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 <cstdio>
#include <algorithm>
using namespace std;
int m[107], dp[107][107];
int main() {
    int n;
    scanf("%d", &n);
    for (int i = 0; i < n; i++) {
    	scanf("%d%d", &m[i], &m[i + 1]);
	}
	for (int l = 2; l <= n; l++) {
		for (int i = 1; i <= n - l + 1; i++) {
			int j = i + l - 1;
			dp[i][j] = 1e9 + 7;
			for (int k = i; k < j; k++) {
				dp[i][j] = min(dp[i][j], dp[i][k] + dp[k + 1][j] + m[i - 1] * m[k] * m[j]);
			}
		}
	}
	printf("%d\n", dp[1][n]);
    return 0;
}

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

struct TMatrix
{
	int Row;
	int Col;
	
	TMatrix(int ARow, int ACol);
};

TMatrix::TMatrix(int ARow, int ACol)
: Row(ARow), Col(ACol)
{
}

class TMinimumMultiplications
{
	std::vector<std::vector<int> > FTable;
	const std::vector<TMatrix>& FMatrixChain;
	
	int GetMinimum(int Begin, int End);
public:
	TMinimumMultiplications(const std::vector<TMatrix>& MatrixChain);
	
	int Get(int Begin, int End);
};

TMinimumMultiplications::TMinimumMultiplications(const std::vector<TMatrix>& MatrixChain)
: FMatrixChain(MatrixChain), FTable(MatrixChain.size(), std::vector<int>(MatrixChain.size(), -1))
{
}

int TMinimumMultiplications::GetMinimum(int Begin, int End)
{
	int Minimum = INT_MAX;
	for(int i = Begin; i < End; ++i){
		int Total = Get(Begin, i)
		          + Get(i + 1, End)
		          + FMatrixChain[Begin].Row * FMatrixChain[i + 1].Row * FMatrixChain[End].Col;
		if(Minimum > Total) Minimum = Total;
	}
	return Minimum;
}

int TMinimumMultiplications::Get(int Begin, int End)
{
	if(Begin == End) return 0;
	if(FTable[Begin][End] < 0){
		FTable[Begin][End] = GetMinimum(Begin, End);
	}
	return FTable[Begin][End];
}

int MinimumMultiplicationCount(const std::vector<TMatrix>& MatrixChain)
{
	TMinimumMultiplications Minimum(MatrixChain);
	return Minimum.Get(0, MatrixChain.size() - 1);
}

int main()
{
	int Count;
	std::cin >> Count;
	std::vector<TMatrix> MatrixChain;
	for(int i = 0; i < Count; ++i){
		int Row, Col;
		std::cin >> Row >> Col;
		MatrixChain.push_back(TMatrix(Row, Col));
	}
	
	std::cout << MinimumMultiplicationCount(MatrixChain) << std::endl;
	return 0;
}

C++: #include "bits/stdc++.h"
#define rep(i,n) for(int i = 0; i < (n); ++i)
using namespace std;
typedef long long int ll;
typedef pair<int, int> P;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
 
const ll INF = 1e18;

int n;
ll R[105], C[105];
ll dp[105][105];

ll dfs(int l, int r){
    if(l == r) return 0;
    if(dp[l][r] != INF) return dp[l][r];
    ll cost = R[l]*C[r];
    ll res = INF;
    for(int k = l; k < r; k++){
        chmin(res, dfs(l,k) + dfs(k+1,r) + cost*C[k]);
    }
    return dp[l][r] = res;
}

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
    cin >> n;
    rep(i,n) cin >> R[i] >> C[i];
    rep(i,n)rep(j,n){
        if(i == j) dp[i][j] = 0;
        else dp[i][j] = INF;
    }
    ll ans = dfs(0, n-1);
    cout << ans << endl;
	return 0;
}

C++: #include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll dp[111][111];
ll R[111],C[111];
int main(){
  int n;

  fill(dp[0],dp[110],1000000000000000000LL);

  cin >> n;
  for(int i=0;i<n;i++)
    cin >> R[i] >> C[i];

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

  for(int k=1;k<n;k++){
    //cout << k << endl;
    for(int i=0;i<n-k;i++){
      for(int j=i;j<i+k;j++){
	///	printf("dp[%d][%d] = %lld + dp[%d][%d] = %lld + %lld * %lld * %lld\n",
	//     i,j,dp[i][j],j+1,i+k,dp[j+1][i+k],R[i],C[i+k],min(C[j],R[j+1]));
	dp[i][i+k] = min( dp[i][i+k],
			  dp[i][j]+dp[j+1][i+k] + 
			  R[i] * C[i+k] * min(C[j],R[j+1]) );
      }
      //  printf("dp[%d][%d] = %lld\n",i,i+k,dp[i][i+k]);
    }
  }

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