1 #include<iostream>
2 using namespace std;
3 int page[] = { 7,0,1,2,0,3,0,4,2,3,0,3,2,1,2,0,1,7,0,1,-1 };
4 void FIFO();
5 void OPT();
6 void RLU();
7 bool inArray(int* a, int n, int p);
8 int main(void) {
9 FIFO();
10 OPT();
11 RLU();
12 system("pause");
13 }
14 void FIFO() {
15 int temp[3] = { -1,-1,-1 };
16 int time[3] = { 0,0,0 };
17 int num = 0;
18 int error = 0;
19 cout << "FIFO:" << endl;
20 while (page[num] != -1) {
21 if (inArray(temp, 3, page[num])) {
22 std::cout << page[num] << ',';
23 std::cout << endl;
24 }
25 else {
26 error++;
27 bool hasChanged = false;
28 for (int i = 0; i < 3; i++) {
29 if (time[i] == 0 && hasChanged == false) {
30 time[i] = 2;
31 temp[i] = page[num];
32 hasChanged = true;
33 }
34 if (time[i] != 0) {
35 time[i]--;
36 }
37 }
38 std::cout << page[num] << ',' << ' ';
39 for (size_t i = 0; i < 3; i++) {
40 if (temp[i] == -1) {
41 std::cout << '*' << ' ';
42 }
43 else {
44 std::cout << temp[i] << ' ';
45 }
46 }
47 std::cout << endl;
48 }
49 num++;
50 }
51 cout << "错误率:" << error << endl;
52 }
53 bool inArray(int* a, int n, int p) {
54 for (int i = 0; i < n; i++) {
55 if (p == a[i]) {
56 return true;
57 }
58 }
59 return false;
60 }
61 void OPT() {
62 int temp[3] = { -1,-1,-1 };
63 int num = 0;
64 int error = 0;
65 //OPT已知未来的页数为20
66 cout << "OPT:" << endl;
67 while (page[num] != -1) {
68 int a = page[num];
69 if (inArray(temp, 3, page[num])) {
70 std::cout << page[num] << ',';
71 std::cout << endl;
72 }
73 else {
74 error++;
75 bool fuck = false;
76 for (size_t i = 0; i < 3; i++){
77 if (temp[i] == -1) {
78 temp[i] = page[num];
79 fuck = true;
80 break;
81 }
82 }
83
84 if (fuck == false) {
85 int distance[3] = { 20,20,20 };
86 for (int i = 19; i >= num; i--) {
87 for (int j = 0; j < 3; j++) {
88 if (temp[j] == page[i] && (i - num) < distance[j]) {
89 distance[j] = i - num;
90 }
91 }
92 }
93 int k = 0;
94 int max = -1;
95 for (size_t i = 0; i < 3; i++) {
96 if (max < distance[i]) {
97 max = distance[i];
98 k = i;
99 }
100 }
101 temp[k] = page[num];
102 }
103 std::cout << page[num] << ',' << ' ';
104 for (size_t i = 0; i < 3; i++) {
105 if (temp[i] == -1) {
106 std::cout << '*' << ' ';
107 }
108 else {
109 std::cout << temp[i] << ' ';
110 }
111 }
112 std::cout << endl;
113 }
114 num++;
115 }
116 cout << "错误率:" << error << endl;
117 }
118 void RLU(){
119 int temp[3] = { -1,-1,-1 };
120 int time[3] = { -1,-1,-1 };
121 int num = 0;
122 int error = 0;
123 cout << "RLU:" << endl;
124 while (page[num] != -1) {
125 int a = page[num];
126 if (inArray(temp, 3, page[num])) {
127 std::cout << page[num] << ',';
128 std::cout << endl;
129 //bool Changed = false;
130 for (int i = 0; i < 3; i++) {
131 if (temp[i] == page[num]) {
132 time[i] = 2;
133 //Changed = true;
134 }
135 if (temp[i] != page[num]&&time[i]!=0) {
136 time[i]--;
137 }
138 }
139 }
140 else {
141 error++;
142 //bool hasChange = false;
143 for (size_t i = 0; i < 3; i++){
144 if (temp[i] == -1) {
145 temp[i] = page[num];
146 time[i] = 2;
147 break;
148 }
149 if(time[i] == 0) {
150 temp[i] = page[num];
151 time[i] = 2;
152 }
153 else {
154 time[i]--;
155 }
156 }
157 std::cout << page[num] << ',' << ' ';
158 for (size_t i = 0; i < 3; i++) {
159 if (temp[i] == -1) {
160 std::cout << '*' << ' ';
161 }
162 else {
163 std::cout << temp[i] << ' ';
164 }
165 }
166 std::cout << endl;
167 }
168 num++;
169 }
170 cout << "错误率:" << error << endl;
171 }
