Submission #276942

#	Time	Username	Problem	Language	Result	Execution time	Memory
276942		thebes	Trampoline (info1cup20_trampoline)	C++14	100 / 100	1165 ms	57312 KiB

trampoline

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

typedef pair<int,int> pii;
#define F first
#define S second

const int MN = 2e5+5, LG = 19;
int R, C, N, T, i, j, x, y, a, b, s, t, sp[LG][MN], nxt, rev[MN];
map<int,int> mp, st[MN];
pii pnt[MN];

int main(){
    scanf("%d%d%d",&R,&C,&N);
    for(i=1;i<=N;i++){
        scanf("%d%d",&x,&y);
        pnt[i]={x,y};
        mp[x] = 0;
    }
    for(auto it=mp.begin();it!=mp.end();it++)
        it->second = ++nxt, rev[nxt] = it->first;
    for(i=1;i<=N;i++)
        st[mp[pnt[i].F]][pnt[i].S]=i;
    for(i=1;i<=N;i++){
        x = mp[pnt[i].F];
        if(rev[x]+1==rev[x+1]){
            auto it=st[x+1].lower_bound(pnt[i].S);
            if(it!=st[x+1].end()){
                sp[0][i]=it->S;
            }
        }
    }
    for(j=1;j<LG;j++){
        for(i=1;i<=N;i++){
            if(sp[j-1][i]&&sp[j-1][sp[j-1][i]])
                sp[j][i]=sp[j-1][sp[j-1][i]];
        }
    }
    scanf("%d",&T);
    while(T--){
        scanf("%d%d%d%d",&x,&y,&a,&b);
        if(x==a) printf("%s\n",y<=b?"Yes":"No");
        else{
            s = t = 0;
            auto it=st[mp[x]].lower_bound(y);
            if(it!=st[mp[x]].end()) s = it->S;
            it=st[mp[a-1]].upper_bound(b);
            if(it!=st[mp[a-1]].begin()&&st[mp[a-1]].size()){
                it--;
                t = it->S;
            }
            if(!s||!t) printf("No\n");
            else{
                int dis = a-x-1;
                for(j=LG-1;j>=0;j--){
                    if(dis&(1<<j)) s = sp[j][s];
                }
                if(!s) printf("No\n");
                else if(pnt[s].F==pnt[t].F&&pnt[s].S<=pnt[t].S) printf("Yes\n");
                else printf("No\n");
            }
        }
    }
    return 0;
}

Compilation message (stderr)

trampoline.cpp: In function 'int main()':
trampoline.cpp:14:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   14 |     scanf("%d%d%d",&R,&C,&N);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~
trampoline.cpp:16:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   16 |         scanf("%d%d",&x,&y);
      |         ~~~~~^~~~~~~~~~~~~~
trampoline.cpp:39:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   39 |     scanf("%d",&T);
      |     ~~~~~^~~~~~~~~
trampoline.cpp:41:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   41 |         scanf("%d%d%d%d",&x,&y,&a,&b);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 23 / 23
• Subtask 2: 20 / 20
• Subtask 3: 11 / 11
• Subtask 4: 19 / 19
• Subtask 5: 27 / 27