Submission #650206

#	Time	Username	Problem	Language	Result	Execution time	Memory
650206		milisav	Snowball (JOI21_ho_t2)	C++14	0 / 100	2 ms	452 KiB

Main

#include<bits/stdc++.h>
#define maxn 200005
using namespace std;
int n,q;
long long x[maxn];
long long w[maxn];
long long a[maxn];
long long cnt[maxn];
bool sg(long long u,long long v) {
    if(u<=0 && v<=0) return true;
    if(u>=0 && v>=0) return true;
    return false;
}
int main() {
    scanf("%d %d",&n,&q);
    for(int i=0;i<n;i++) {
        scanf("%lld",&x[i]);
    }
    for(int i=0;i<q;i++) {
        scanf("%lld",&w[i]);
    }
    long long mi=0,ma=0;
    long long pos=w[0];
    a[0]=0;
    a[1]=pos;
    mi=min(mi,pos);
    ma=max(ma,pos);
    int m=2;

    for(int i=1;i<q;i++) {
        pos+=w[i];
        mi=min(mi,pos);
        ma=max(ma,pos);
        //cout<<i<<" "<<pos<<" "<<a[m-1]<<endl;
        if(sg(pos,a[m-1])) {
            if(abs(pos)>abs(a[m-1])) {
                a[m-1]=pos;
            }
        }
        else {
            //cout<<a[m-2]<<endl;
            if(abs(pos)>abs(a[m-2])) {
                //cout<<"inc"<<endl;
                a[m]=pos;
                m++;
            }
        }
    }
    //for(int i=0;i<m;i++) cout<<a[i]<<" ";
    //cout<<endl;

    cnt[0]-=mi;
    cnt[n-1]+=ma;
    for(int i=1;i<n;i++) {
        long long len=x[i]-x[i-1];
        int l=1;
        int r=m-1;
        if(abs(a[r])+abs(a[r-1])<len) {
            if(a[r]<=0) {
                cnt[i]-=a[r];
                cnt[i-1]+=a[r-1];
            }
            else {
                cnt[i-1]+=a[r];
                cnt[i]-=a[r-1];
            }
            continue;
        }
        while(l<r) {
            int md=(l+r)/2;
            if(abs(a[md])+abs(a[md-1])<len) l=md+1;
            else r=md;
        }
        //cout<<i<<" "<<x[i]<<" "<<x[i-1]<<" "<<l<<" "<<a[l]<<" "<<a[l-1]<<" "<<len<<endl;
        if(a[l-1]<=0) {
            cnt[i]-=a[l-1];
            cnt[i-1]+=(len+a[l-1]);
        }
        else {
            cnt[i-1]+=a[l-1];
            cnt[i]+=(len-a[l-1]);
        }
    }

    for(int i=0;i<n;i++) {
        printf("%lld\n",cnt[i]);
    }
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:15:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     scanf("%d %d",&n,&q);
      |     ~~~~~^~~~~~~~~~~~~~~
Main.cpp:17:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |         scanf("%lld",&x[i]);
      |         ~~~~~^~~~~~~~~~~~~~
Main.cpp:20:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         scanf("%lld",&w[i]);
      |         ~~~~~^~~~~~~~~~~~~~

• Subtask 1: 0 / 33
• Subtask 2: 0 / 67