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python/C++课程/待整理知识/啊哈算法/p54_dfs.cpp
HuangHai 1f397eca87 'commit'
2025-08-30 18:35:01 +08:00

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#include<stdio.h>
int a[10];//开一个数组,用来装每一位的数字,3位一个数,共9位,把索引值为0的不要,计10个
int book[10] = { 0 }; //标记哪个数是否用过了,初始值全是0,表示都没用过
int total = 0; //一共多少个解
void dfs(int step) {
int i;
//到第10步,就不用再计算了,可以出结果了
if (step == 9 + 1) {
//发现有符合条件的就记录下来
if (a[1] * 100 + a[2] * 10 + a[3] + a[4] * 100 + a[5] * 10 + a[6] == a[7] * 100 + a[8] * 10 + a[9]) {
total++;
printf("%d%d%d+%d%d%d=%d%d%d\n", a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8], a[9]);
}
return;
}
//满满的都是套路
for (i = 1; i <= 9; i++) {
if (book[i] == 0) {
a[step] = i;
book[i] = 1;
//递归进行深度优先搜索
dfs(step + 1);
book[i] = 0;
}
}
return;
}
int main() {
dfs(1);
printf("total = %d\n", total / 2);
return 0;
}