【day60】 - 技术栈

有n（2≤n≤20）块芯片，有好有坏，已知好芯片比坏芯片多。

每个芯片都能用来测试其他芯片。用好芯片测试其他芯片时，能正确给出被测试芯片是好还是坏。而用坏芯片测试其他芯片时，会随机给出好或是坏的测试结果（即此结果与被测试芯片实际的好坏无关）。

给出所有芯片的测试结果，问哪些芯片是好芯片。

cpp 复制代码

#include<iostream>
#include<vector>
using namespace std;
vector<int>ans;
int n;
int a[20][20];
bool found;
bool rightchip(int row) {
	if (ans.empty())return true;
	for (int i = 0; i < n; i++) {
			if (a[ans[0]][i] != a[row][i])return false;
	}
	return true;
}
void dfs(int cur,int target) {
	if (found)return;
	if (target == 0) {
		for (int c : ans)cout << c+1 << " ";
		cout << endl;
		found = true;
		return;
	}
	//1、剩余的芯片小于还需要达成的目标数
	//2、最后一块芯片已经检查完了
	if (n - cur < target || cur == n)return;
	//不选
	if (!found)dfs(cur + 1, target);
	//选
	if (rightchip(cur)) {
		ans.push_back(cur);
		dfs(cur + 1, target - 1);
		ans.pop_back();
	}
}
int main() {
	cin >> n;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			cin >> a[i][j];
		}
	}
	for (int i = n; i > n / 2; i--) {
		ans.clear();
		found = false;
		dfs(0, i);
		if (found)break;
	}
	return 0;
}

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