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 <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[k+1][j] + p[i-1] * p[k] * p[j]);
			}
		}
	}
	cout << m[1][n] << endl;

	return 0;
}

C++: #include <bits/stdc++.h>
#define _GLIBCXX_DEBUG
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define rrep(i, n) for (int i = 1; i < (n+1); ++i)
using namespace std;
using ll = long long;
const int INF = +100100100;
// typedef pair<int,int> P;

vector<int>P;

int dp(int n){
    vector<vector<int>> D(n,vector<int>(n));
    rep(j,n){
        for(int i = j;i>=0;--i){
            if(i==j)D[i][j]=0;
            else{
                int mini = INF;
                for(int k = i;k<j;++k){
                    int rel = D[i][k]+D[k+1][j]+P[i]*P[k+1]*P[j+1];
                    mini = min(mini,rel);
                }
                D[i][j]=mini;
            }
        }
    }
    return D[0][n-1];
}

int main(){
    int n;
    cin>>n;
    rep(i,n){
        int x,y;cin >> x>>y;
        if(i==0){
            P.push_back(x);
            P.push_back(y);
        }
        else{
            P.push_back(y);
        }
    }
    cout << dp(n) << endl;
    return 0;
}

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

const int INF = INT_MAX/3;
typedef vector<int> vi;
typedef pair<int,int> pii;

int main(){
    int n;cin>>n;
    vector<pii> p(n+1);
    for(int i=0;i<n;i++) cin>>p[i].first>>p[i].second;

    vector<vi> mat(n+1,vi(n+1,INF));    //mat[i][j] : Mi*...*Mj???????°??????°
    for(int i=0;i<n;i++) mat[i][i] = 0;

    for(int sz=2;sz<=n;sz++){
        /*
         * mat[i][j] = min( mat[i][k]+mat[k+1][j]+Mi.first*Mk+1.first*Mk+1.second )
         */
      //  cout << "size = " << sz << endl;
        for(int i=0;i<=n-sz;i++){

            int j = i + sz - 1;

       //     cout << i << " : " << j << endl;

            for(int k=i;k<=j-1;k++){
        //        cout << i << ":" << j << ":" << mat[i][k] << ":" << mat[k+1][j] << endl;
                int tmp = mat[i][k] + mat[k+1][j] + p[i].first * p[k+1].first * p[j].second;
                //cout << tmp << endl;
                mat[i][j] = min(mat[i][j] , mat[i][k] + mat[k+1][j] + p[i].first * p[k+1].first * p[j].second);
            }
        }
    }

    /*
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            cout << mat[i][j] << "\t";
        }
        cout << endl;
    }
    */

    cout << mat[0][n-1] << endl;
}

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

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(18);
  
  int n;
  cin >> n;
  int dp[n+1][n+1];
  rep(i, 1, n+1) dp[i][i] = 0;
  int p[n+1];
  rep(i, 0, n) cin >> p[i] >> p[i+1];
  
  rep(l, 2, n+1) {
    rep(i, 1, n-l+2) {
      int j = i+l-1;
      dp[i][j] = 1000000007;
      rep(k, i, j) {
        dp[i][j] = min(dp[i][j], dp[i][k] + dp[k+1][j] + p[i-1]*p[k]*p[j]);
      }
    }
  }
  
  cout << dp[1][n] << "\n";
}

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[k + 1][j] + p[i - 1] * p[k] * p[j]);
            }
        }
    }
    
    cout << m[1][n] << endl;
    
    return 0;
}

C++: #include <iostream>
#include <vector>
#include <limits>

using namespace std;

// M1, M2, M3, ... , Mn-1, Mn
// M[i,j] = 0 if i = j
// M[i,j] = min { M[i,j] = M[i,k] + M[k+1,j] + p_{i-1} * p_k * p_j } where i <= k < j

int main() {
    int n;
    cin >> n;

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

    int M[n+1][n+1];
    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] = std::numeric_limits<int>::max();
            for (int k = i; k <= j - 1; ++k) {
                int q = M[i][k] + M[k+1][j] + P[i-1] * P[k] * P[j];
                M[i][j] = min(M[i][j], q);
            }
        }
    }
    cout << M[1][n] << endl;

    return 0;
}