제출 #927587

#제출 시각아이디문제언어결과실행 시간메모리
927587yeediotRailway Trip 2 (JOI22_ho_t4)C++14
100 / 100
1384 ms174884 KiB
#include<bits/stdc++.h> using namespace std; #define int long long #define F first #define S second #define all(x) x.begin(),x.end() #define pii pair<int,int> #define pb push_back #define sz(x) (int)(x.size()) #define chmin(x,y) x=min(x,y) #define chmax(x,y) x=max(x,y) #define vi vector<int> #define vp vector<pii> #define vvi vector<vi> #define ykh mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count()) #define __lg(x) 63-__builtin_clzll(x) #define pow2(x) (1LL<<x) void __print(int x) {cerr << x;} void __print(float x) {cerr << x;} void __print(double x) {cerr << x;} void __print(long double x) {cerr << x;} void __print(char x) {cerr << '\'' << x << '\'';} void __print(const char *x) {cerr << '\"' << x << '\"';} void __print(const string &x) {cerr << '\"' << x << '\"';} void __print(bool x) {cerr << (x ? "true" : "false");} template<typename T, typename V> void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';} template<typename T> void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";} void _print() {cerr << "]\n";} template <typename T, typename... V> void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);} #ifdef local void setio(){freopen("/Users/iantsai/Library/Mobile Documents/com~apple~CloudDocs/cpp/Empty.md","r",stdin);} #define debug(x...) cerr << "[" << #x << "] = ["; _print(x) #else void setio(){} #define debug(x...) #endif void setIO(string s) { freopen((s + ".in").c_str(), "r", stdin); freopen((s + ".out").c_str(), "w", stdout); } struct line{ int a,b; int operator()(const int x)const{ return a*x+b; } }; bool check(line l1,line l2,line l3){ return (l3.b-l2.b)*(l1.a-l2.a)<=(l2.b-l1.b)*(l2.a-l3.a); } const int mxn=1e5+5; vector<int>in[mxn],out[mxn]; int l[20][mxn],r[20][mxn]; pii seg[20][4*mxn]; void pull(pii&p,pii a,pii b){ p={min(a.F,b.F),max(a.S,b.S)}; } void build(int ll,int rr,int id,int k){ if(ll==rr){ seg[k][id]={l[k][ll],r[k][ll]}; return; } int mm=ll+rr>>1; build(ll,mm,id*2,k); build(mm+1,rr,id*2+1,k); pull(seg[k][id],seg[k][id*2],seg[k][id*2+1]); } int query(int l,int r,int id,int ql,int qr,bool tf,int k){ if(qr<l or r<ql){ if(tf){ return 8e18; } else{ return -8e18; } } if(ql<=l and r<=qr){ if(tf)return seg[k][id].F; else return seg[k][id].S; } int mm=l+r>>1; if(tf){ return min(query(l,mm,id*2,ql,qr,tf,k),query(mm+1,r,id*2+1,ql,qr,tf,k)); } else{ return max(query(l,mm,id*2,ql,qr,tf,k),query(mm+1,r,id*2+1,ql,qr,tf,k)); } } signed main(){ setio(); ios::sync_with_stdio(0); cin.tie(0);cout.tie(0); int n,k,m; cin>>n>>k>>m; for(int i=0;i<m;i++){ int l,r; cin>>l>>r; if(l<r){ in[l].pb(r); out[min(r-1,l+k-1)].pb(r); } else{ in[max(r+1,l-k+1)].pb(r); out[l].pb(r); } } multiset<int>st; for(int i=1;i<=n;i++){ for(auto x:in[i]){ st.insert(x); } l[0][i]=r[0][i]=i; if(!sz(st))continue; l[0][i]=min(i,*st.begin()); r[0][i]=max(*prev(st.end()),i); debug(st,i,l[0][i],r[0][i]); for(auto x:out[i]){ st.erase(st.find(x)); } } build(1,n,1,0); for(int i=1;i<20;i++){ for(int j=1;j<=n;j++){ l[i][j]=query(1,n,1,l[i-1][j],r[i-1][j],1,i-1); r[i][j]=query(1,n,1,l[i-1][j],r[i-1][j],0,i-1); debug(l[i][j],r[i][j]); } build(1,n,1,i); } int q; cin>>q; while(q--){ int ql,qr; cin>>ql>>qr; if(ql==qr){ cout<<0<<'\n'; continue; } int ans=0; int curl=ql; int curr=ql; for(int i=19;i>=0;i--){ int L=query(1,n,1,curl,curr,1,i); int R=query(1,n,1,curl,curr,0,i); if(L<=qr and qr<=R)continue; curl=L; curr=R; ans+=(1<<i); } int L=query(1,n,1,curl,curr,1,0); int R=query(1,n,1,curl,curr,0,0); if(L<=qr and qr<=R){ ans++; } else ans=-1; cout<<ans<<'\n'; } } /* input: */

컴파일 시 표준 에러 (stderr) 메시지

Main.cpp: In function 'void build(long long int, long long int, long long int, long long int)':
Main.cpp:66:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   66 |     int mm=ll+rr>>1;
      |            ~~^~~
Main.cpp: In function 'long long int query(long long int, long long int, long long int, long long int, long long int, bool, long long int)':
Main.cpp:84:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   84 |     int mm=l+r>>1;
      |            ~^~
Main.cpp: In function 'void setIO(std::string)':
Main.cpp:42:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:43:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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