Submission #344372

#	Time	Username	Problem	Language	Result	Execution time	Memory
344372		nicolaalexandra	Weighting stones (IZhO11_stones)	C++14	100 / 100	324 ms	4648 KiB

stones

#include <bits/stdc++.h>
#define DIM 100010
using namespace std;

struct segment_tree{
    int mini,maxi,lazy;
} aint[DIM*4];

int n,x,nr,i;

void update_lazy (int nod, int st, int dr){
    if (!aint[nod].lazy)
        return;
    if (st != dr){
        int fiu_st = nod<<1, fiu_dr = (nod<<1)|1;
        aint[fiu_st].mini += aint[nod].lazy;
        aint[fiu_st].maxi += aint[nod].lazy;
        aint[fiu_st].lazy += aint[nod].lazy;

        aint[fiu_dr].mini += aint[nod].lazy;
        aint[fiu_dr].maxi += aint[nod].lazy;
        aint[fiu_dr].lazy += aint[nod].lazy;
    }
    aint[nod].lazy = 0;
}

void update (int nod, int st, int dr, int x, int y, int val){
    update_lazy (nod,st,dr);
    if (x <= st && dr <= y){
        aint[nod].maxi += val;
        aint[nod].mini += val;
        aint[nod].lazy += val;
        update_lazy (nod,st,dr);
        return;
    }
    int mid = (st+dr)>>1;
    if (x <= mid)
        update (nod<<1,st,mid,x,y,val);
    if (y > mid)
        update ((nod<<1)|1,mid+1,dr,x,y,val);

    update_lazy (nod<<1,st,mid);
    update_lazy ((nod<<1)|1,mid+1,dr);

    aint[nod].mini = min (aint[nod<<1].mini,aint[(nod<<1)|1].mini);
    aint[nod].maxi = max (aint[nod<<1].maxi,aint[(nod<<1)|1].maxi);
}

int main (){

    //ifstream cin ("date.in");
    //ofstream cout ("date.out");

    cin>>n;
    for (i=1;i<=n;i++){
        cin>>x>>nr;
        if (nr == 1)
            update (1,1,n,1,x,1);
        else update (1,1,n,1,x,-1);

        if (aint[1].mini >= 0)
            cout<<">\n";
        else {
            if (aint[1].maxi <= 0)
                cout<<"<\n";
            else cout<<"?\n";
        }
    }


    return 0;
}

• Subtask 1: 100 / 100