Submission #30072

#	Time	Username	Problem	Language	Result	Execution time	Memory
30072		tlwpdus	Untitled (POI11_tem)	C++11	100 / 100	439 ms	12604 KiB

Main

#include <bits/stdc++.h>

using namespace std;

typedef pair<int,int> pii;
int n;
int S[1000100], E[1000100];
deque<pii> dq;

void push(pii a) {
	while(!dq.empty()&&dq.back().second<=a.second) dq.pop_back();
	dq.push_back(a);
}

int main() {
	int i, j, res = 1;

	scanf("%d",&n);
	for (i=0;i<n;i++) scanf("%d%d",&S[i],&E[i]);
	i = 0; j = -1;
	for (;i<n;i++) {
		if (!dq.empty()&&dq.front().first<i) dq.pop_front();
		if (j<i) {j=i;push(pii(j,S[j]));}
		for (;j+1<n;) {
			if (dq.front().second<=E[j+1]) {j++;push(pii(j,S[j]));}
			else break;
		}
		res = max(res,j-i+1);
	}
	printf("%d\n",res);

    return 0;
}

Compilation message (stderr)

tem.cpp: In function 'int main()':
tem.cpp:18:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
                ^
tem.cpp:19:45: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for (i=0;i<n;i++) scanf("%d%d",&S[i],&E[i]);
                                             ^

• Subtask 1: 8 / 8
• Subtask 2: 8 / 8
• Subtask 3: 8 / 8
• Subtask 4: 8 / 8
• Subtask 5: 8 / 8
• Subtask 6: 8 / 8
• Subtask 7: 8 / 8
• Subtask 8: 8 / 8
• Subtask 9: 9 / 9
• Subtask 10: 9 / 9
• Subtask 11: 9 / 9
• Subtask 12: 9 / 9