oj.uz

답안 #20398

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
20398 2017-02-10T19:12:17 Z admin 초음속철도 (OJUZ11_rail) C++11
100 / 100
 943 ms 25176 KB 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <memory.h>
#include <math.h>
#include <assert.h>
#include <stack>
#include <queue>
#include <map>
#include <set>
#include <algorithm>
#include <string>
#include <functional>
#include <vector>
#include <deque>
#include <utility>
#include <bitset>
#include <limits.h>
#include <time.h>
#include <functional>
#include <numeric>
 
using namespace std;
typedef long long ll;
typedef unsigned long long llu;
typedef double lf;
typedef unsigned int uint;
typedef long double llf;
typedef pair<int, int> pii;
typedef pair<ll, int> pli;
 
#define debug(format, ...) printf(format, __VA_ARGS__);
 
const int M_ = 200500;
const int MAX_TREE_SIZE = 1<<20;
 
const int MOD = (ll)1e9 + 7;
 
class modint {
	int v;
public:
	modint (): v(0) { }
	modint (ll v): v((v + MOD) % MOD) { }
 
	bool operator== (modint x) { return v == x.v; }
	bool operator!= (modint x) { return v != x.v; }
 
	modint operator+ (modint x) { return v + x.v; }
	modint operator- (modint x) { return v - x.v; }
	modint operator* (modint x) { return (ll)v * x.v; }
 
	modint& operator+= (const modint x) { return *this = (*this + x); }
	modint& operator-= (const modint x) { return *this = (*this - x); }
	modint& operator*= (const modint x) { return *this = (*this * x); }
 
	int operator* () { return v; }
};
 
int F, N, M;
vector< pair<int, int> > intervals;
vector< int* > renum;
 
// 서브태스크:
//	1. n, m <= 20
//	2. n <= 20 (합쳐서 10점)
//	3. n <= 1000, m <= 1000
//	4. 포함 관계
//	5. n <= 500000, m <= 500000
 
namespace segtree {
	struct node {
		modint sum, mul, add;
		node(modint sum = 0, modint mul = 1, modint add = 0): sum(sum), mul(mul), add(add) { }
	};
 
	vector<node> tree(MAX_TREE_SIZE + 1);
 
	void spread (int idx, int nl, int nr) {
		node& nd = tree[idx];
		node& c1 = (nl == nr) ? tree[0] : tree[idx * 2];
		node& c2 = (nl == nr) ? tree[0] : tree[idx * 2 + 1];
 
		if(nd.mul != 1) {
			nd.sum *= nd.mul;
			for(auto &child : {&c1, &c2}) {
				child->mul *= nd.mul;
				child->add *= nd.mul;
			}
			nd.mul = 1;
		}
 
		if(nd.add != 0) {
			nd.sum += nd.add * (nr - nl + 1);
			for(auto &child : {&c1, &c2}) {
				child->add += nd.add;
			}
			nd.add = 0;
		}
	}
 
	modint update (int idx, int nl, int nr, int l, int r, char type, modint v) {
		if(l > r) return 0;
		node &nd = tree[idx];
		spread(idx, nl, nr);
		if(l <= nl && nr <= r) {
			(type == '*' ? nd.mul : nd.add) = v;
			spread(idx, nl, nr);
			return nd.sum;
		}
		int nm = (nl + nr) >> 1;
		nd.sum = 0;
		if(l <= nm) nd.sum += update(idx*2,	 nl, nm,	 l, min(nm, r),	 type, v);
		if(r >	nm) nd.sum += update(idx*2+1, nm+1, nr, max(nm+1, l), r, type, v);
		return nd.sum;
	}
 
	void multiply(int l, int r, modint v) {
		update(1, 0, N, l, r, '*', v);
	}
 
	void add (int l, int r, modint v) {
		update(1, 0, N, l, r, '+', v);
	}
 
	modint get (int idx, int nl, int nr, int x) {
		spread(idx, nl, nr);
		if(nl == nr) return tree[idx].sum;
		int nm = (nl + nr) >> 1;
		return (x <= nm) ?
								get(idx*2,	 nl, nm,	 x) :
								get(idx*2+1, nm+1, nr, x);
	}
 
	modint get(int x) {
		return get(1, 0, N, x);
	}
};
 
modint ans;
 
int main() {
	assert(scanf("%d%d", &N, &M) == 2);
  while(M > 200000);
	intervals.resize(M);
	renum.reserve(2*M);
	for(auto &interval : intervals) {
		assert(scanf("%d%d", &interval.first, &interval.second) == 2);
		assert(1 <= interval.first && interval.first < interval.second && interval.second <= N);
		renum.push_back(&interval.first);
		renum.push_back(&interval.second);
	}
	F = 1;
	renum.push_back(&F);
	renum.push_back(&N);
 
 
	sort(renum.begin(), renum.end(), [&](const int *a, const int *b){
		return *a < *b;
	});
 
	for(int i = 0, k = 0; i < renum.size(); ) {
		int j = i, v = *renum[i];
		k += 1;
		for(; j < renum.size() && *renum[j] == v; j++) *renum[j] = k;
		i = j;
	}
 
	for(auto &interval : intervals) {
		interval.second -= 1;
	}
	sort(intervals.begin(), intervals.end());
	N -= 1;
 
	segtree::add(0, 0, 1);
	for(auto &interval : intervals) {
		int l, r; tie(l, r) = interval;
		modint v = segtree::get(l-1);
		segtree::multiply(0, l-1, 2);
		segtree::add(l, r, v);
		segtree::multiply(r+1, N, 2);
	}
 
	ans = segtree::get(N);
	printf("%d\n", *ans);
	return 0;
}

Compilation message

rail.cpp: In function 'int main()':
rail.cpp:161:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0, k = 0; i < renum.size(); ) {
                          ^
rail.cpp:164:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(; j < renum.size() && *renum[j] == v; j++) *renum[j] = k;
           ^

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 14232 KB Output is correct
2 Correct 3 ms 14232 KB Output is correct
3 Correct 3 ms 14232 KB Output is correct
4 Correct 0 ms 14232 KB Output is correct
5 Correct 0 ms 14232 KB Output is correct
6 Correct 3 ms 14232 KB Output is correct
7 Correct 6 ms 14232 KB Output is correct
8 Correct 0 ms 14232 KB Output is correct
9 Correct 0 ms 14232 KB Output is correct
10 Correct 3 ms 14232 KB Output is correct
11 Correct 0 ms 14232 KB Output is correct
12 Correct 6 ms 14232 KB Output is correct
13 Correct 0 ms 14232 KB Output is correct
14 Correct 0 ms 14232 KB Output is correct
15 Correct 0 ms 14232 KB Output is correct
16 Correct 0 ms 14232 KB Output is correct
17 Correct 3 ms 14232 KB Output is correct
18 Correct 0 ms 14232 KB Output is correct

Subtask #2
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 14232 KB Output is correct
2 Correct 3 ms 14232 KB Output is correct
3 Correct 3 ms 14232 KB Output is correct
4 Correct 0 ms 14232 KB Output is correct
5 Correct 0 ms 14232 KB Output is correct
6 Correct 3 ms 14232 KB Output is correct
7 Correct 6 ms 14232 KB Output is correct
8 Correct 0 ms 14232 KB Output is correct
9 Correct 0 ms 14232 KB Output is correct
10 Correct 3 ms 14232 KB Output is correct
11 Correct 0 ms 14232 KB Output is correct
12 Correct 6 ms 14232 KB Output is correct
13 Correct 0 ms 14232 KB Output is correct
14 Correct 0 ms 14232 KB Output is correct
15 Correct 0 ms 14232 KB Output is correct
16 Correct 0 ms 14232 KB Output is correct
17 Correct 3 ms 14232 KB Output is correct
18 Correct 0 ms 14232 KB Output is correct
19 Correct 3 ms 14232 KB Output is correct
20 Correct 3 ms 14232 KB Output is correct
21 Correct 0 ms 14232 KB Output is correct
22 Correct 0 ms 14232 KB Output is correct
23 Correct 0 ms 14232 KB Output is correct
24 Correct 0 ms 14232 KB Output is correct
25 Correct 6 ms 14232 KB Output is correct
26 Correct 3 ms 14232 KB Output is correct
27 Correct 0 ms 14232 KB Output is correct
28 Correct 3 ms 14232 KB Output is correct
29 Correct 3 ms 14232 KB Output is correct
30 Correct 3 ms 14232 KB Output is correct
31 Correct 3 ms 14232 KB Output is correct
32 Correct 0 ms 14232 KB Output is correct
33 Correct 0 ms 14232 KB Output is correct
34 Correct 0 ms 14232 KB Output is correct
35 Correct 0 ms 14232 KB Output is correct

Subtask #3
25.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 14232 KB Output is correct
2 Correct 6 ms 14232 KB Output is correct
3 Correct 0 ms 14232 KB Output is correct
4 Correct 13 ms 14584 KB Output is correct
5 Correct 366 ms 25176 KB Output is correct
6 Correct 526 ms 25176 KB Output is correct
7 Correct 506 ms 25176 KB Output is correct
8 Correct 0 ms 14232 KB Output is correct
9 Correct 466 ms 24352 KB Output is correct
10 Correct 499 ms 24896 KB Output is correct
11 Correct 276 ms 21008 KB Output is correct
12 Correct 533 ms 25176 KB Output is correct
13 Correct 513 ms 24980 KB Output is correct
14 Correct 99 ms 25176 KB Output is correct
15 Correct 483 ms 25176 KB Output is correct
16 Correct 106 ms 25176 KB Output is correct
17 Correct 519 ms 25176 KB Output is correct
18 Correct 506 ms 25176 KB Output is correct
19 Correct 516 ms 25176 KB Output is correct

Subtask #4
27.0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 14232 KB Output is correct
2 Correct 3 ms 14232 KB Output is correct
3 Correct 3 ms 14232 KB Output is correct
4 Correct 0 ms 14232 KB Output is correct
5 Correct 0 ms 14232 KB Output is correct
6 Correct 3 ms 14232 KB Output is correct
7 Correct 6 ms 14232 KB Output is correct
8 Correct 0 ms 14232 KB Output is correct
9 Correct 0 ms 14232 KB Output is correct
10 Correct 3 ms 14232 KB Output is correct
11 Correct 0 ms 14232 KB Output is correct
12 Correct 6 ms 14232 KB Output is correct
13 Correct 0 ms 14232 KB Output is correct
14 Correct 0 ms 14232 KB Output is correct
15 Correct 0 ms 14232 KB Output is correct
16 Correct 0 ms 14232 KB Output is correct
17 Correct 3 ms 14232 KB Output is correct
18 Correct 0 ms 14232 KB Output is correct
19 Correct 3 ms 14232 KB Output is correct
20 Correct 3 ms 14232 KB Output is correct
21 Correct 0 ms 14232 KB Output is correct
22 Correct 0 ms 14232 KB Output is correct
23 Correct 0 ms 14232 KB Output is correct
24 Correct 0 ms 14232 KB Output is correct
25 Correct 6 ms 14232 KB Output is correct
26 Correct 3 ms 14232 KB Output is correct
27 Correct 0 ms 14232 KB Output is correct
28 Correct 3 ms 14232 KB Output is correct
29 Correct 3 ms 14232 KB Output is correct
30 Correct 3 ms 14232 KB Output is correct
31 Correct 3 ms 14232 KB Output is correct
32 Correct 0 ms 14232 KB Output is correct
33 Correct 0 ms 14232 KB Output is correct
34 Correct 0 ms 14232 KB Output is correct
35 Correct 0 ms 14232 KB Output is correct
36 Correct 19 ms 14584 KB Output is correct
37 Correct 9 ms 14404 KB Output is correct
38 Correct 9 ms 14404 KB Output is correct
39 Correct 3 ms 14584 KB Output is correct
40 Correct 9 ms 14584 KB Output is correct
41 Correct 16 ms 14584 KB Output is correct
42 Correct 19 ms 14584 KB Output is correct
43 Correct 3 ms 14232 KB Output is correct
44 Correct 16 ms 14580 KB Output is correct
45 Correct 6 ms 14584 KB Output is correct
46 Correct 9 ms 14584 KB Output is correct
47 Correct 13 ms 14584 KB Output is correct
48 Correct 16 ms 14584 KB Output is correct
49 Correct 3 ms 14584 KB Output is correct
50 Correct 6 ms 14584 KB Output is correct
51 Correct 3 ms 14584 KB Output is correct
52 Correct 3 ms 14364 KB Output is correct
53 Correct 13 ms 14584 KB Output is correct
54 Correct 6 ms 14380 KB Output is correct
55 Correct 9 ms 14584 KB Output is correct

Subtask #5
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 14232 KB Output is correct
2 Correct 3 ms 14232 KB Output is correct
3 Correct 3 ms 14232 KB Output is correct
4 Correct 0 ms 14232 KB Output is correct
5 Correct 0 ms 14232 KB Output is correct
6 Correct 3 ms 14232 KB Output is correct
7 Correct 6 ms 14232 KB Output is correct
8 Correct 0 ms 14232 KB Output is correct
9 Correct 0 ms 14232 KB Output is correct
10 Correct 3 ms 14232 KB Output is correct
11 Correct 0 ms 14232 KB Output is correct
12 Correct 6 ms 14232 KB Output is correct
13 Correct 0 ms 14232 KB Output is correct
14 Correct 0 ms 14232 KB Output is correct
15 Correct 0 ms 14232 KB Output is correct
16 Correct 0 ms 14232 KB Output is correct
17 Correct 3 ms 14232 KB Output is correct
18 Correct 0 ms 14232 KB Output is correct
19 Correct 3 ms 14232 KB Output is correct
20 Correct 3 ms 14232 KB Output is correct
21 Correct 0 ms 14232 KB Output is correct
22 Correct 0 ms 14232 KB Output is correct
23 Correct 0 ms 14232 KB Output is correct
24 Correct 0 ms 14232 KB Output is correct
25 Correct 6 ms 14232 KB Output is correct
26 Correct 3 ms 14232 KB Output is correct
27 Correct 0 ms 14232 KB Output is correct
28 Correct 3 ms 14232 KB Output is correct
29 Correct 3 ms 14232 KB Output is correct
30 Correct 3 ms 14232 KB Output is correct
31 Correct 3 ms 14232 KB Output is correct
32 Correct 0 ms 14232 KB Output is correct
33 Correct 0 ms 14232 KB Output is correct
34 Correct 0 ms 14232 KB Output is correct
35 Correct 0 ms 14232 KB Output is correct
36 Correct 3 ms 14232 KB Output is correct
37 Correct 6 ms 14232 KB Output is correct
38 Correct 0 ms 14232 KB Output is correct
39 Correct 13 ms 14584 KB Output is correct
40 Correct 366 ms 25176 KB Output is correct
41 Correct 526 ms 25176 KB Output is correct
42 Correct 506 ms 25176 KB Output is correct
43 Correct 0 ms 14232 KB Output is correct
44 Correct 466 ms 24352 KB Output is correct
45 Correct 499 ms 24896 KB Output is correct
46 Correct 276 ms 21008 KB Output is correct
47 Correct 533 ms 25176 KB Output is correct
48 Correct 513 ms 24980 KB Output is correct
49 Correct 99 ms 25176 KB Output is correct
50 Correct 483 ms 25176 KB Output is correct
51 Correct 106 ms 25176 KB Output is correct
52 Correct 519 ms 25176 KB Output is correct
53 Correct 506 ms 25176 KB Output is correct
54 Correct 516 ms 25176 KB Output is correct
55 Correct 19 ms 14584 KB Output is correct
56 Correct 9 ms 14404 KB Output is correct
57 Correct 9 ms 14404 KB Output is correct
58 Correct 3 ms 14584 KB Output is correct
59 Correct 9 ms 14584 KB Output is correct
60 Correct 16 ms 14584 KB Output is correct
61 Correct 19 ms 14584 KB Output is correct
62 Correct 3 ms 14232 KB Output is correct
63 Correct 16 ms 14580 KB Output is correct
64 Correct 6 ms 14584 KB Output is correct
65 Correct 9 ms 14584 KB Output is correct
66 Correct 13 ms 14584 KB Output is correct
67 Correct 16 ms 14584 KB Output is correct
68 Correct 3 ms 14584 KB Output is correct
69 Correct 6 ms 14584 KB Output is correct
70 Correct 3 ms 14584 KB Output is correct
71 Correct 3 ms 14364 KB Output is correct
72 Correct 13 ms 14584 KB Output is correct
73 Correct 6 ms 14380 KB Output is correct
74 Correct 9 ms 14584 KB Output is correct
75 Correct 889 ms 25176 KB Output is correct
76 Correct 546 ms 21412 KB Output is correct
77 Correct 419 ms 24676 KB Output is correct
78 Correct 99 ms 25176 KB Output is correct
79 Correct 556 ms 25124 KB Output is correct
80 Correct 943 ms 25176 KB Output is correct
81 Correct 13 ms 14584 KB Output is correct
82 Correct 819 ms 24812 KB Output is correct
83 Correct 76 ms 25176 KB Output is correct
84 Correct 739 ms 25176 KB Output is correct
85 Correct 749 ms 25176 KB Output is correct
86 Correct 743 ms 25176 KB Output is correct
87 Correct 226 ms 25176 KB Output is correct
88 Correct 186 ms 25176 KB Output is correct
89 Correct 889 ms 25176 KB Output is correct
90 Correct 906 ms 25176 KB Output is correct
91 Correct 893 ms 25176 KB Output is correct
92 Correct 703 ms 24972 KB Output is correct
93 Correct 753 ms 25176 KB Output is correct
94 Correct 876 ms 25176 KB Output is correct
95 Correct 899 ms 25176 KB Output is correct