chapter_12 finished

Author: senrust

chapter_17/coin_problem/Cargo.lock

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+[package]
+name = "coin_problem"
+version = "0.1.0"
+authors = ["Yohei Osawa <[email protected]>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+input = {path = "../../library/input"}

chapter_17/coin_problem/Cargo.toml

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+15 6
+1 2 7 8 12 50

chapter_17/coin_problem/input.txt

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+fn main() {
+    let input_info: Vec<usize> = input::read_numline();
+    let target_value = input_info[0];
+    let coins: Vec<usize> = input::read_numline();
+
+    let mut coin_count: Vec<usize> = vec![100000000000000; target_value + 1];
+    coin_count[0] = 0;
+    for coin in coins {
+        let mut try_value = 1;
+        while try_value <= target_value {
+            if 0 > try_value as isize - coin as isize {
+                try_value += 1;
+                continue;
+            }
+            if coin_count[try_value] > coin_count[try_value - coin] + 1 {
+                coin_count[try_value] = coin_count[try_value - coin] + 1;
+            }
+            try_value += 1;
+        }
+    }
+    println!("answer is {}", coin_count[target_value]);
+}

chapter_17/coin_problem/src/main.rs

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+[package]
+name = "knapscack_problem"
+version = "0.1.0"
+authors = ["Yohei Osawa <[email protected]>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+input = {path = "../../library/input"}

chapter_17/knapscack_problem/Cargo.lock

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+#[derive(Clone, PartialEq)]
+enum Select {
+    UnSelect,
+    Select,
+}
+struct Object {
+    value: usize,
+    weight: usize,
+}
+
+fn main() {
+    let input_info: Vec<usize> = input::read_numline();
+    let object_num = input_info[0] + 1;
+    let max_weight = input_info[1];
+    let mut object_info: Vec<Object> = vec![];
+    let mut max_value: Vec<Vec<usize>> = vec![vec![0; max_weight + 1]; object_num];
+    let mut select_object: Vec<Vec<Select>> = vec![vec![Select:: UnSelect; max_weight + 1]; object_num]; 
+
+    for _ in 0..input_info[0] {
+        let input_object: Vec<usize> = input::read_numline();
+        let object = Object{value: input_object[0], weight: input_object[1]};
+        object_info.push(object);
+    }
+
+    for object_index in 1..object_num {
+        let object = &object_info[object_index - 1];
+        for weight in 1..=max_weight {
+            if weight < object.weight {
+                max_value[object_index][weight] = max_value[object_index - 1][weight] ;
+                continue;
+            } 
+            if max_value[object_index - 1][weight] < max_value[object_index - 1][weight - object.weight] + object.value {
+                max_value[object_index][weight] = max_value[object_index - 1][weight - object.weight] + object.value;
+                select_object[object_index][weight] = Select:: Select;
+            } else {
+                max_value[object_index][weight] = max_value[object_index - 1][weight] ;
+            }
+        }
+    }
+    let mut serachindex = input_info[0];
+    let mut search_weight = max_weight;
+
+    println!("max value is {}", max_value[object_num -1][max_weight]);
+
+    while serachindex >= 1 {
+        if select_object[serachindex][search_weight] == Select:: Select {
+            println!("object {} is selected", serachindex -1);
+            search_weight -= object_info[serachindex -1].weight;
+        }
+        serachindex -= 1;
+    }
+}