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python/TangDou/LuoGuBook/P2036.cpp
HuangHai 1f397eca87 'commit'
2025-08-30 18:35:01 +08:00

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#include <bits/stdc++.h>
using namespace std;
const int INF = 0x3f3f3f3f;
typedef long long LL;
const int N = 20;
int n;
int s[N], b[N];
LL MIN = INF;
int main() {
cin >> n;
for (int i = 0; i < n; i++) cin >> s[i] >> b[i];
//穷举所有可能的酸度和苦度
//使用二进制枚举法,遍历所有可能性,然后分别计算总的酸度和苦度,找出最小的。
int U = 1 << n; //U-1即为全集 ,比如 1<<5 就是 2的5次方就是32U=32。而U-1=31就是表示 1 1 1 1 1
for (int S = 1; S < U; S++) { //枚举所有子集[0,U) //为啥从1开始因为0代表啥也不选就是白水
LL sum_s = 1, sum_b = 0;
//是哪些数存在于子集中呢?
for (int i = 0; i < n; i++) {
int bit = (S >> i) & 1;
if (bit) sum_s *= s[i], sum_b += b[i]; //遍历数字S的每一位如果不是0表示这一位上的数字是存在的需要加进来
}
MIN = min(MIN, abs(sum_s - sum_b));
}
cout << MIN << endl;
return 0;
}