无输出求调

P1440 求m区间内的最小值

QZY2008 @ 2021-09-26 23:20:46

#include <bits/stdc++.h>
const int N=2e6+1;
struct Node{
    int val;
    int l,r;
};
int n,m;
Node tree[N<<2+1];
inline void in(int &x){
    x=0;int f=1;
    char ch=getchar();
    while ((ch<'9'||ch>'0')&&ch!='-')
        ch=getchar();
    if (ch=='-')
        f=-1;
    while (ch<='9'&&ch>='0')
        x=x*10+ch-'0',ch=getchar();
    x*=f;
    return;
}
#define lson value<<1
#define rson value<<1|1
inline int min(int a,int b){
    return a>b?b:a;
}
inline void Pushup(int value){
    tree[value].val=min(tree[lson].val,tree[rson].val);
}
int num[N];
inline void Build(int value,int l,int r){
    if (l>r)return;
    if (l==r){
        tree[value].l=l;tree[value].r=r;
        tree[value].val=num[l+r>>1];
        return;
    }
    int mid=l+r>>1;
    Build(l,lson,mid);Build(rson,mid+1,r);
    tree[value].l=l;tree[value].r=r;
    Pushup(value);
}
int L,R;
const int inf=INT_MAX;
inline int Query(int value,int l,int r){
    if (l>r)return 0;
    if (L<=l&&R>=r)
        return tree[value].val;
    int mid=l+r>>1;
    int mn=inf;
    if (L<=mid)
        mn=min(mn,Query(l,mid,lson));
    if (R>mid)
        mn=min(mn,Query(mid+1,r,rson));
    return mn;
}
int main(){
    in(n);in(m);
    for (int i=1;i<=n;i++)  
        in(num[i]);
    Build(1,1,n);
    for (int i=1;i<=n;i++){
        L=i-m;R=i-1;
        if(L<=0)L=1;
        if (L>R){
            putchar('0');
            puts("");
            continue;
        }
        printf("%d\n",Query(1,n,1));
    }
} 

by QZY2008 @ 2021-09-26 23:22:34

思路:线段树维护区间最小值,马蜂有毒请谅解


by QZY2008 @ 2021-09-26 23:24:13

@y0y68

@RAYMOND_7

@0____0


by Dry_ice @ 2021-09-26 23:27:05

@QZY2008 nm 为啥要用segment_tree,单调队列优化 dp 不就行了吗……


by QZY2008 @ 2021-09-26 23:29:07

@Dry_ice 太菜了呗


by QZY2008 @ 2021-09-26 23:33:40

啊,手写快读有毒,ch<'0'||ch>'9'写成了ch>'0'||ch<'9'

此贴终结


by Dry_ice @ 2021-09-26 23:40:43

请允许我再喷一发

@QZY2008 fAKe


by gargantuar @ 2021-09-27 08:44:09

给个调试方法,给每个关键句后边都加上输出,输出卡在哪里就是哪里出问题了。你这种无输出大概率不是思路问题,调调就好。


by Echidna @ 2021-09-27 09:42:44

@Dry_ice 这不纯单调队列吗


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