53 条题解
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-2
权威
#include<iostream> #include<cstring> #include<cstdio> #include<cstring> using namespace std; struct node { int data,rev,sum; node *son[2],*pre; bool judge(); bool isroot(); void pushdown(); void update(); void setson(node *child,int lr); }lct[233]; int top,a,b; node *getnew(int x) { node *now=lct+ ++top; now->data=x; now->pre=now->son[1]=now->son[0]=lct; now->sum=0; now->rev=0; return now; } bool node::judge(){return pre->son[1]==this;} bool node::isroot() { if(pre==lct)return true; return !(pre->son[1]==this||pre->son[0]==this); } void node::pushdown() { if(this==lct||!rev)return; swap(son[0],son[1]); son[0]->rev^=1; son[1]->rev^=1; rev=0; } void node::update(){sum=son[1]->sum+son[0]->sum+data;} void node::setson(node *child,int lr) { this->pushdown(); child->pre=this; son[lr]=child; this->update(); } void rotate(node *now) { node *father=now->pre,*grandfa=father->pre; if(!father->isroot()) grandfa->pushdown(); father->pushdown();now->pushdown(); int lr=now->judge(); father->setson(now->son[lr^1],lr); if(father->isroot()) now->pre=grandfa; else grandfa->setson(now,father->judge()); now->setson(father,lr^1); father->update();now->update(); if(grandfa!=lct) grandfa->update(); } void splay(node *now) { if(now->isroot())return; for(;!now->isroot();rotate(now)) if(!now->pre->isroot()) now->judge()==now->pre->judge()?rotate(now->pre):rotate(now); } node *access(node *now) { node *last=lct; for(;now!=lct;last=now,now=now->pre) { splay(now); now->setson(last,1); } return last; } void changeroot(node *now) { access(now)->rev^=1; splay(now); } void connect(node *x,node *y) { changeroot(x); x->pre=y; access(x); } void cut(node *x,node *y) { changeroot(x); access(y); splay(x); x->pushdown(); x->son[1]=y->pre=lct; x->update(); } int query(node *x,node *y) { changeroot(x); node *now=access(y); return now->sum; } int main() { scanf("%d%d",&a,&b); node *A=getnew(a); node *B=getnew(b); //连边 Link connect(A,B); //断边 Cut cut(A,B); //再连边orz Link again connect(A,B); printf("%d\n",query(A,B)); return 0; } -
-3
#include<bits/stdc++.h> using namespace std; const int N=1010;//1表示开头为1,2表示10的2次方 const int INT=0x3f3f3f3f;//INT+INT int范围内最大INT*INT ,long long; int n,m; void dfs(int n,int m){ int sum=0,ans=0; sum=n; ans=m; cout<<ans+1-1+1-1+1-1+sum+1-1+1-1+1-1; } int main( ) { cin>>n>>m; dfs(n,m); }
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-5
http://ybt.ssoier.cn:8088/problem_show.php?pid=1509
#include <bits/stdc++.h> using namespace std; const int N = 5e4 + 10; const int INF = 0x3f3f3f3f; int n; int u , v , w , maxx; vector<pair<int,int> > vc[N]; int dis[N]; bool vis[N]; void spfa()//求最长路!!! { memset(dis, -INF, sizeof(dis)); dis[0] = 0; vis[0] = 1;//表示当前点是否在队列中 queue<int> q; q.push(0); while(!q.empty()) { int u = q.front(); q.pop(); vis[u] = 0; for(int i = 0; i < vc[u].size(); i++) { int v = vc[u][i].first , w = vc[u][i].second; if(dis[v] < dis[u] + w) { dis[v] = dis[u] +w; if(!vis[v]) { q.push(v); vis[v] = 1; } } } } } int main() { cin >> n; for(int i = 1; i <= n; i++) { cin >> u >> v >> w; u++ , v++;//整体右移 //sum[v] - sum[u - 1] >= w vc[u - 1].push_back({v , w}); maxx = max(maxx , v); } //隐藏不等式 sum[i] - sum[i - 1] >= 0 sum[i - 1] - sum[i] >= -1 for(int i = 1; i <= maxx; i++) { vc[i - 1].push_back({i , 0}); vc[i].push_back({i - 1, -1}); } spfa(); cout << dis[maxx]; return 0; }
信息
- ID
- 1
- 时间
- 1000ms
- 内存
- 128MiB
- 难度
- 1
- 标签
- 递交数
- 5207
- 已通过
- 1480
- 上传者