Submission #26219

#	Time	Username	Problem	Language	Result	Execution time	Memory
26219		imsifile	Abduction 2 (JOI17_abduction2)	C++98	44 / 100	189 ms	16360 KiB

abduction2

#include<stdio.h>
#include<memory.h>
#include<algorithm>
#include<map>
using namespace std;

typedef long long lld;

struct seg {
	int j2, itr[150000];
	seg(){ j2 = 1<<16; memset(itr, 0x7f, sizeof(itr)); }
	const int& operator[] (const int ix){ return itr[j2+ix]; }
	void add(int ix, int val){
		ix+=j2; itr[ix]=val;
		for(ix>>=1; ix; ix>>=1) itr[ix]=max(itr[ix*2],itr[ix*2+1]);
	}
	int getup(int ix, int val){
		ix+=j2;
		while(1){
			if(itr[ix]>val){
				if(ix>=j2) break;
				if(itr[ix*2]>val) ix*=2;
				else ix*=2, ix++;
			}
			else{
				if(ix%2) ix++;
				else ix>>=1;
			}
		}
		return ix-j2;
	}
	int getdown(int ix, int val){
		ix+=j2;
		while(1){
			if(itr[ix]>val){
				if(ix>=j2) break;
				if(itr[ix*2+1]>val) ix*=2, ix++;
				else ix*=2;
			}
			else{
				if(ix%2 == 0) ix--;
				else ix>>=1;
			}
		}
		return ix-j2;
	}
} ho, ver;

int H, W, Q;
map<pair<int,int>, lld> vd, hd;

lld verti(int, int);
lld hori(int, int);

lld verti(int h, int v){
	int gap = vd[make_pair(h,v)];
	if(gap) return gap;

	lld up=0, down=0;
	up = ho.getup(h+1, ver[v]);
	if(up<=H) up = up-h + hori(v, up);
	else up = H-h;
	down = ho.getdown(h-1, ver[v]);
	if(down>=1) down = h-down + hori(v, down);
	else down = h-1;
	return vd[make_pair(h,v)] = max(up, down);
}

lld hori(int v, int h){
	int gap = hd[make_pair(h,v)];
	if(gap) return gap;

	lld up=0, down=0;
	up = ver.getup(v+1, ho[h]);
	if(up<=W) up = up-v + verti(h, up);
	else up = W-v;
	down = ver.getdown(v-1, ho[h]);
	if(down>=1) down = v-down + verti(h, down);
	else down = v-1;

	return hd[make_pair(h,v)] = max(up, down);
}

int main(){
	scanf("%d%d%d", &H, &W, &Q);
	for(int i=1; i<=H; i++){
		int a; scanf("%d", &a);
		ho.add(i, a);
	}
	for(int i=1; i<=W; i++){
		int a; scanf("%d", &a);
		ver.add(i, a);
	}
	while(Q--){
		int h, v;
		scanf("%d%d", &h, &v);
		printf("%lld\n", max(verti(h, v), hori(v, h)));
	}
	return 0;
}

Compilation message (stderr)

abduction2.cpp: In function 'int main()':
abduction2.cpp:85:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d", &H, &W, &Q);
                             ^
abduction2.cpp:87:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int a; scanf("%d", &a);
                         ^
abduction2.cpp:91:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int a; scanf("%d", &a);
                         ^
abduction2.cpp:96:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &h, &v);
                        ^

• Subtask 1: 13 / 13
• Subtask 2: 10 / 10
• Subtask 3: 17 / 17
• Subtask 4: 4 / 4
• Subtask 5: 0 / 56