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Codeforces Round #267 (Div. 2)_html/css_WEB-ITnose

2024-11-22 14:35:01
Codeforces Round #267 (Div. 2)_html/css_WEB-ITnose

Codeforces Round #267 (Div. 2)

A:签到题,直接for一遍

B:取异或就是不同的数,然后bitcount一下判断即可

C:dp,dp[i]表示到i的最大值,然后对取与不取当前位置进行转移即可,要先把前缀和预处理出来

D:先利用map,把字符串hash掉,然后建图,现场在做的时候是直接记忆化搜索,不过这样处理不了环的情况,果断fst了,后来换了下姿势,先求强连通进行缩点,缩点完就是一个dag了,然后记忆化搜索即可

代码:

A:

#include int main() {	int n, p, q;	int ans = 0;	scanf("%d", &n);	while (n--) {		scanf("%d%d", &p, &q);		if (q - p >= 2) ans++;	}	printf("%d\n", ans);	return 0;}

B:

#include #include int n, m, k;int bitcount(int x) {	int ans = 0;	while (x) {		ans += (x&1);		x >>= 1;	}	return ans;}const int N = 1005;int x[N];int main() {	scanf("%d%d%d", &n, &m, &k);	for (int i = 0; i   
C:

#include #include #include using namespace std;const int N = 5005;const long long INF = 0x3f3f3f3f3f3f3f;long long dp[N][N];int n, m, k;long long num[N], pre[N];int main() {	scanf("%d%d%d", &n, &m, &k);	for (int i = 1; i = m)				dp[i][j] = max(dp[i][j], dp[i - m][j - 1] + pre[i] - pre[i - m]);			dp[i][j] = max(dp[i][j], dp[i - 1][j]);		}	}	printf("%lld\n", dp[n][k]);	return 0;}

D:

#include #include #include #include #include #include #include #include using namespace std;typedef long long ll;const int N = 1000005;vector g[N], scc[N];int pre[N], lowlink[N], sccno[N], dfs_clock, scc_cnt;stack S;typedef pair pii;int n, m, hn;map hash;string str[N];pii s[N];pii p[N];pii dp[N];int vis[N];vector g2[N];void dfs_scc(int u) {	pre[u] = lowlink[u] = ++dfs_clock;	S.push(u);	for (int i = 0; i = 'A' && str[i] > str[i];		get(str[i]);	}	scanf("%d", &m);	string u, v;	while (m--) {		cin >> u >> v;		int uu = get(u);		int vv = get(v);		g[uu].push_back(vv);	}	find_scc(hn);	ll ans1 = 0, ans2 = 0;	for (int i = 0; i