Submission #147003

#	Time	Username	Problem	Language	Result	Execution time	Memory
147003		jun6873	Lightning Rod (NOI18_lightningrod)	C++11	100 / 100	679 ms	190460 KiB

Main

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

using lint = long long;
using pint = pair<lint, lint>;
#define x first
#define y second

const int maxn = 10000004;
int n, k, b[maxn];
pint a[maxn];

static char buf[1 << 19]; // size : any number geq than 1024
static int idx = 0;
static int bytes = 0;
static inline int _read() {
    if (!bytes || idx == bytes) {
        bytes = (int)fread(buf, sizeof(buf[0]), sizeof(buf), stdin);
        idx = 0;
    }
    return buf[idx++];
}
static inline int _readInt() {
    int x = 0, s = 1;
    int c = _read();
    while (c <= 32) c = _read();
    if (c == '-') s = -1, c = _read();
    while (c > 32) x = 10 * x + (c - '0'), c = _read();
    if (s < 0) x = -x;
    return x;
}

int main() {
    n = _readInt();
    for (int i=0; i<n; i++) {
        int x, y;
        x = _readInt(); y = _readInt();
        a[i] = pint(x+y, y-x);
    }

    for (int i=0; i<n; i++) {
        while (k and a[b[k-1]].y <= a[i].y) k--;
        if (!k or a[b[k-1]].x < a[i].x) b[k++] = i;
    }

    cout << k << '\n';
}

• Subtask 1: 4 / 4
• Subtask 2: 7 / 7
• Subtask 3: 12 / 12
• Subtask 4: 21 / 21
• Subtask 5: 26 / 26
• Subtask 6: 10 / 10
• Subtask 7: 20 / 20