Submission #219595

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
219595	2020-04-05T16:36:20 Z	GioChkhaidze	Lightning Rod (NOI18_lightningrod)	C++14	100 / 100	778 ms	236936 KB

lightningrod

#include <bits/stdc++.h>
using namespace std;
const int N=1e7+7;
bool f[N];
int n,x,y,X[N],Y[N],st[N],sts;

int getn() {
	char ch = getchar_unlocked();
    int ans = 0;
    while(!isdigit(ch)) {
        ch = getchar_unlocked();
    }
    while(isdigit(ch)) {
        ans = ans * 10 + ch - '0';
        ch = getchar_unlocked();
    }
    return ans;
}
 
main () {
	n=getn();
	for (int i=1; i<=n; i++) {
		x=getn();
		y=getn();
		X[i]=x-y;
		Y[i]=x+y;
	}
	
	for (int i=1; i<=n; i++) {
		if (sts) {
			while (sts && X[st[sts]]>=X[i]) {
				f[st[sts]]=1;
				--sts;
			}
		}
		st[++sts]=i;
	}

	sts=0;
	
	for (int i=n; i>=1; i--) {
		if (f[i]) continue;
		if (sts) {
			while (sts && Y[st[sts]]<=Y[i]) {
				--sts;
			}
		}
		st[++sts]=i;
	}
	cout<<sts;
}

Compilation message

lightningrod.cpp:20:7: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main () {
       ^

Subtask #1

4.0 / 4.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	459 ms	116344 KB	Output is correct
2	Correct	438 ms	114552 KB	Output is correct
3	Correct	470 ms	111480 KB	Output is correct

Subtask #2

7.0 / 7.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	5 ms	384 KB	Output is correct
2	Correct	4 ms	384 KB	Output is correct
3	Correct	4 ms	384 KB	Output is correct
4	Correct	5 ms	384 KB	Output is correct
5	Correct	4 ms	384 KB	Output is correct
6	Correct	4 ms	384 KB	Output is correct
7	Correct	4 ms	384 KB	Output is correct

Subtask #3

12.0 / 12.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	5 ms	384 KB	Output is correct
2	Correct	4 ms	384 KB	Output is correct
3	Correct	4 ms	384 KB	Output is correct
4	Correct	5 ms	384 KB	Output is correct
5	Correct	4 ms	384 KB	Output is correct
6	Correct	4 ms	384 KB	Output is correct
7	Correct	4 ms	384 KB	Output is correct
8	Correct	5 ms	384 KB	Output is correct
9	Correct	4 ms	384 KB	Output is correct
10	Correct	5 ms	384 KB	Output is correct

Subtask #4

21.0 / 21.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	5 ms	384 KB	Output is correct
2	Correct	4 ms	384 KB	Output is correct
3	Correct	4 ms	384 KB	Output is correct
4	Correct	5 ms	384 KB	Output is correct
5	Correct	4 ms	384 KB	Output is correct
6	Correct	4 ms	384 KB	Output is correct
7	Correct	4 ms	384 KB	Output is correct
8	Correct	5 ms	384 KB	Output is correct
9	Correct	4 ms	384 KB	Output is correct
10	Correct	5 ms	384 KB	Output is correct
11	Correct	5 ms	384 KB	Output is correct
12	Correct	5 ms	384 KB	Output is correct
13	Correct	5 ms	384 KB	Output is correct

Subtask #5

26.0 / 26.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	5 ms	384 KB	Output is correct
2	Correct	4 ms	384 KB	Output is correct
3	Correct	4 ms	384 KB	Output is correct
4	Correct	5 ms	384 KB	Output is correct
5	Correct	4 ms	384 KB	Output is correct
6	Correct	4 ms	384 KB	Output is correct
7	Correct	4 ms	384 KB	Output is correct
8	Correct	5 ms	384 KB	Output is correct
9	Correct	4 ms	384 KB	Output is correct
10	Correct	5 ms	384 KB	Output is correct
11	Correct	5 ms	384 KB	Output is correct
12	Correct	5 ms	384 KB	Output is correct
13	Correct	5 ms	384 KB	Output is correct
14	Correct	22 ms	4352 KB	Output is correct
15	Correct	21 ms	4480 KB	Output is correct
16	Correct	21 ms	4792 KB	Output is correct

Subtask #6

10.0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	475 ms	119472 KB	Output is correct
2	Correct	464 ms	117496 KB	Output is correct
3	Correct	451 ms	114808 KB	Output is correct

Subtask #7

20.0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	459 ms	116344 KB	Output is correct
2	Correct	438 ms	114552 KB	Output is correct
3	Correct	470 ms	111480 KB	Output is correct
4	Correct	5 ms	384 KB	Output is correct
5	Correct	4 ms	384 KB	Output is correct
6	Correct	4 ms	384 KB	Output is correct
7	Correct	5 ms	384 KB	Output is correct
8	Correct	4 ms	384 KB	Output is correct
9	Correct	4 ms	384 KB	Output is correct
10	Correct	4 ms	384 KB	Output is correct
11	Correct	5 ms	384 KB	Output is correct
12	Correct	4 ms	384 KB	Output is correct
13	Correct	5 ms	384 KB	Output is correct
14	Correct	5 ms	384 KB	Output is correct
15	Correct	5 ms	384 KB	Output is correct
16	Correct	5 ms	384 KB	Output is correct
17	Correct	22 ms	4352 KB	Output is correct
18	Correct	21 ms	4480 KB	Output is correct
19	Correct	21 ms	4792 KB	Output is correct
20	Correct	475 ms	119472 KB	Output is correct
21	Correct	464 ms	117496 KB	Output is correct
22	Correct	451 ms	114808 KB	Output is correct
23	Correct	776 ms	86832 KB	Output is correct
24	Correct	778 ms	236936 KB	Output is correct
25	Correct	762 ms	220764 KB	Output is correct