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
}

C++: #include<stdio.h>

static const int N = 100;

int min(int a, int b){ return a < b ? a : b; }

int main(){
  int i, j, k, l, v;
  int n, p[N+1], m[N+1][N+1];

  scanf("%d", &n);
  for ( i = 1; i <= n; i++ ){
    scanf("%d %d", &p[i-1], &p[i]);
  }

  for ( i = 1; i <= n; i++ ) m[i][i] = 0;
  for ( l = 2; l <= n; l++ ){
    for ( i = 0; i <= n-l+1; i++ ){
      j = i+l-1;
      m[i][j] = (1<<21);
      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]);
	v = m[i][k] + m[k+1][j] + p[i-1]*p[k]*p[j];
	//	printf("m[%d,%d] + m[%d,%d] + p[%d]p[%d]p[%d] = %d\n", i, k, k+1, j, i-1, k, j, v);
      }
    }
  }

  /*  for ( int i = 1; i <= n; i++ ){
    for ( int j = 1; j <= n; j++ ){
      printf("%6d ", m[i][j]);
    }
    printf("\n");
    }*/

  printf("%d\n", m[1][n]);
  
  return 0;
}

C++: #include <iostream>
using namespace std;
#define INF 1e9
int n;
int row[200], col[200];
int dp[200][200];

int dfs(int l, int r) {
  // row[i],col[i]=row[i+1],col[i+1]
  // row[i]*col[i]*col[i+1]
  if (l == r) return 0;
  if (dp[l][r] != INF) return dp[l][r];
  for (int c = l; c < r; c++) {
    dp[l][r] = min(dp[l][r], dfs(l,c)+dfs(c+1,r)+row[l]*col[c]*col[r]);
  }
  return dp[l][r];
}

int main() {
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> row[i] >> col[i];
  }
  for(int i=0;i<n;i++)
    for(int j=0;j<n;j++)
      dp[i][j]=INF;
  cout << dfs(0, n-1) << endl;
}

C++: #include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
using namespace std;
int n;
int p[101];
const int INF=100000000;
long long dp[101][101];

void f(){
  for(int i=1;i<=n;i++)dp[i][i]=0;
  for(int l=2;l<=n;l++){
    for(int i=1;i<=n-l+1;i++){
      int j=i+l-1;
      dp[i][j]=INF;
      for(int k=i;k<=j-1;k++)dp[i][j]=min(dp[i][j],dp[i][k]+dp[k+1][j]+p[i-1]*p[k]*p[j]);
    }
  }
}
int main(){
  scanf("%d",&n);
  
  for(int i=1;i<=n;i++)scanf("%d %d",&p[i-1],&p[i]);
  f();
  printf("%d\n",dp[1][n]);
  return 0;
}

C++: #include<iostream>
#include<cstdio>
#include<vector>
#include<algorithm>
#include<cstring>
using namespace std;

#define PB push_back
#define MP make_pair

void Input();
void Calc();
void Output();

int N=100;
int dp[100][100]; //100...行列の最大個数
vector<int> ivr;
int n,x;

int main(int argc,char* argv[]){

  memset(dp,15,sizeof(dp));
  for(int i=0;i<=100;i++) dp[1][i]=0;
  ivr.clear();
  
  Input();
  Calc();
  Output();
  return 0;
}

void Input(){
  ivr.PB(0);
  cin>>n;
  for(int i=0;i<2;i++){
    cin>>x;
    ivr.PB(x);
  }
  for(int i=1;i<n;i++){
    cin>>x;
    cin>>x;
    ivr.PB(x);
  }
}

void Calc(){

  for(int i=2;i<=n;i++){
    for(int j=1;j<=n-i+1;j++){
      for(int k=1;k<i;k++){
	dp[i][j]=min(dp[k][j]+dp[i-k][j+k]+ivr[j]*ivr[j+k]*ivr[i+j],dp[i][j]);
      }
    }
  }
}

void Output(){
  cout<<dp[n][1]<<endl;
}

C++: #include <stdio.h>
#include <algorithm>

using namespace std;


int main(){
	int n,minimum,tmp;
	scanf("%d",&n);
	int table[n][n];
	int data[n][2];

	for(int i=0;i<n;i++){
		for(int k=0;k<n;k++)table[i][k] = 0;
		scanf("%d %d",&data[i][0],&data[i][1]);
	}

	for(int i=n-2;i>=0;i--){
		for(int k=0;k<=i;k++){
			if(i==n-2){
				table[n-i-1][k] = data[k][0]*data[k][1]*data[k+1][1];
		}else{
				minimum = 2147483647;
				for(int p=0;p<=n-i-2;p++){
					tmp=(table[p][k]+table[n-i-p-2][k+p+1])+(data[k][0]*data[k+p][1]*data[k+n-i-1][1]);
					minimum = min(minimum,tmp);
				}
				table[n-i-1][k] = minimum;
			}
		}
	}

	printf("%d\n",table[n-1][0]);

    return 0;
}