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])
}

C++: #include<algorithm>
#include<iostream>
#include<cstdlib>
#include<cstring>
#include<cstdio>
#include<vector>
#include<queue>
#include<stack>
#include<cmath>
#include<list>
#include<map>
#include<set>
using namespace std;

typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<string> VS;
typedef pair<int,int> PII;
typedef long long LL;

#define d(x)  cout<<#x<<" = "<<(x)<<endl;
#define ALL(a)  (a).begin(),(a).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define PB push_back
#define MP make_pair
#define SZ(a) int((a).size())
#define EACH(i,c) for(typeof((c).begin()) i=(c).begin(); i!=(c).end(); ++i)
#define REACH(i,c) for(typeof((c).rbegin()) i=(c).rbegin(); i!=(c).rend(); ++i)
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define SORT(c,n) sort(c,c+n)
#define VSORT(c) sort((c).begin(),(c).end())
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)
#define DFOR(i,b,a) for(int i=(b)-1;i>=(a);--i)
#define DREP(i,n) DFOR(i,n,0)
#define INF 2000000000

const double EPS = 1e-10;
const double PI  = acos(-1.0);
////////////////////////////////////////////////
int main(){return 0;}

C++: #include<bits/stdc++.h>
using namespace std;
const long long INF = 1e7 + 1;
const long long MOD = 1000000007;
const long double PI = 3.1415926;
#define FOR(i,r,n) for(ll i = (ll)(r); i < (ll)(n); i++)
#define RFOR(i,r,n) for(ll i=(ll)(n-1);i>=r;i--)
#define REP(i,n) FOR(i,0,n)
#define RREP(i,n) RFOR(i,0,n)
#define ALL(x) x.begin(),x.end()
#define RALL(x) x.rbegin(),x.rend()
typedef long long int ll;
typedef vector<ll> vi;
typedef vector < pair<ll, ll > > vp;
typedef vector <string> vs;
typedef vector <char> vc;
typedef list <ll> lst;

ll n, m, k, ans = 0, sum = 0, cnt = 0;
string s;
char c;

/*--------------------template--------------------*/

typedef pair<int, int> pii;

ll DP[105][105];
ll p[105];

ll f(ll r, ll c)
{
	ll mi = INF;
	REP(i, c - r)
	{
		mi = min(mi, DP[r][r + i] + DP[r + i + 1][c] + p[r - 1] * p[r + i] * p[c]);
	}
	return mi;
}

int main()
{
	cin >> n;
	REP(i, n+1)
	{
		DP[i][i] = 0;
	}
	cin >> p[0] >> p[1];
	REP(i, n - 1)
	{
		cin >> k >> p[i+2];
	}
	REP(i, n - 1)
	{
		DP[i + 1][i + 2] = p[i] * p[i + 1] * p[i + 2];
	}
	REP(i, n - 2)
	{
		//REP(j, 3 + i, n + 1)
		for(int j=3+i;j<=n;j++)
		{
			DP[j - 2 - i][j] = f(j - 2 - i,j);
		}
	}
	
	cout << DP[1][n] << 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 <vector>
#include <algorithm>
#include <queue>
#include <map>
#include <set>
#include <cmath>
#include <cstdio>
#include <cstring>
using namespace std;
typedef long long int ll;
#define rep(i, a, n) for (ll i = a; i < (ll)(n); i++)
long long GCD(long long a, long long b) { return b ? GCD(b, a%b) : a; }
long long LCM(long long a, long long b)  {return a/GCD(a,b)*b;}

int main()
{
    int n;
    int p[101];
    int 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 c=1;c<n;c++)
        for(int i=1;i<=n-c;i++)
        {
            int j=i+c;
            m[i][j]=99999999;
            for(int k=i;k<j;k++)
            {
                m[i][j]=std::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 <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>
using namespace std;

#define N 100

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

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

  // 初期値
  for (i = 1; i <= n; i++) cost[i][i] = 0;

  for (l = 2; l <= n; l++) {  // 行列の個数
    for (i = 1; i <= n - l + 1; i++) {
      j = i + l - 1;
      for (k = i; k < j; k++) {
        if (k == i) min_cost = cost[i][k] + cost[k+1][j] + p[i-1] * p[k] * p[j];
        else min_cost = min(min_cost, cost[i][k] + cost[k+1][j] + p[i-1] * p[k] * p[j]);
      }
      cost[i][j] = min_cost;
    }
  }

  cout << cost[1][n] << endl;

  return 0;
}

C++: #include "stdafx.h"
#include<iostream>
#include<vector>
using namespace std;

vector<vector<int> > cost,best;
vector<int> A;

void compute(int s,int e){
	int minc = 0;
	int mink = -1;
	for(int k=s+1;k<=e;++k){
		if (cost[s][k-1] < 0){
			compute(s,k-1);
		}
		if (cost[k][e] < 0) {
			compute(k,e);
		}
		int c = cost[s][k-1] + A[s]*A[k]*A[e+1] + cost[k][e];
		if (mink < 0 || c < minc) {
			minc = c;
			mink = k;
		}
	}
	cost[s][e] = minc;
	best[s][e] = mink;
}

int main(){
	int n;
	cin >> n;
	A.resize(n+1);
	for(int i=0;i<n;++i) {
		int r,c;
		cin >> r >> c;
		if (i==0){
			A[0] = r;
		}
		if (A[i] != r){ cout << "error";exit(0);}
		A[i+1] = c;
	}
	cost.resize(n);
	best.resize(n);
	for(int i=0;i<n;++i){
		cost[i].resize(n);
		best[i].resize(n);
		for(unsigned j=0;j<cost[i].size();++j){
			cost[i][j] = -1;
			best[i][j] = -1;
		}
		cost[i][i]=0;
		best[i][i]=i;
	}
	compute(0,n-1);
	cout << cost[0][n-1] << std::endl;
}

C++: //Matrix Chain Multiplication
#include <iostream>
#include <climits>

using namespace std;

int matrixChainMultiplication(int p[], int n) {
    int dp[n+1][n+1];
    for(int i = 0; i < n + 1; i++) dp[i][i] = 0;
    for(int l=2; l<n+1; l++) {
        for(int i=1; i<n-l+2; i++) {
            int j = i+l-1;
            dp[i][j] = INT_MAX;
            for(int k=i+1; k<j+1; k++) {
                dp[i][j] = min(dp[i][j], dp[i][k-1] + dp[k][j] + p[i - 1] * p[k - 1] * p[j]);
            }
        }
    }
    return dp[1][n];
}

int main() {
    int n, r, c;
    cin >> n;
    int p[n+1];
    for(int i=0; i<n; i++) {
        cin >> r >>  c;
        if(i == 0) p[0] = r;
        p[i+1] = c;
    }

    cout << matrixChainMultiplication(p, n) << endl;
}