Submission #958216

#	Time	Username	Problem	Language	Result	Execution time	Memory
958216		yeediot	Weighting stones (IZhO11_stones)	C++17	100 / 100	31 ms	3912 KiB

stones

#include<bits/stdc++.h>
using namespace std;
#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;
struct node{
    int mx,mn;
};
node operator +(node a,node b){
    return {max(a.mx,b.mx),min(a.mn,b.mn)};
}
int n;
struct segtree{
    node seg[4*mxn];
    int tag[4*mxn];
    void add(int id,int v){
        seg[id].mx+=v;
        seg[id].mn+=v;
        tag[id]+=v;
    }
    void push(int id){
        if(tag[id]==0)
            return;
        add(id*2,tag[id]);
        add(id*2+1,tag[id]);
        tag[id]=0;
    }
    void build(int l,int r,int id){
        seg[id].mx=seg[id].mn=tag[id]=0;
        if(l==r){
            return;
        }
        int mm=l+r>>1;
        build(l,mm,id*2);
        build(mm+1,r,id*2+1);
    }
    void modify(int l,int r,int id,int ql,int qr,int v){
        if(qr<l or r<ql){
            return;
        }
        if(ql<=l and r<=qr){
            add(id,v);
            return;
        }
        int mm=l+r>>1;
        push(id);
        modify(l,mm,id*2,ql,qr,v);
        modify(mm+1,r,id*2+1,ql,qr,v);
        seg[id]=seg[id*2]+seg[id*2+1];
    }
    void modify(int l,int r,int v){
        modify(1,n,1,l,r,v);
    }
}tr;
signed main(){
    setio();
    ios::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    cin>>n;
    //tr.build(1,n,1);
    for(int i=1;i<=n;i++){
        int c,s;
        cin>>c>>s;
        s=(s==1?1:-1);
        tr.modify(1,c,s);
        if(tr.seg[1].mn>=0)
            cout<<">\n";
        else if(tr.seg[1].mx<=0)
            cout<<"<\n";
        else
            cout<<"?\n";
    }
}
 /*
 input:
 
 */















 

Compilation message (stderr)

stones.cpp: In member function 'void segtree::build(int, int, int)':
stones.cpp:81:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   81 |         int mm=l+r>>1;
      |                ~^~
stones.cpp: In member function 'void segtree::modify(int, int, int, int, int, int)':
stones.cpp:93:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   93 |         int mm=l+r>>1;
      |                ~^~
stones.cpp: In function 'void setIO(std::string)':
stones.cpp:41:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
stones.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 + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100