Submission #1771703

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Source Code Expand

#include<bits/stdc++.h>
#define N 100005
#define x first
#define y second
#define mp(x,y) make_pair(x,y)
using namespace std;
deque<pair<int,long long> > dq;
int k,x,m,rx[N];

int main(){
    scanf("%d%d",&x,&k);
    for(int i=1;i<=k;i++) scanf("%d",&rx[i]);
    scanf("%d",&m);
    dq.push_back(mp(0,0LL));dq.push_back(mp(x,x*1LL));
    long long add = 0;int pos=0;
    while(m--){
        int t,a;scanf("%d%d",&t,&a);
        while(pos<k&&t>rx[pos+1]){
            pos++;
            add += (pos%2==1) ? rx[pos-1]-rx[pos]:rx[pos]-rx[pos-1];
            
            while(!dq.empty()&&dq.front().y+add <= 0) dq.pop_front();
            if(dq.empty()) dq.push_back(mp(0,-add)),dq.push_back(mp(x,-add));
            else if(!dq.empty()&&dq.front().x > dq.front().y+add)
                dq.push_front(mp(dq.front().x - (dq.front().y+add),-add)); 
            if(dq.front().x!=0) dq.push_front(mp(0,-add));

            while(!dq.empty()&&dq.back().y+add >= x) dq.pop_back();
            if(dq.empty()) dq.push_back(mp(0,x-add)),dq.push_back(mp(x,x-add));
            else if(!dq.empty()&&dq.back().x + x - (dq.back().y+add) <x)
                dq.push_back(mp(dq.back().x + x - (dq.back().y+add),x-add));
            if(dq.back().x!=x) dq.push_back(mp(x,x-add));
        }
        
        long long now=0;
        int l=0,r=dq.size();
        while(l+1<r){
            int mid=(l+r)>>1;
            if(dq[mid].x <= a) l=mid;
            else r = mid;
        }
        
        if(dq[l].x==a) now=dq[l].y+add;
        else now=dq[l].y+ add + (dq[l+1].y-dq[l].y)/(dq[l+1].x-dq[l].x)*(a-dq[l].x);
        if(pos%2==1) now+=t-rx[pos];
        else now-=t-rx[pos];
        
        printf("%lld\n",min(max(0LL,now),x*1LL));
    }
    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:11:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&x,&k);
                        ^
./Main.cpp:12:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     for(int i=1;i<=k;i++) scanf("%d",&rx[i]);
                                             ^
./Main.cpp:13:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&m);
                   ^
./Main.cpp:17:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         int t,a;scanf("%d%d",&t,&a);
                                    ^

Judge Result