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: from functools import lru_cache, reduce
from sys import stdin
from operator import mul

@lru_cache(maxsize=None)
def getMin(args:tuple):
    if len(args) == 2:
        return 0
    elif len(args) == 3:
        return reduce(mul, args)
    l = [(args[0:i+1], args[i:], args[0]*args[i]*args[-1]) for i in range(1, len(args)-1)]
    return min([getMin(v[0]) + getMin(v[1]) + v[2] for v in l])


n = int(input())
M = [tuple(map(int, line.split())) for line in stdin.readlines()]
R = tuple([M[0][0]] + [r[1] for r in M])
print(getMin(R))

Python: def s():
 n=int(input())+1
 e=[input().split()for _  in[0]*~-n]
 p=[int(e[0][0])]+list(int(x[1])for x in e)
 m=[[0]*n for _ in[0]*n]
 for i in range(1,n):
  for r in range(n-i-1):
   c=r+i+1
   for j in range(r+1,c):
    x=m[r][j]+m[j][c]+p[r]*p[j]*p[c]
    if 1>m[r][c]or m[r][c]>x:m[r][c]=x
 print(m[r][c])
if'__main__'==__name__:s()

Python: # http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=ALDS1_10_B&lang=jp
#  Matrix Chain Multiplication : python3
#  2018.12.03 yonezawa

from collections import deque
import sys
input = sys.stdin.readline

def main():
    nmax = 1000000
    n = int(input())
    p = []
    calc = [[nmax for i in range(n + 1)] for i in range(n + 1)]

    for i in range(n):
        (a,b) = map(int,input().split())
        p.append(a)
    else:
        p.append(b)

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

    for i in range(1,n):
        calc[i][i+1] = p[i-1] * p[i] * p[i +1] 
    
    for s in range(2,n):
        for i in range(1,n + 1 - s ):
#            print (i,i+s)
            for j in range(s):
                m = calc[i][i+j] + calc[i+j+1][i+s] + p[i-1]*p[i+j]* p[i+s]
#                print ("m=",m,"calc:",i,i+j,"+calc",i+j+1,i+s,"p:",i-1,i+j,i+s)
                if calc[i][i+s] > m:
                    calc[i][i+s] = m
    print (calc[1][n])
if __name__ == '__main__':
    main()

Python: n = int(input())
r = [0] * (n+1) # M1=r0*r1, M2=r1*r2, ... , Mn=rn-1*rn
m = [[100**4] * (n+1) for _ in range(n+1)] # m[i][j] = Mi...Mj の最小コスト
for i in range(n):
    r[i], r[i+1] = list(map(int, input().split()))

for i in range(1, n+1): # 1個の行列のコスト
    m[i][i] = 0
for i in range(1, n): # 2個の行列のコスト
    m[i][i+1] = r[i-1] * r[i] * r[i+1]
for j in range(2, n): # j+1 個の行列のコスト
    for i in range(1, n-j+1): # Mi...Mi+j
        for k in range(j): # Mi...Mi+k と Mi+k+1...Mi+j に分割
            # print('i=',i,' i+k=',i+k,' i+j=', i+j)
            cost = m[i][i+k] + r[i-1]*r[i+k]*r[i+j] + m[i+k+1][i+j]
            if cost < m[i][i+j]:
                m[i][i+j] = cost
print(m[1][n])

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

from sys import maxsize


def irange(start, stop=None):
    if stop:
        return range(start, stop + 1)
    else:
        return range(start + 1)


def count(ms):
    n = len(ms)

    p = [0] * (n + 1)
    for i in range(n):
        p[i] = ms[i][0]
        p[i + 1] = ms[i][1]

    m = [[None] * (n + 1) for _ in irange(n)]
    for i in irange(1, n):
        m[i][i] = 0
    for l in irange(2, n):
        for i in irange(1, n - l + 1):
            j = i + l - 1
            m[i][j] = maxsize
            for k in irange(i, j - 1):
                m[i][j] = min(
                    m[i][j],
                    m[i][k] + m[k + 1][j] + p[i - 1] * p[k] * p[j]
                )

    return m[1][n]


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

    m = []
    for _ in range(n):
        m.append(tuple(int(x) for x in input().split()))
    c = count(m)
    print(c)


if __name__ == '__main__':
    main()

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

DP = [[0]*N for _ in range(N)]
for l in range(2, N+1): # l は行列の数
    for i in range(0, N):
        j = i + l-1
        if j >= N:
            break
        
        DP_ji = 10**9
        for k in range(i, j):
            DP_ji = min(DP_ji
                        ,DP[k][i] + DP[j][k+1] + r[i]*c[k]*c[j])
        DP[j][i] = DP_ji
print(DP[N-1][0])

Python: n = int(input())
p = [0]*(n+1)
for i in range(1,n+1): p[i-1],p[i] = map(int,input().split())
m = [[0]*(n+1) for _ in range(n+1)]
# 対象とする行列の数l
for l in range(2,n+1):
    # for i in range(n+1): print(m[i])    
    # print("/////////////////////////////////")
    # 対象とする行列の範囲i,j
    # iは1からn-(l-1)まで
    for i in range(1,n-l+2):
        j = i+l-1
        m[i][j] = float("inf")
        # (M_iM_i+1...M_k)(M_k+1...M_j)の乗算回数が最小となるkを探す
        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])