1 /* 2 题意:套娃娃,可以套一个单独的娃娃,或者把最后面的娃娃取出,最后使得0-1-2-...-(n-1),问最少要几步 3 贪心/思维题:娃娃的状态:取出+套上(2),套上(1), 已套上(0),先从1开始找到已经套好的娃娃层数, 4 其他是2次操作,还要减去k-1个娃娃是只要套上就可以 5 详细解释:http://blog.csdn.net/firstlucker/article/details/46671251 6 */ 7 #include8 #include 9 #include 10 #include 11 using namespace std;12 13 const int MAXN = 1e5 + 10;14 const int INF = 0x3f3f3f3f;15 int a[MAXN];16 17 int main(void) //Codeforces Round #310 (Div. 2) C. Case of Matryoshkas18 {19 // freopen ("C.in", "r", stdin);20 21 int n, k;22 while (scanf ("%d%d", &n, &k) == 2)23 {24 int cnt = 0;25 for (int i=1; i<=k; ++i)26 {27 int m; scanf ("%d", &m); int p = 0;28 for (int j=1; j<=m; ++j)29 {30 scanf ("%d", &a[j]); if (a[j] == 1) p = j;31 }32 if (p)33 {34 for (int j=p+1; j<=m; ++j)35 {36 if (a[j] == a[j-1] + 1) cnt++;37 else break;38 }39 }40 }41 printf ("%d\n", (n - 1 - cnt) * 2 - (k - 1));42 }43 44 return 0;45 }