J - EXTENDED LIGHTS OUT
与这道题一样,都是高斯消元求异或方程组。
一共\(30\)盏灯,每盏灯影响上下左右的灯,基本上就是矩阵改一下。
最后求解方程,自由元随你定。
#include<iostream>
#include<cstdio>
#include<cstring>
#include<cmath>
using namespace std;
int n;
int a[35],b[35];
int g[35][35];
long long ksm(long long x,int y){
long long z = 1;
while(y){
if(y & 1) z = z * x;
y >>= 1;
x = x * x;
}
return z;
}
int ans[35];
int main(){
int T; scanf("%d",&T);
for(int cas = 1; cas <= T; ++ cas){
memset(g,0,sizeof(g));
int n = 30;
for(int i = 0; i < 5; ++ i)
for(int j = 1; j <= 6; ++ j){
scanf("%d",&g[i * 6 + j][31]);
}
for(int i = 0; i < 5; ++ i)
for(int j = 1; j <= 6; ++ j){
int id, ps = i * 6 + j;
if(i > 0) id = (i - 1) * 6 + j, g[id][ps] = 1;
if(i < 5) id = (i + 1) * 6 + j, g[id][ps] = 1;
if(j > 1) id = i * 6 + j - 1, g[id][ps] = 1;
if(j < 6) id = i * 6 + j + 1, g[id][ps] = 1;
}
for(int i = 1; i <= n; ++ i) g[i][i] = 1;
int now = 1;
for(int i = 1; i <= n; ++ i){
bool flag = 0; int pos = -1;
for(int j = now; j <= n; ++ j){
if(g[j][i] == 1) { flag = 1; pos = j; break; }
}
if(!flag) continue;
for(int j = 1; j <= n + 1; ++ j) swap(g[now][j],g[pos][j]);
for(int j = now + 1; j <= n; ++ j){
if(g[j][i] == 0) continue;
for(int k = 1; k <= n + 1; ++ k)
g[j][k] ^= g[now][k];
}
++ now;
}
printf("PUZZLE #%d\n",cas);
bool flag = 1;
for(int i = now; i <= n; ++ i){
if(g[i][n + 1] != 0) { flag = 0; break; }
}
if(!flag) { puts("Oh,it's impossible~!!"); continue; }
memset(ans,0,sizeof(ans));
for(int i = now - 1; i >= 1; -- i){
int pos = -1;
for(int j = 1; j <= n; ++ j) if(g[i][j] != 0) { pos = j; break; }
ans[pos] = g[i][n + 1];
for(int j = n; j > pos; -- j) ans[pos] ^= (ans[j] & g[i][j]);
}
for(int i = 0; i < 5; ++ i){
for(int j = 1; j <= 6; ++ j)
printf("%d ",ans[i * 6 + j]);
puts("");
}
}
return 0;
}