Go: package main

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

//util
var sc = bufio.NewScanner(os.Stdin)

func nextStr() string {
	sc.Scan()
	return sc.Text()
}

func nextInt() int {
	sc.Scan()
	i, e := strconv.Atoi(sc.Text())
	if e != nil {
		panic(e)
	}
	return i
}

func printList(list []int) {
	buf := bufio.NewWriter(os.Stdout)
	for _, v := range list {
		buf.Write([]byte(fmt.Sprintf(" %d", v)))
	}
	buf.Write([]byte("\n"))
	buf.Flush()
}

//solve
//単純な場合
func matrixChainMultiplication() {
	//行列が1つだけのとき
	for i := 1; i <= n; i++ {
		m[i][i] = 0
	}
	for l := 2; l <= n; l++ {
		for i := 1; i <= n-l+1; i++ {
			j := i + l - 1
			m[i][j] = 1 << 21
			//kまでで区切る
			for k := i; k <= j-1; k++ {
				m[i][j] = min(m[i][j], m[i][k]+m[k+1][j]+p[i-1]*p[k]*p[j])
			}
		}
	}
}

func max(a, b int) int {
	if a > b {
		return a
	} else {
		return b
	}
}

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

const MAX = 100

var n int
var p [MAX + 1]int

//m[i][j]: Mi * Mi+1 * ... * Mjを計算するときに必要なスカラー乗算の最小回数
var m [MAX + 1][MAX + 1]int

func main() {
	sc.Split(bufio.ScanWords)
	n = nextInt()
	for i := 1; i <= n; i++ {

		p[i-1] = nextInt() //行数
		p[i] = nextInt()   //列数
	}

	matrixChainMultiplication()
	fmt.Println(m[1][n])
}

Python: def least_multiplication(mtx):
    N = len(mtx)
    mul = [[None] * N for x in range(N)]

    for i in range(N):
        mul[i][i] = 0
    #pprint.pprint(mul)

    for chain in range(1, N):
        for begin in range(N-chain):
            end = begin + chain
            cand = []
            for j in range(begin, end):
                left = mul[begin][j]
                down = mul[j+1][end]
                this = mtx[begin][0] * mtx[j][1] * mtx[end][1]
                cand.append(left + down + this)
            mul[begin][begin+chain] = min(cand)
        #pprint.pprint(mul)
    return mul[0][N-1]


def main():
    n = int(input())
    matrices = []
    for i in range(n):
        col, row = map(int, input().split())
        matrices .append((col, row))
    ans = least_multiplication(matrices)
    print(ans)


main()

Python: import sys

sys.setrecursionlimit(10**7)

inf = float('inf')

def solve():
    n = int(sys.stdin.readline())

    r = [0] * n
    c = [0] * n

    for i in range(n):
        ri, ci = map(int, sys.stdin.readline().split())
        r[i] = ri
        c[i] = ci

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

    for ls in range(2, n + 1):
        for i in range(n - ls + 1):
            dp[i][i + ls] = inf
            for j in range(i + 1, i + ls):
                dp[i][i + ls] = min(dp[i][i + ls], dp[i][j] + dp[j][i + ls] + r[i]*r[j]*c[i + ls - 1])

    ans = dp[0][n]

    print(ans)

if __name__ == '__main__':
    solve()

Python: def solve(n,mat):
    dp=[[0]*n for _ in range(n)]
    for kukan in range(1,n):
        for i in range(n-kukan):
            dp[i][i+kukan]=min([dp[i][mid]+dp[mid+1][i+kukan]+mat[i][0]*mat[mid+1][0]*mat[i+kukan][1] for mid in range(i,i+kukan)])
    return dp[0][n-1]

n=int(input())
mat=[tuple(map(int,input().split())) for _ in range(n)]
print(solve(n,mat))

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

n = int(input())
p = []
m = dict()
for _ in range(n):
    r, c = map(int, input().split())
    p.append(r)
    if _ == n-1:
        p.append(c)

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

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

print(m[(1, n)])

Python: N = int(input())
RC = [tuple(map(int, input().split())) for _ in range(N)]
INF = 10**18
# dp[i][j]: iからjの区間における最小回数
dp = [[INF]*N for _ in range(N)]
for i in range(N):
    for j in range(N):
        if i == j:
            dp[i][j] = 0
for diff in range(2, N+1):
    for i in range(N-diff+1):
        j = i+diff-1
        for k in range(i, j):
            dp[i][j] = min(dp[i][j], dp[i][k]+dp[k+1][j]+RC[i][0]*RC[k][1]*RC[j][1])
print(dp[0][N-1])

Python: import sys
input = sys.stdin.readline
a = []
dp = []

#l <= x < rまでの行列せきの最小値
def rec(l, r):
	if dp[l][r] != -1:
		return dp[l][r]
	if l+1 == r:
		dp[l][r] = 0
		return dp[l][r]
	if l+2 == r:
		dp[l][r] = a[l][0] * a[l][1] * a[l+1][1]
		return dp[l][r]

	m = 100000000
	for i in range(l+1, r):
		m = min(m, rec(l, i) + rec(i, r) + a[l][0] * a[i][0] * a[r-1][1])
	dp[l][r] = m
	return dp[l][r]

def main():
	global a, dp
	n = int(input().strip())
	for i in range(n):
		a.append(tuple(map(int, input().strip().split())))
	dp = [[-1] * (n+1) for _ in range(n)]
	print(rec(0, n))

if __name__ == '__main__':
	main()

Python: import sys


class Mat(object):

  def __init__(self, row, col):
    self.row = row
    self.col = col
    
def get_min_mult_cnt_dp(i, j, mat_list):

  multp = [[sys.maxsize for i in range(len(mat_list))] for i in range(len(mat_list))]

  

  # 長さ0連鎖の演算量
  for i in range(len(mat_list)):
    multp[i][i] = 0

  for le in range(1, len(mat_list)):
    for i in range(len(mat_list)-le):
      j = i + le

      tmp = sys.maxsize
      for k in range(i, j):
        p = mat_list[i].row
        n = mat_list[k].col
        q = mat_list[j].col
        tmp = multp[i][k] + multp[k+1][j] + p*n*q

        if (tmp < multp[i][j]):
          multp[i][j] = tmp
    
  
  return multp[i][j]
mat_list = []
num = int(input())
for i in range(num):
    a,b = map(int,input().split())
    mat_list.append(Mat(a,b))



print(int(get_min_mult_cnt_dp(0, num-1, mat_list)))

Python: import sys
read = sys.stdin.read
readline = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 8)
INF = float('inf')
MOD = 10 ** 9 + 7

def matrixChainMultiplication(n,p):
    dp = [[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
            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])
    return dp[1][n]


def main():
    N = int(readline())
    P = []

    for _ in range(N):
        r, c = map(int, readline().split())
        P.append(r)
    P.append(c)

    print(matrixChainMultiplication(N,P))

    


if __name__ == '__main__':
    main()

Python: if __name__ == '__main__':
    from sys import stdin
    input = stdin.readline

    N = 100
    p = [0]*(N+1)
    m = [[0]*(N+1) for _ in range(N+1)]

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

    for l in range(2, n+1):
        for i in range(1, n-l+2):
            j = i + l - 1
            m[i][j] = 2**21 # 十分大きい数
            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])

Python: import sys

def get_min_cost(n, p):
	m = [[0 for x in range(n+1)] for x in range(n+1)]
	for s in range(n):
		i = 1
		for j in range(s+2, n):
			m[i][j] = sys.maxsize
			for k in range(i, j+1):
				m[i][j] = min(m[i][j], m[i][k]+m[k+1][j]+p[i-1]*p[k]*p[j])
			i+=1	
	return m[1][n]

n = int(input())
p = [0] * (n+1)
j = 0
for i in range(n):
	a = list(map(int, input().split()))
	if i == 0:
		p[j] = a[0]
		j += 1
	p[j] = a[1]
	j += 1
print(get_min_cost(n, p))

Python: n = int(input())

M = []
for i in range(n):
    r, c = map(int, input().split())
    if i == 0: M.append(r)
    M.append(c)

dp = [[float("inf")] * (n+1) for _ in range(n+1)]

for i in range(1,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] + M[i-1]*M[k]*M[j])

print(dp[1][n])