Go: package main

import (
	"bufio"
	"fmt"
	"math"
	"os"
	"strconv"
)

type Matrix struct {
	r int // num of row
	c int // num of column
}

type Range struct {
	start int // index, inclusive
	end   int // index, inclusive
}

func (r Range) length() int {
	return r.end - r.start + 1
}

func calcMultiplication(x, y Matrix) (Matrix, int) {
	if x.c != y.r {
		panic("cannnot calculate")
	}
	return Matrix{x.r, y.c}, x.r * y.c * x.c
}

func calcMinMatrixChainMultiplication(matrices []Matrix, r Range, memo map[Range]int) (Matrix, int) {
	if v, ok := memo[r]; ok {
		return Matrix{matrices[r.start].r, matrices[r.end].c}, v
	}
	if r.length() == 0 {
		panic("must not be empty")
	} else if r.length() == 1 {
		return matrices[r.start], 0
	}

	var minCount int = math.MaxInt32

	for i := 0; i < r.length()-1; i++ {
		formerRange := Range{r.start, r.start + i}
		latterRange := Range{r.start + i + 1, r.end}
		matF, countF := calcMinMatrixChainMultiplication(matrices, formerRange, memo)
		matL, countL := calcMinMatrixChainMultiplication(matrices, latterRange, memo)
		_, countFL := calcMultiplication(matF, matL)
		count := countF + countL + countFL
		if count < minCount {
			minCount = count
		}
	}
	memo[r] = minCount
	return Matrix{matrices[r.start].r, matrices[r.end].c}, minCount
}

func main() {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)
	n, _ := nextInt(sc)
	matrices := make([]Matrix, n)
	for i := 0; i < n; i++ {
		r, _ := nextInt(sc)
		c, _ := nextInt(sc)
		matrices[i] = Matrix{r, c}
	}
	memo := make(map[Range]int)
	_, resultCount := calcMinMatrixChainMultiplication(matrices, Range{0, len(matrices) - 1}, memo)
	fmt.Println(resultCount)
}

func nextInt(sc *bufio.Scanner) (int, error) {
	sc.Scan()
	return strconv.Atoi(sc.Text())
}

Python: # -*- coding: utf-8 -*-

import sys
sys.setrecursionlimit(10 ** 9)
def input(): return sys.stdin.readline().strip()
def INT(): return int(input())
def MAP(): return map(int, input().split())
def LIST(): return list(map(int, input().split()))
INF=float('inf')

N=INT()
P=[0]*(N+1)
for i in range(N):
    r,c=MAP()
    if i==0:
        P[i]=r
    P[i+1]=c

dp=[[INF]*(N+1) for i in range(N+1)]
for i in range(N+1):
    dp[i][i]=0

for l in range(2, N+1):
    for i in range(1, N-l+2):
        j=i+l-1
        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[1][N])

Python: def main():
    N = int(input())
    p = []
    for i in range(N):
        r, c = (int(i) for i in input().split())
        p.append(r)
        if i == N - 1:
            p.append(c)
    memo = [[float('inf') for j in range(N + 1)] for i in range(N + 1)]

    def matrix_chain_order():
        for i in range(1,N+1):
            memo[i][i] = 0

        for l in range(2,N+1):
            for i in range(1, N - l + 1 + 1):
                j = i + l - 1
                for k in range(i, j):
                    q = memo[i][k] + memo[k + 1][j] + p[i-1]*p[k]*p[j]
                    if q < memo[i][j]:
                        memo[i][j] = q

    matrix_chain_order()
    print(memo[1][N])

if __name__ == '__main__':
    main()

Python: N = int(input())
m = []
for i in range(N):
  x,y = map(int,input().split())
  m.append((x,y))

dp = [ [0]*N for _ in range(N) ]
for i in range(N):
  dp[i][i] = 0

for L in range(1,N): 
  for i in range(N-L): 
    j = i+L
    dp[i][j] = float('inf')
    for k in range(i,j):
      m0,m1,m2 = m[i],m[k],m[j]
      # print(i,j,k,m0,m1,m2)
      dp[i][j] = min(dp[i][j], dp[i][k]+dp[k+1][j]+m0[0]*m1[1]*m2[1])

print(dp[0][-1])

Python: import sys

# sys.stdin = open('input.txt')

N = 100 + 1

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

n = int(input())

for i in range(1, n+1):
    p[i-1], p[i] = map(int, input().split())
for i in range(1, n+1):
    m[i][i] = 0

for l in range(2, n+1):
    for i in range(1, n-l+1+1):
        j = i + l - 1
        m[i][j] = (1 << 21)
        for k in range(i, j-1+1):
            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])

Python: def main():
    n = int(input())
    m1 = input().split()
    ps = [int(m1[0]), int(m1[1])]
    for _ in range(n - 1):
        ps.append(int(input().split()[1]))
    ms = [[float("inf") for _ in range(n)] for __ in range(n)]
    # 範囲 0 - n
    for i in range(n):
        ms[i][i] = 0

    for length in range(1, n):
        # 00 11 22 33 44 ...         nn
        # 01 12 23 34 45 ...      n-1,n
        # 02 13 24 35 46 ... n-2,n
        # ...
        # 0n
        for start in range(0, n - length):
            end = start + length
            # 仕切りpartition
            m_start_end = float("inf")
            for partition in range(start, end):
                m_start_end = min(m_start_end, ms[start][partition] + ms[partition + 1]
                                  [end] + ps[start] * ps[partition + 1] * ps[end + 1])
            ms[start][end] = m_start_end
    print(ms[0][n - 1])


if __name__ == "__main__":
    main()

Python: 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 l in range(2,n):
 for i in range(1,n-l+1):
  j=i+l-1;m[i][j]=1e6
  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-1])

Python: import sys
INF = float("inf")
n = int(input())
m = [[0] * (n + 1) for _ in range(n + 1)]
li = [list(map(int, a.split())) for a in sys.stdin]
z = (li[0][0], ) + list(zip(*li))[1]
for l in range(1, n):
    for i in range(1, n - l + 1):
        j = i + l
        m[i][j] = INF
        for k in range(i, j):
            m[i][j] = min(m[i][j], m[i][k] + m[k + 1][j] + z[i - 1] * z[k] * z[j])
print(m[1][n])

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

dp = [0 for _ in range(n)]
for i in range(n-1):
    dp[i] = data[i][0] * data[i][1] * data[i+1][1]



def mul(i, j):
    if i == j:
        return 0
    elif i == j - 1:
        return dp[i]
    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])
    return num

print(mul(0, n-1))

Python: INF = 1145141919810364364334

n = int(input())
p = []
for i in range(n):
    a,b = map(int,input().split())
    if i==0:
        p.append(a)
        p.append(b)
    else:
        p.append(b)
    
cost = [[INF] * (n+1) for i in range(n+1)]
for i in range(n+1):
    cost[i][i] = 0
    
for l in range(2,n+1):
    for i in range(1,n-l+2):
        j = i+l-1
        for k in range(i,j):
            cost[i][j] = min(cost[i][j] , cost[i][k] + cost[k+1][j] + p[i-1]*p[k]*p[j])
            
print(cost[1][n])

Python: import sys
from typing import List


if __name__ == "__main__":
    num_matrix = int(input())
    matrices: List[List[int]] = []
    for _ in range(num_matrix):
        matrices.append(list(map(lambda x: int(x), input().split())))
    dp = [[sys.maxsize] * num_matrix for i in range(num_matrix)]
    for i in range(num_matrix):
        dp[i][i] = 0

    for l in range(1, num_matrix):
        for i in range(num_matrix - l):
            row = matrices[i][0]
            col = matrices[i + l][1]
            dp[i][i + l] = min(row * matrices[j][1] * col + dp[i][j] + dp[j + 1][i + l]
                               for j in range(i, i + l))

    print(f"{dp[0][num_matrix - 1]}")

Python: import sys
def calc(i,j):
    if i == j:
        return 0
    elif j-i == 1:
        return A[i][0]*A[i][1]*A[j][1]
    else:
        if d[i][j]:
            return d[i][j]
        else:
            ret = sys.maxsize
            for k in range(i,j):
                tmp = calc(i,k)+calc(k+1,j)+A[i][0]*A[k][1]*A[j][1]
                if tmp < ret:
                    ret = tmp
            d[i][j] = ret
            return ret

n = int(input())
A = []
d = [[None for _ in range(n)] for _ in range(n)]
for i in range(n):
    a,b = [int(i) for i in input().split()]
    A.append((a,b))
print(calc(0,n-1))