - 1) - 1)) {
after:if (d == ((N - 1)* (N - 2))) {
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¡¡¡¡ 2·î17Æü¡Ê¿å¡Ë 23:18:25¡¡¡¡ ¡¡¡¡50165