oj.uz

Submission #198152

# Submission time Handle Problem Language Result Execution time Memory
198152 2020-01-24T22:00:00 Z popovicirobert Lightning Rod (NOI18_lightningrod) C++14
100 / 100
 980 ms 260176 KB 
#include <bits/stdc++.h>
#define lsb(x) (x & (-x))
#define ll long long
#define ull unsigned long long
#define uint unsigned int


using namespace std;

const int MAXN = (int) 1e7 + 5;

int x[MAXN + 1], y[MAXN + 1];
int stk[MAXN + 1], sp[MAXN + 1];

inline int getnr() {
    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;
}

int main() {
#ifdef HOME
    ifstream cin("A.in");
    ofstream cout("A.out");
#endif
    int i, n;
    //ios::sync_with_stdio(false);
    //cin.tie(0), cout.tie(0);


    n = getnr();

    for(i = 1; i <= n; i++) {
        x[i] = getnr();
        y[i] = getnr();
    }

    stk[0] = -1;

    int sz = 0;
    for(i = 1; i <= n; i++) {
        while(sz > 0 && x[i] - x[stk[sz]] <= y[i] - y[stk[sz]]) {
            sz--;
        }
        sp[stk[sz] + 1]++;
        stk[++sz] = i;
    }

    sz = 0, stk[0] = n + 1;
    for(i = n; i >= 1; i--) {
        while(sz > 0 && x[stk[sz]] - x[i] <= y[i] - y[stk[sz]]) {
            sz--;
        }
        sp[stk[sz]]--;
        stk[++sz] = i;
    }

    int ans = 0;
    for(i = 1; i <= n; i++) {
        sp[i] += sp[i - 1];
        ans += (sp[i] == 1);
    }

    cout << ans;

    return 0;
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 566 ms 183884 KB Output is correct
2 Correct 574 ms 185076 KB Output is correct
3 Correct 551 ms 181148 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct

Subtask #3
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 376 KB Output is correct

Subtask #4
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 376 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 376 KB Output is correct

Subtask #5
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 376 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 26 ms 6052 KB Output is correct
15 Correct 22 ms 5984 KB Output is correct
16 Correct 19 ms 5624 KB Output is correct

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 581 ms 172776 KB Output is correct
2 Correct 582 ms 173300 KB Output is correct
3 Correct 570 ms 166304 KB Output is correct

Subtask #7
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 566 ms 183884 KB Output is correct
2 Correct 574 ms 185076 KB Output is correct
3 Correct 551 ms 181148 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 376 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 2 ms 376 KB Output is correct
15 Correct 2 ms 376 KB Output is correct
16 Correct 2 ms 376 KB Output is correct
17 Correct 26 ms 6052 KB Output is correct
18 Correct 22 ms 5984 KB Output is correct
19 Correct 19 ms 5624 KB Output is correct
20 Correct 581 ms 172776 KB Output is correct
21 Correct 582 ms 173300 KB Output is correct
22 Correct 570 ms 166304 KB Output is correct
23 Correct 980 ms 173272 KB Output is correct
24 Correct 946 ms 260176 KB Output is correct
25 Correct 904 ms 243916 KB Output is correct