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>
#include <stdlib.h>
#define N 100

int order(int, int *);

int main(){

  int i;
  int n, p[N + 1];

  scanf("%d", &n);

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

  //for(i = 0; i <= n; i++) printf("%d\n", p[i]);

  printf("%d\n", order(n, p));

  return 0;
}

int order(int n, int *p){

  int i, j, k;
  int t, q, m;
  int a[N][N];

  for(i = 1; i <= n; i++){
    a[i][i] = 0;
  }

  for(i = 2; i <= n; i++){
    for(j = 1; j <= n - i + 1; j++){
      t = i + j - 1;
      a[j][t] = 114514;
      for(k = j; k < t; k++){
	q = a[j][k] + a[k + 1][t] + p[j - 1] * p[k] * p[t];
	if(j == k) m = q;
	  else if(m > q) m = q;
      }
      a[j][t] = m;
    }
  }
  
  return a[1][n]; 
}

C++: #include <stdio.h>
#include <iostream>
#include <string>
using namespace std;
#define NUM 100
#define INF 1000000000

int X_dim[NUM];
int Y_dim[NUM];
int M[NUM][NUM];

void init(){
    for(int i = 0; i < NUM; i++){
        for(int j = 0; j < NUM; j++){
            if(i == j){
                M[i][j] = 0;
            }else{
                M[i][j] = INF;
            }
        }
    }

}

int main(void){
    init();

    int n;
    scanf("%d", &n);

    for(int i = 0; i < n; i++){
        scanf("%d %d", &X_dim[i], &Y_dim[i]);
    }

    for(int k = 1; k <= n - 1; k++){
        for(int x = 0; x + k <= n - 1; x++){
            for(int t = x; t <= x + k - 1; t++){
                M[x][x + k] = min(M[x][x + k], M[x][t] + M[t + 1][x + k] + X_dim[x] * Y_dim[t] * Y_dim[x + k]);
                // printf("M[%d][%d]: M[%d][%d] + M[%d][%d] + %d * %d * %d\n", x, x + k, x,t,t+1,x+k,X_dim[x],Y_dim[t],Y_dim[x+k]);
            }
        }
    }

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

C++: #include <bits/stdc++.h>
#define rep(i, n) for(int i = 0; i < n; i++)
using namespace std;
typedef long long ll;

int dp[100][100];

int main(void)
{   
    int n;
    cin >> n;
    pair<int, int> rc[n];
    rep(i, n) cin >> rc[i].first >> rc[i].second;

    vector<vector<int> > dp(n, vector<int>(n, 1e9));
    
    rep(i, n) {
        dp[i][i] = 0;
    }

    for(int i = 1; i <= n-1; i++) {
        for(int j = 0; j <= n - 1 - i; j++) {
            for(int k = j; k < j + i; k++) {
                dp[j][j+i] = min(dp[j][j+i], dp[j][k] + dp[k+1][j+i] + rc[j].first*rc[k].second*rc[j+i].second);
            }
        }
    }

    cout << dp[0][n-1] << endl;
    return 0;
}

C++: #include "bits/stdc++.h"
using namespace std;

static const int N = 100;

int main(){
	int n,p[N+1],m[N+1][N+1];
	cin>>n;
	for (int i = 1; i <= n; ++i) {
		cin>>p[i-1]>>p[i];
	}
	for (int i = 1; i <= n; ++i) {m[i][i]=0;}

	for (int l = 2; l <= n; ++l) {

		for (int i = 1; i <= n-l+1; ++i) {
			int j=i+l-1;
			m[i][j]=(1<<21);
			for (int 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]);
			}
		}
	}
	cout<<m[1][n]<<endl;
	return 0;
}

C++: #include <iostream>
#include <cstdio>
#include <algorithm>
#include <vector>
#include <utility>
#include <queue>
#include <climits>
using namespace std;

int mcm(vector<int>& p)
{
    vector<vector<int> > m(p.size() - 1, vector<int>(p.size() - 1));
    for (int i = 0; i < m.size(); i++) {
        m[i][i] = 0;
    }
/*
 * l == number of targets
 * i == left most of targets
 */
    for (int l = 2; l <= m.size(); l++) {
        for (int i = 0; i < m.size() - l + 1; i++) {
            int j = i + l - 1;
            m[i][j] = INT_MAX;
            for (int k = i; k < j; k++) {
                m[i][j] =
                    min(m[i][j],
                        m[i][k] + m[k + 1][j] + p[i] * p[k + 1] * p[j + 1]);
            }
        }
    }
    return m[0][m.size() - 1];
}

int main()
{
    int n;
    cin >> n;
    vector<int> p(n + 1);
    for (int i = 1; i < n + 1; i++) {
        cin >> p.at(i - 1) >> p.at(i);
    }
    cout << mcm(p) << endl;
    return 0;
}

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

static const int N = 100;

int main(){
int n,p[N+1],m[N+1][N+1];
cin >> n;

for(int i=1;i<=n;i++){
cin >> p[i-1] >> p[i];
}

for(int i=1;i<=n;i++) m[i][i]=0;
for(int l=2;l<=n;l++){
for(int i=1;i<=n-l+1;i++){
int j=i+l-1;
m[i][j]=(1<<21);
for(int k = i;k<=j-1;k++){
m[i][j]=min(m[i][j],m[i][k]+m[i][k]+m[k+1][j]+p[i-1]*p[k]*p[j]);
}
}
}
cout << m[1][n]<< endl;

return 0;

}

C++: #include <iostream>
#include <algorithm>
#include <cstdio>
#include <cmath>
#include <string>
#include <cctype>
#include <stack>
#include <queue>
#include <vector>
#include <cstdlib>
#include <list>
#define _USE_MATH_DEFINES
#include <math.h>

using namespace std;

int main() {

	int n, p[101], m[101][101];

	cin >> n;
	for (int i = 1; i < n; i++) {
		cin >> p[i - 1] >> p[i];
	}

	for (int i = 1; i <= n; i++)m[i][i] = 0;

	for (int i = 2; i <= n; i++) {
		for (int j = 1; j <= n; j++) {
			int k = i + j - 1;
			m[j][k] = (1 << 21);
			for (int l = j; l <= k - 1; l++) {
				m[j][k] = min(m[j][k], m[j][l] + m[l + 1][k] + p[j - 1] * p[l] * p[k]);
			}
		}
	}

	return 0;
}