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: n = int(input())
P = list(map(int,input().split()))
for _ in range(n-1):
    P.append(int(input().split()[1]))

INF = 10**18
dp = [[INF]*(n) for i in range(n)]

for i in range(n):#一つの行列部分にゼロを入れる
    dp[i][i] = 0

for l in range(1,n):
    for i in range(n-l):
        j = i + l
        dp[i][j] = INF
        for k in range(i,j):
            dp[i][j] = min(dp[i][j], dp[i][k] + dp[k + 1][j] + P[i-1] * P[k] * P[j])

print(dp[0][n-1])

Python: n = int(input())
rc = [[0, 0]]+[list(map(int, input().split())) for i in range(n)]
m = [[0]*(n+1) for _ in range(n+1)]

for l in range(2, n+1):
    for i in range(1, n-l+2):
        j = i+l-1
        m[i][j] = 2**64
        for k in range(i, j):
            m[i][j] = min([
                m[i][j],
                m[i][k]+m[k+1][j]+rc[i][0]*rc[k+1][0]*rc[j][1]
            ])
print(m[1][n])

Python: def memoize(f):  
    cache = {}  
    def helper(x):  
        if x not in cache:              
            cache[x] = f(x)  
        return cache[x]  
    return helper 

def split_rc(rc):
    for i in range(1, len(rc)):
        yield rc[:i], rc[i:]

@memoize
def cost(rc):
    if len(rc) == 1:
        return 0
    return min(calc_cost(first, second) for first, second in split_rc(rc))

def calc_cost(first, second):
    return cost(first) + cost(second) + first[0][0] * first[-1][1] * second[-1][1]

n = int(input())
rc = tuple(tuple(map(int, input().split())) for _ in range(n))
print(cost(rc))

Python: n = int(input())
data = []
for i in range(n):
    data.append(list(map(int, input().split())))

memo = []
for _ in range(n):
    memo.append([-1]*n)


def mul(i, j):
    if i == j:
        return 0
    if memo[i][j] >= 0:
        return memo[i][j]
    num = 100000
    for k in range(i, j):
        num = min(num, mul(i, k) + mul(k+1, j) + data[i][0] * data[k][1] * data[j][1])
    memo[i][j] = num
    return memo[i][j]

print(mul(0, n-1))

Python: import sys, copy

num = int(sys.stdin.readline())

if num==1:
    print(0)
    quit()
    
mm = list(map(int, sys.stdin.readline().split()))
for _ in range(num-1):
    mm.append(int(sys.stdin.readline().split()[1]))

used = [False] * num
seq = [0] * (num-2)
minv = 0
j=mm[1]
for i in mm[2:]:
    minv += i*j
    j=i
minv *= mm[0]    

print('min=',minv)
def sequence(n, k, m, t):
    global minv, used, seq
    if k==m:
        t += mm[0]*mm[used[1:].index(False)+1]*mm[num]
        if minv>t:    minv = t
    else:
        for i in range(1,n+1):
            if used[i]: continue
            seq[m] = i
            used[i]=True

            l=i-1
            while l>0 and used[l]:     l-=1
            u=i+1
            while u<num and used[u]:   u+=1
            v = mm[l]*mm[i]*mm[u]
            if minv>t+v: sequence(n, k, m+1, t+v)
            used[i]=False

sequence(num-1, num-2, 0, 0)

print(minv)

Python: #!/usr/bin/env python3
# -*- coding: utf-8 -*-

import sys
import re
import math
import collections
import itertools
import functools
import logging

logging.basicConfig(level=logging.DEBUG, format="DBG: %(message)s")

def dbg(msg, *args, **kwargs):
    logging.debug(msg, *args, **kwargs)

Mat = collections.namedtuple("Mat", "r c")

def mat_mul(ms):
    return Mat(ms[0].r, ms[-1].c)

def cost(m1, m2):
    return m1.r * m1.c * m2.c

def solve(n, ms):
    if n == 1: return 0

    dp = {}
    for i in range(n):
        dp[(i,i)] = 0

    for l in range(2, n+1):
        for i in range(n-l+1):
            #cost_min = math.inf
            cost_min = float("inf")
            for j in range(l-1):
                #dbg("l, i, j: %d %d %d", l, i, j)
                m_lhs = mat_mul(ms[i:i+j+1])
                m_rhs = mat_mul(ms[i+j+1:i+l])
                #dbg("m_lhs, m_rhs: %r %r", m_lhs, m_rhs)
                cost_lhs = dp[(i,i+j)]
                cost_rhs = dp[(i+j+1,i+l-1)]
                #dbg("cost_lhs, cost_rhs: %d %d", cost_lhs, cost_rhs)
                cost_mul = cost(m_lhs, m_rhs)
                #dbg("cost_mul: %d", cost_mul)
                cost_now = cost_mul + cost_lhs + cost_rhs
                #dbg("cost_now: %d", cost_now)
                if cost_min > cost_now:
                    cost_min = cost_now
            dp[(i,i+l-1)] = cost_min

    #dbg(dp)
    return dp[(0,n-1)]

def main():
    n = int(input())

    ms = []
    for _ in range(n):
        r,c = map(int, input().split())
        ms.append(Mat(r,c))

    print(solve(n, ms))

if __name__ == "__main__": main()

Python: n = int(input())
r=[0]*(n+1)
c=[0]*(n+1)
for i in range(n):
    r[i+1], c[i+1] = map(int, input().split())

dp = [[float('inf') for i in range(n+1)] for j in range(n+1)]

for i in range(n+1):
    dp[i][i] = 0

# print("")
for l in range(2, n+1):
    for i in range(1, n-l+2):
        # print("l=", l, "i=", i)
        tmp_list = [r[i] * c[i+l-1] * r[j+1] + dp[i][j] + dp[j+1][i+l-1] for j in range(i, i+l-1)]
        dp[i][i+l-1] = min(tmp_list)

print(dp[1][n])