线段树进阶,主席树,莫队,相似kmp,悬线,单调栈,单调队列,ac自动机,后缀数组,后缀自动机

图论:最短路,差分约束,二分图,网络流,连通分量 不学图论了我太难了
 
三分找,单调增+max+单调减/单调减+min+单调加,中的max/min,复杂度2log3(n)(比二分慢)
double three_devide(double low,double up)
{
double m1,m2;
while(up-low>=eps)
{
m1=low+(up-low)/;
m2=up-(up-low)/;
if(f(m1)<=f(m2))
low=m1;
else
up=m2;
}
return (m1+m2)/;
}

单调队列

#include <iostream>
using namespace std;
const int N = ; // 数组长度的最大值
struct data {
int id, value;
} q[N];
int a[N], n, k, l, r;
int main() {
scanf("%d%d", &n, &k);
for (int i = ; i < n; ++i) {
scanf("%d", &a[i]);
}
l = , r = -; // 队首和队尾在数组 q 中的下标
for (int i = ; i < n; ++i) {
while (l <= r && q[l].id <= i - k) l++; // 不断弹出不符合要求的队首元素
while (l <= r && q[r].value <= a[i]) r--; // 不断弹出不符合要求的队尾元素
q[++r] = {i, a[i]}; // 将当前元素入队
printf("%d %d\n", i, q[l].value); // 输出当前滑动窗口内的最大值
}
return ;
}
#include<bits/stdc++.h>
using namespace std;
const int maxn=1e6+;
int a[maxn],out,i,l=,r=-;
char ch[];
struct data
{
int id,value;
}q[maxn]; int main()
{
scanf("%s",ch);
while(scanf("%s",ch))
{
if(ch[]=='E')return ;
else if(ch[]=='O')
{
if(l>r)printf("%d\n",-);
else
{
out++;
while(l<=r&&q[l].id<out)l++;
if(l>r)printf("%d\n",-);
else printf("%d\n",q[l].value);
}
}
else if(ch[]=='I')
{
int x;
scanf("%d",&x);
a[i++]=x;
while(l<=r&&q[r].value<x)r--;
q[++r]={i-,x};
printf("%d\n",q[l].value);
}
}
return ;
}

https://oi-wiki.org/

2019ccpc厦门+?

try a try,拿个牌子叭(*╹▽╹*)

...

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