AcWing 840

题目

AcWing 840

AC代码

  1. 拉链法
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#include<bits/stdc++.h>

#define IOS std::ios::sync_with_stdio(false),cin.tie(NULL),cout.tie(NULL)

using namespace std;

const int N = 100003;

int h[N], e[N], ne[N], idx;

void insert(int x){
int k = (x % N + N) % N;
e[idx] = x, ne[idx] = h[k], h[k] = idx ++;
}

bool find(int x){
int k = (x % N + N) % N;
for (int i = h[k]; i != -1; i = ne[i]){
if (e[i] == x)
return true;
}
}

int main(){

int n;
cin >> n;

memset(h, -1, sizeof h);

while (n --){
char op[2];
int x;

scanf("%s%d", op, &x);

if (*op == 'I') insert(x);
else{
if (find(x)) puts("Yes");
else puts("No")
}
}
return 0;
}
  1. 开放寻址法
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#include<bits/stdc++.h>

#define IOS std::ios::sync_with_stdio(false),cin.tie(NULL),cout.tie(NULL)

using namespace std;

const int N = 200003, null = Ox3f3f3f;

int h[N];

int find(int x){
int k = (x % N + N) % N;

while(h[null] != null && h[k] != x){
k ++;
if (k == N) k == 0;
}

return k;
}

int main(){

int n;
cin >> n;

memset(h, -1, sizeof h);

while (n --){
char op[2];
int x;

scanf("%s%d", op, &x);

int k = find(x);
if (*op == 'I'){
h[k] = x;
}
else{
if (h[k] != null) puts("Yes");
else puts("No");
}
}
return 0;
}