1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
#include <iostream>
#include <vector>

using namespace std;

struct Color {
    int y;
    int b;
    int r;

    Color(int y = 0, int b = 0, int r = 0) : y(y), b(b), r(r) {}

    Color mix(Color other) const {
        return Color(y + other.y, b + other.b, r + other.r);
    }

    bool is_yellow() const {
        return y > 0 && b == 0 && r == 0;
    }

    bool is_blue() const {
        return y == 0 && b > 0 && r == 0;
    }

    bool is_red() const {
        return y == 0 && b == 0 && r > 0;
    }

    bool is_green() {
        return y > 0 && b > 0 && r == 0;
    }

    bool is_orange() const {
        return y > 0 && b == 0 && r > 0;
    }

    bool is_purple() const {
        return y == 0 && b > 0 && r > 0;
    }

    bool is_brown() const {
        return y > 0 && b > 0 && r > 0;
    }

    int& operator[](const int index) {
        switch(index) {
            case 0:
                return y;
            case 1:
                return b;
            case 2:
                return r;
        }
        return r;
    }
};

struct Event {
    Color begin;
    Color end;
};

void solve();
vector<Event> read_events(const int can_count, const int operation_count);

int main() {
    solve();
    return 0;
}

void solve() {
    int can_count, operation_count;
    cin >> can_count >> operation_count;
    auto events = read_events(can_count, operation_count);
    Color color;
    int green_count = 0;
    for(const Event& event : events) {
        color = color.mix(event.end).mix(event.begin);
        if(color.is_green())
            green_count++;
    }
    cout << green_count << endl;
}

vector<Event> read_events(const int can_count, const int operation_count) {
    vector<Event> events(can_count + 1);
    for(int i = 0; i < operation_count; i++) {
        int left, right, color_code;
        cin >> left >> right >> color_code;
        Color positive;
        positive[color_code - 1] = 1;
        events[left - 1].begin = events[left - 1].begin.mix(positive);
        Color negative;
        negative[color_code - 1] = -1;
        events[right].end = events[right].end.mix(negative);
    }
    return events;
}