Submission #403345

#	Time	Username	Problem	Language	Result	Execution time	Memory
403345		Hazem	Strange Device (APIO19_strange_device)	C++14	10 / 100	1680 ms	524292 KiB

strange_device

#include <bits/stdc++.h>
using namespace std;
 
#define LL long long
#define F first
#define S second
#define pii pair<int,int>
#define piii pair<pair<int,int>,int>

const int N = 1e6+10;
const int M = 200;
const LL INF = 1e9;
const LL LINF = 1e18;
const LL MOD = 1e9+7;
const double PI = 3.141592653589793;

pair<LL,LL>p[N];

struct node{

    node *l,*r;
    LL sum = 0,lazy = 0;
    node():l(NULL),r(NULL){};
};

void push(node * &v,LL tl,LL tr){

    if(!v->lazy)return ;
    v->sum = tr-tl+1;

    if(tl!=tr){
        
        if(v->l==NULL)v->l = new node();
        if(v->r==NULL)v->r = new node();

        v->l->lazy = 1;
        v->r->lazy = 1;    
    }
    v->lazy = 0;
}

void update(node * &v,LL tl,LL tr,LL l,LL r){

    if(v==NULL)
        v = new node();

    push(v,tl,tr);

    if(tl>r||tr<l)
        return ;
    
    if(tl>=l&&tr<=r){
        v->lazy = 1;
        push(v,tl,tr);
        return ;
    }

    LL mid = (tl+tr)/2;
    update(v->l,tl,mid,l,r);
    update(v->r,mid+1,tr,l,r);
    v->sum = v->l->sum+v->r->sum;
}

node *root;

int main(){

    //freopen("out.txt","w",stdout);

    LL n,a,b,Len;
    scanf("%lld%lld%lld",&n,&a,&b);

    if(log(a)+log(b)>log(LLONG_MAX))    
        Len = LINF;
    else 
        Len = a*b;

    bool q = 0;
    for(int i=1;i<=n;i++){
        scanf("%lld%lld",&p[i].F,&p[i].S);
        q |= p[i].S-p[i].F+1>=Len;

        p[i].F %= Len;p[i].S %= Len;
        
        if(p[i].S>=p[i].F)
            update(root,0,LINF,p[i].F,p[i].S);        
        else 
            update(root,0,LINF,p[i].F,Len-1),update(root,0,LINF,0,p[i].S);
    }

    printf("%lld\n",q?Len:root->sum);
}   

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:71:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |     scanf("%lld%lld%lld",&n,&a,&b);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
strange_device.cpp:80:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |         scanf("%lld%lld",&p[i].F,&p[i].S);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 0 / 5
• Subtask 5: 0 / 5
• Subtask 6: 0 / 20
• Subtask 7: 0 / 20
• Subtask 8: 0 / 30