oj.uz

Submission #21855

# Submission time Handle Problem Language Result Execution time Memory
21855 2017-04-26T12:38:54 Z ulna Schools (IZhO13_school) C++11
100 / 100
 176 ms 10208 KB 
#include <bits/stdc++.h>
using namespace std;

// why am I so weak

int n, m, s;
int a[300055], b[300055];

int group[300055];

struct compare1 {
	bool operator () (const int &u, const int &v) const {
		return a[u] < a[v];
	}
} ;
struct compare2 { 
	bool operator () (const int &u, const int &v) const {
		return b[u] < b[v];
	}
} ;
int main() {
	scanf("%d %d %d", &n, &m, &s);

	for (int i = 0; i < n; i++) {
		scanf("%d %d", &a[i], &b[i]);
	}

	vector<int> vec(n);

	for (int i = 0; i < n; i++) vec[i] = i;

	sort(vec.begin(), vec.end(), [&] (int u, int v) {
		return a[u] > a[v];
	});

	long long res = 0ll;

	// from a->b, nothing->a, -a[i] + b[i] + a[j]
	// from nothing->b, +b[j]
		
	priority_queue<int> a;
	priority_queue<int, vector<int>, compare1> c;
	priority_queue<int, vector<int>, compare2> d;

	for (int i = 0; i < m; i++) {
		res += ::a[vec[i]];
		group[vec[i]] = 1;
		a.push(-::a[vec[i]] + b[vec[i]]);
	}

	for (int i = m; i < n; i++) {
		c.push(vec[i]);
		d.push(vec[i]);
	}

	for (int i = 0; i < s; i++) {
		while (group[c.top()] != 0) c.pop();
		while (group[d.top()] != 0) d.pop();

		if (a.empty() || a.top() + ::a[c.top()] < b[d.top()]) {
			res += b[d.top()];
			group[d.top()] = 2;
			d.pop();
		} else {
			res += a.top() + ::a[c.top()];
			group[c.top()] = 1;
			a.pop();
			a.push(-::a[c.top()] + b[c.top()]);
			c.pop();
		}
	}

	printf("%lld\n", res);

	return 0;
}

Compilation message

school.cpp: In function 'int main()':
school.cpp:22:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d", &n, &m, &s);
                               ^
school.cpp:25:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &a[i], &b[i]);
                               ^

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 5540 KB Output is correct
2 Correct 0 ms 5540 KB Output is correct
3 Correct 0 ms 5540 KB Output is correct
4 Correct 0 ms 5540 KB Output is correct
5 Correct 0 ms 5540 KB Output is correct
6 Correct 0 ms 5540 KB Output is correct
7 Correct 0 ms 5676 KB Output is correct
8 Correct 0 ms 5696 KB Output is correct
9 Correct 0 ms 5540 KB Output is correct
10 Correct 0 ms 5540 KB Output is correct
11 Correct 0 ms 5676 KB Output is correct
12 Correct 0 ms 5680 KB Output is correct
13 Correct 19 ms 5956 KB Output is correct
14 Correct 43 ms 7344 KB Output is correct
15 Correct 76 ms 8808 KB Output is correct
16 Correct 169 ms 9152 KB Output is correct
17 Correct 159 ms 9896 KB Output is correct
18 Correct 159 ms 9980 KB Output is correct
19 Correct 159 ms 10056 KB Output is correct
20 Correct 176 ms 10208 KB Output is correct