Go: package main

/*
連鎖行列積
*/

import (
	"bufio"
	"bytes"
	"fmt"
	"log"
	"math"
	"os"
	"strconv"
	"strings"
)

func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}

type mem *[][]int

func main() {
	scanner := makeScanner(1024)
	n := eGetInt(scanner)
	p := make([]int, n+1)
	for i := 0; i < n; i++ {
		rowcol := eGetInts(scanner)
		p[i] = rowcol[0]
		p[i+1] = rowcol[1]
	}
	m := make([][]int, n)
	for i := 0; i < n; i++ {
		m[i] = make([]int, n)
	}
	// 初期値の格納
	for i := 0; i < n; i++ {
		for j := i; j < n; j++ {
			if i == j {
				m[i][j] = 0 //  同じ行列へのコストは当然0
			} else {
				m[i][j] = math.MaxInt64
			}
		}
	}

	// num : 行列の数. num == 1の場合は初期値0を格納ずみ
	for num := 2; num <= n; num++ {
		// s : スタート行列番号
		for s := 0; s+num <= n; s++ {
			// t : 終了行列番号
			t := s + num - 1
			// k : 仕切
			for k := s; k < t; k++ {
				m[s][t] = min(m[s][t], m[s][k]+m[k+1][t]+p[s]*p[k+1]*p[t+1])
			}
		}
	}
	fmt.Println(m[0][n-1])
}

////////////////////////////////////////////////////////////////////////////////
// ライブラリ
////////////////////////////////////////////////////////////////////////////////
func makeScanner(maxByte int) *bufio.Scanner {
	scanner := bufio.NewScanner(os.Stdin)
	scanner.Buffer(make([]uint8, 0, 8192), maxByte)
	return scanner
}
func makeWordScanner() *bufio.Scanner {
	scanner := makeScanner(8192)
	scanner.Split(bufio.ScanWords)
	return scanner
}
func eGetLine(r *bufio.Scanner) string {
	if r.Scan() {
		return r.Text()
	}
	err := r.Err()
	if err != nil {
		log.Fatal(err)
	}
	// EOF
	return ""
}
func eGetInt(r *bufio.Scanner) int {
	line := eGetLine(r)
	return eAtoi(line)
}
func eGetFields(r *bufio.Scanner) []string {
	line := eGetLine(r)
	return strings.Fields(line)
}
func eGetInts(r *bufio.Scanner) []int {
	fields := eGetFields(r)
	ints := make([]int, len(fields))
	for i := 0; i < len(ints); i++ {
		ints[i] = eAtoi(fields[i])
	}
	return ints
}
func eGetChars(r *bufio.Scanner) []string {
	line := eGetLine(r)
	return strings.Split(line, "")
}
func eAtoi(s string) int {
	n, err := strconv.Atoi(s)
	if err != nil {
		log.Fatal(err)
	}
	return n
}

type ints []int

func (s ints) String() string {
	var buf bytes.Buffer
	buf.WriteString("[")
	sep := ""
	for _, v := range s {
		buf.WriteString(fmt.Sprintf("%s%d", sep, v))
		sep = ", "
	}
	buf.WriteString("]")
	return buf.String()
}

func reverse(a ints) ints {
	r := make(ints, len(a))
	for i := 0; i < len(a); i++ {
		r[i] = a[len(a)-1-i]
	}
	return r
}
func max(a ints) (int, bool) {
	if len(a) == 0 {
		return 0, false
	}
	m := a[0]
	for _, e := range a {
		if e > m {
			m = e
		}
	}
	return m, true
}

// func min(a []int) int {
// 	m := a[0]
// 	for _, v := range a {
// 		if v < m {
// 			m = v
// 		}
// 	}
// 	return m
// }

func sum(a ints) int {
	if len(a) == 0 {
		return 0
	}
	sum := 0
	for _, e := range a {
		sum += e
	}
	return sum
}
func find(n int, a ints) int {
	for i, v := range a {
		if n == v {
			return i
		}
	}
	return -1
}

Python: def matrix_chmul(matrices):
    length = len(matrices)
    dp = [[0 for n in range(length)] for m in range(length)]
    rowcol = []
    for i in range(length):
        rowcol.extend(matrices[i])
    for i in range(1, length):
        for j in range(length - i):
            if i == 1:
                dp[j][i + j] = rowcol[j * 2] * rowcol[(i + j) * 2] * rowcol[(i + j) * 2 + 1]
            else:
                temp_min = float("inf")
                for k in range(0, i):
                    # print(i, j, k, dp[j][j + k], dp[j + k + 1][i + j])
                    dp[j][i + j] = min(temp_min, (dp[j][j + k] + dp[j + k + 1][i + j] + rowcol[j * 2] * rowcol[(j + k + 1) * 2] * rowcol[(i + j) * 2 + 1] ))
                    temp_min = dp[j][i + j]
        # print(dp)
    return dp[0][length - 1]

length = int(input())
matrices = [[0 for n in range(2)] for m in range(length)]
for _ in range(length):
    x, y = [int(n) for n in input().split(" ")]
    matrices[_] = x, y
print(matrix_chmul(matrices))

Python: import sys, itertools

n = int(sys.stdin.readline())
MM = [list(map(int, sys.stdin.readline().split())) for _ in range(n)]

amin = 0
m = MM[0][:]
for i in range(n-1):
    amin += m[0]*m[1]*MM[i+1][1]
    m[1]=MM[i+1][1]


for t in itertools.permutations(range(n-1), n-2):

    mm=[m[:] for m in MM]
    o = list(t)
    ans=0
    for _ in range(n-2):
        i = o.pop(0)
        ans += mm[i][0]*mm[i+1][1]*mm[i][1]
        if ans>amin: break
        mm[i][1] = mm[i+1][1]
        mm.pop(i+1)
        
        for j in range(len(o)):
            if o[j]>i: o[j] -=1
    else:
        ans += mm[0][0]*mm[0][1]*mm[1][1]
        if amin>ans: amin=ans


print(amin)

Python: def multi_chain_multiplication(n, P):
    M = [[0]*(n+1) for _ in range(n+1)]

    if n > 1:
        for l in range(2, n+1):
            for i in range(1, n-l+2):
                j = i + l - 1
                M[i][j] = float('inf')
                for k in range(i, j):
                    M[i][j] = min(M[i][j], M[i][k] + M[k+1][j] + P[i-1] * P[k] * P[j])
        return M[i][j]
    else:
        return 0

def read_and_print_min_multiplication(n):
    P = [0] * (n+1)
    for i in range(n):
        A = [int(i) for i in input().split()]
        if i == 0:
            P[i] = A[0]
            P[i+1] = A[1]
        else:
            P[i+1] = A[1]
    print(multi_chain_multiplication(n, P))

n = int(input())
read_and_print_min_multiplication(n)

Python: #!usr/bin/env python3
from collections import defaultdict,deque
from heapq import heappush, heappop
from itertools import permutations
import sys
import math
import bisect
def LI(): return [int(x) for x in sys.stdin.readline().split()]
def I(): return int(sys.stdin.readline())
def LS():return [list(x) for x in sys.stdin.readline().split()]
def S():
    res = list(sys.stdin.readline())
    if res[-1] == "\n":
        return res[:-1]
    return res
def IR(n):
    return [I() for i in range(n)]
def LIR(n):
    return [LI() for i in range(n)]
def SR(n):
    return [S() for i in range(n)]
def LSR(n):
    return [LS() for i in range(n)]

sys.setrecursionlimit(1000000)
mod = 1000000007

def solve():
    n = I()
    g = LIR(n)
    dp = [[float("inf")]*(n+1) for i in range(n)]
    for i in range(n):
        dp[i][i+1] = 0
    for k in range(1,n+1):
        for l in range(n):
            hl,wl = g[l]
            r = l+k
            if r > n:
                break
            hr,wr = g[r-1]
            nd = dp[l][r]
            for j in range(l+1,r):
                hj,wj = g[j-1]
                cost = hl*wj*wr
                nd = min(nd,dp[l][j]+dp[j][r]+cost)
            if nd < dp[l][r]:
                dp[l][r] = nd
    print(dp[0][n])
    return

#Solve
if __name__ == "__main__":
    solve()

Python: # https://onlinejudge.u-aizu.ac.jp/problems/ALDS1_10_B
import functools

INF = float('inf')
@functools.lru_cache(maxsize=None)
def rec(l, r):
    if l + 1 == r:
        return 0
    ret = INF
    for mid in range(l+1, r):
        ret = min(ret, rec(l, mid) + rec(mid, r)+R[l]*R[mid]*C[r-1])
    return ret


if __name__ == "__main__":
    N = int(input())
    R = []
    C = []
    for _ in range(N):
        r, c = list(map(int, input().split()))
        R.append(r)
        C.append(c)

    print(rec(0, N))

Python: n = int(input())

N = 101

p = [0] * N
m = [[0] * N for _ in range(N)]

for i in range(1, n + 1):
	p[i - 1], p[i] = map(int, input().split())

# print(p)

for l in range(2, n + 1):
	for i in range(1, n - l + 2):
		j = i + l - 1
		m[i][j] = float('inf')
		for k in range(i, j):
			m[i][j] = min(m[i][j], m[i][k] + m[k + 1][j] + p[i - 1] * p[k] * p[j])

print(m[1][n])