题目链接
None
100 + 100 + 10 = 210
T1
不太会做...
好像....是个SB题....嗯.....div3T1难度
#include<cstdio>
#include<algorithm>
#define int long long
#define gc getchar()
#define pc putchar
inline int read() {
int x = 0,f = 1;
char c = getchar();
while(c < '0' || c > '9') c = getchar();
while(c <= '9' && c >= '0') x = x * 10 + c - '0',c = getchar();
return x * f;
}
void print(int x) {
if(x < 0) {
pc('-');
x = -x;
}
if(x >= 10) print(x / 10);
pc(x % 10 + '0');
}
main() {
freopen("grid.in","r",stdin);
freopen("grid.out","w",stdout);
int n = read(),a = read(),b = read(),c = read(),d = read();
printf("%lld\n",std::max(std::abs(a - c),std::abs(d - b)));
return 0;
}
T2
dp[i][2/3]表示以i为开始向后扩展两位是否可行..那么就是从dp[i + 2 / 3][2 / 3]转移就好了
#include<cstdio>
#include<string>
#include<cstring>
#include<algorithm>
#include<bits/stdc++.h>
using namespace std;
#define gc getchar()
#define pc putchar
inline int read() {
int x = 0,f = 1;
char c = getchar();
while(c < '0' || c > '9') c = getchar();
while(c <= '9' && c >= '0') x = x * 10 + c - '0',c = getchar();
return x * f;
}
#define ull unsigned long long
void print(int x) {
if(x < 0) {
pc('-');
x = -x;
}
if(x >= 10) print(x / 10);
pc(x % 10 + '0');
}
const int maxn = 200007;
bool dp[maxn][5];
char s[maxn];
bool judge(int l,int r,int l1,int r1) {
for(int i = l,j = l1; i <= r; ++ i,++ j) {
if(s[i] != s[j]) return true;
}
return false;
}
struct node {
int l,r;
} ans[maxn];
/*const int bas;
struct node {
ull has;
int id;
bool operator < (const Hash &k)const {
return has < k.has;
}
}
char Ts[]
ull hash(char S[]) {
} */
std::string A[maxn],B[maxn];
int tot = 0;
bool judge2(int x,int y) {
int a = A[x].size(),b = A[y].size();
if(a != b) return true;
if(a == 2) {
if(A[x][0] != A[y][0]) return true;
if(A[x][1] != A[y][1]) return true;
} else {
if(A[x][0] != A[y][0]) return true;
if(A[x][1] != A[y][1]) return true;
if(A[x][2] != A[y][2]) return true;
}
return false;
}
void solve() {
memset(dp,0,sizeof dp);
tot = 0;
int n = strlen(s + 1);
dp[n - 1][2] = 1;
dp[n - 2][3] = 1;
for(int i = n;i > 3;-- i) {
if((dp[i + 2][2] && judge(i,i + 1,i + 2,i + 3)) || dp[i + 2][3])
dp[i][2] = 1;
if((dp[i + 3][3] && judge(i,i + 2,i + 3,i + 5)) || dp[i + 3][2])
dp[i][3] = 1;
}
A[0] = "*(&*(";
for(int i = 4;i <= n;++ i) {
if(dp[i][2]) {
++ tot;
A[tot].clear();
A[tot] += s[i] , A[tot] += s[i + 1];
}
if(dp[i][3]) {
++ tot;
A[tot].clear();
A[tot] += s[i],A[tot] += s[i + 1],A[tot] += s[i + 2];
}
}
std::sort(A + 1,A + tot + 1);
int ans = 0;
for(int i = 1;i <= tot;++ i) {
if(judge2(i,i - 1))
B[++ ans] = A[i];
}
print(ans);
pc('\n');
for(int i = 1;i <= ans;++ i) {
for(int j = 0;j < B[i].size();++ j) {
pc(B[i][j]);
}
pc('\n');
}
}
void solve2() {
memset(dp,0,sizeof dp);
tot = 0;
int n = strlen(s + 1);
dp[n - 1][2] = 1;
dp[n - 2][3] = 1;
for(int i = n;i > 3;-- i) {
if((dp[i + 2][2] ) || dp[i + 2][3])
dp[i][2] = 1;
if((dp[i + 3][3] ) || dp[i + 3][2])
dp[i][3] = 1;
}
A[0] = "*(&*(";
for(int i = 4;i <= n;++ i) {
if(dp[i][2]) {
++ tot;
A[tot].clear();
A[tot] += s[i] , A[tot] += s[i + 1];
}
if(dp[i][3]) {
++ tot;
A[tot].clear();
A[tot] += s[i],A[tot] += s[i + 1],A[tot] += s[i + 2];
}
}
std::sort(A + 1,A + tot + 1);
int ans = 0;
for(int i = 1;i <= tot;++ i) {
if(judge2(i,i - 1))
B[++ ans] = A[i];
}
print(ans);
pc('\n');
for(int i = 1;i <= ans;++ i) {
for(int j = 0;j < B[i].size();++ j) {
pc(B[i][j]);
}
pc('\n');
}
}
int main() {
freopen("ling.in","r",stdin);
freopen("ling.out","w",stdout);
int n = read(),type = read();
for(int i = 1;i <= n;++ i) {
scanf("%s",s + 1);
if(type == 0) solve();
else solve2();
}
return 0;
}
T3
dp[i][j]表示以i为根的子树中,树高小于等于j的概率
转移就是dp[i][j] = 0.5 + 0.5 (dp[i][j-1]) 首先是边不连的概率，其次是<=dp[son][j -1]的
然后我zz了
对于新增一个点，对于父亲的深度影响只有该节点的深度+1，除掉旧的乘上新的就OK，我全更新了一遍...，写出了奇怪的bug...
#include<cstdio>
#include<string>
#include<cstring>
#include<algorithm>
#include<bits/stdc++.h>
using namespace std;
#define gc getchar()
#define pc putchar
inline int read() {
int x = 0,f = 1;
char c = getchar();
while(c < '0' || c > '9') c = getchar();
while(c <= '9' && c >= '0') x = x * 10 + c - '0',c = getchar();
return x * f;
}
void print(int x) {
if(x < 0) {
pc('-');
x = -x;
}
if(x >= 10) print(x / 10);
pc(x % 10 + '0');
}
const int maxn = 100005;
const int h = 60;
double dp[maxn][70];
double pp[maxn][70];
int fa[maxn];
int siz[maxn];
int node = 0;
struct node {
int v,next;
} edge[maxn << 1];
int num = 0,head[maxn];
inline void add_edge(int u,int v) {
edge[++ num].v = v; edge[num].next = head[u];head[u] = num;
}
#define eps 1e-7
void update(int x) {
int k = 60;
dp[x][0] = 1.0;
int X = x;
while(-- k && X) {
siz[X] ++;
for(int i = 0;i < h;++ i) {
if((fabs(dp[X][i] - 0.0) > eps) && ((fabs(dp[fa[X]][i + 1] - 0.0) > eps))) dp[fa[X]][i + 1] /= (0.5 + 0.5 * dp[X][i]);
}
X = fa[X];
}
k = 60;
while(-- k && x) {
dp[fa[x]][0] *= 0.5;
for(int i = 0;i < h;++ i) {
if(fabs(dp[fa[x]][i + 1] - 0.0) <= eps) dp[fa[x]][i + 1] = 1.0;
dp[fa[x]][i + 1] *= (0.5 + 0.5 * dp[x][i]);
}
x = fa[x];
}
}
int main() {
freopen("threebody.in","r",stdin); freopen("threebody.out","w",stdout);
int T = read(),q = read();
++ node;
siz[node] = 1,dp[node][0] = 1.0;
for(int ty,x,i = 1;i <= q;++ i) {
ty = read(),x = read();
if(ty == 1) {
fa[++ node] = x;
update(node);
} else {
double ans = 0;
for(int i = 1;i < std::min(siz[x],h);++ i) {
ans += 1.0 * i * std::max(dp[x][i] - dp[x][i - 1],0.0);
} printf("%lf\n",ans);
}
}
return 0;
}