Submission #400119

#	Time	Username	Problem	Language	Result	Execution time	Memory
400119		teehandsome	Bridges (APIO19_bridges)	C++11	16 / 100	981 ms	3884 KiB

bridges

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define endl '\n'
#define INF 1e9+7
#define all(x) x.begin(),x.end()
using namespace std;
using namespace __gnu_pbds;
using ll=long long;
using pii=pair<int,int>;
using ppi=pair<int,pii>;
using oset=tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update>;

template<typename T>
void _print(vector<T> x) {cerr<<"{"; for(auto e:x) cerr<<e<<","; cerr<<"}";}
void _print(pii x) {cerr<<"{"<<x.first<<","<<x.second<<"}";}
template<typename T>
void _print(T x) {cerr<<x;}

void dbg() {cerr<<endl;}
template<typename Head,typename... Tail>
void dbg(Head H,Tail... T) {
    _print(H);
    if(sizeof...(T)) cerr<<",";
    else cerr<<"\"]";
    dbg(T...);
}
#define debug(...) cerr<<"["<<#__VA_ARGS__<<"]:[\"",dbg(__VA_ARGS__)

//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const int inf=INF;
const int mxn=1e5+10;
int n,m,q;
vector<int> a;
int t[4*mxn];

void build(int v,int tl,int tr) {
    if(tl>tr) return;
    if(tl==tr) t[v]=a[tl];
    else {
        int mid=(tl+tr)/2;
        build(2*v,tl,mid);
        build(2*v+1,mid+1,tr);
        t[v]=min(t[2*v],t[2*v+1]);
    }
}
void update(int v,int tl,int tr,int pos,int val) {
    assert(pos<m and pos>=0);
    if(tl>tr or tl>pos or tr<pos) return;
    if(tl==tr and tl==pos) t[v]=val;
    else {
        int mid=(tl+tr)/2;
        update(2*v,tl,mid,pos,val);
        update(2*v+1,mid+1,tr,pos,val);
        t[v]=min(t[2*v],t[2*v+1]);
    }
}

int query(int v,int tl,int tr,int l,int r) {
    assert(l<=r);
    if(tl>tr or tl>r or tr<l) return inf;
    if(tl>=l and tr<=r) return t[v];
    int mid=(tl+tr)/2;
    int res=inf;
    res=min(res,query(2*v,tl,mid,l,r));
    res=min(res,query(2*v+1,mid+1,tr,l,r));
    return res;
}

//void deebug(int v,int tl,int tr) {
//    if(v==1) cout<<"======="<<endl;
//    cout<<"["<<v<<", {"<<tl<<","<<tr<<"}]: ";
//    cout<<t[v]<<endl;
//    if(tl==tr) return;
//    int mid=(tl+tr)/2;
//    deebug(2*v,tl,mid);
//    deebug(2*v+1,mid+1,tr);
//}

int f(int l,int r) {
    if(r-2>=m or l-1>=m) return 0;
    if(l<0 or r<0) return 0;
    if(l-1>r-2) return 0;
    return query(1,0,m-1,l-1,r-2);
}

int main () {
    ios::sync_with_stdio(false); cin.tie(0);

    cin>>n>>m; a.resize(m+1);
    for(int i=0;i<m;i++) {
        int u,v; cin>>u>>v;
        cin>>a[i];
    }
    build(1,0,m-1);

    int q; cin>>q;
    while(q--) {
        int t,x,y; cin>>t>>x>>y;
        if(t==1) {
            update(1,0,m-1,x-1,y);
        }
        else {
            int ansL=x,ansR=x;
            int l=1,r=x-1;
            while(l<=r) {
                int mid=(l+r)/2;
                if(f(mid,x)>=y) {
                    ansL=mid; r=mid-1;
                }
                else l=mid+1;
            }
            l=x+1,r=n;
            while(l<=r) {
                int mid=(l+r)/2;
                if(f(x,mid)>=y) {
                    ansR=mid; l=mid+1;
                }
                else r=mid-1;
            }
            cout<<(ansR-ansL+1)<<endl;
        }
    }
}

• Subtask 1: 0 / 13
• Subtask 2: 16 / 16
• Subtask 3: 0 / 17
• Subtask 4: 0 / 14
• Subtask 5: 0 / 13
• Subtask 6: 0 / 27