Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

// I/O
type Scanner struct {
	sc *bufio.Scanner
}

func NewScanner() *Scanner {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)
	sc.Buffer(make([]byte, 1024), int(1e+9))
	return &Scanner{sc}
}

func (s *Scanner) nextStr() string {
	s.sc.Scan()
	return s.sc.Text()
}

func (s *Scanner) nextInt() int {
	i, e := strconv.Atoi(s.nextStr())
	if e != nil {
		panic(e)
	}
	return i
}

func (s *Scanner) nextFloat() float64 {
	f, e := strconv.ParseFloat(s.nextStr(), 64)
	if e != nil {
		panic(e)
	}
	return f
}

func (s *Scanner) nextRuneSlice() []rune {
	return []rune(s.nextStr())
}

func (s *Scanner) nextIntSlice(n int) []int {
	res := make([]int, n)
	for i := 0; i < n; i++ {
		res[i] = s.nextInt()
	}
	return res
}

func (s *Scanner) nextFloatSlice(n int) []float64 {
	res := make([]float64, n)
	for i := 0; i < n; i++ {
		res[i] = s.nextFloat()
	}
	return res
}

// Arithmetic
func max(nums ...int) int {
	m := nums[0]
	for _, i := range nums {
		if m < i {
			m = i
		}
	}
	return m
}

func min(nums ...int) int {
	m := nums[0]
	for _, i := range nums {
		if m > i {
			m = i
		}
	}
	return m
}

func abs(x int) int {
	if x > 0 {
		return x
	}
	return -x
}

func pow(x, y int) int {
	res := 1
	for i := 0; i < y; i++ {
		res *= x
	}
	return res
}

func ceil(a, b int) int {
	if a%b == 0 {
		return a / b
	} else {
		return a/b + 1
	}
}

// Sort
type RuneSlice []rune

func (a RuneSlice) Len() int           { return len(a) }
func (a RuneSlice) Less(i, j int) bool { return a[i] < a[j] }
func (a RuneSlice) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }

// Main
func main() {
	sc := NewScanner()
	wtr := bufio.NewWriter(os.Stdout)
	N := sc.nextInt()
	p := make([]int, N+1)
	dp := make([][]int, N+1)
	for i, _ := range dp {
		dp[i] = make([]int, N+1)
	}
	for i := 0; i < N; i++ {
		p[i] = sc.nextInt()
		p[i+1] = sc.nextInt()
	}
	for i := 1; i <= N; i++ {
		dp[i][i] = 0
	}
	for l := 2; l <= N; l++ {
		for i := 1; i <= N-l+1; i++ {
			j := i + l - 1
			dp[i][j] = 1 << 60
			for 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])
			}
		}
	}

	fmt.Fprintln(wtr, dp[1][N])
	wtr.Flush()
}

C++: #include<iostream>
#include<vector>
#define NIL -1
using namespace std;

struct M{
    int r;
    int c;
};

int calc(int s, int e, const vector<M>& M_set,
         vector<vector<int> >& MEMO) {
    if (s == e) return MEMO[s][e] = 0;
    if (MEMO[s][e] != NIL) return MEMO[s][e];
    int min = 1e9;
    for (int split = s; split < e; split++) {
        int val = calc(s, split, M_set, MEMO)
                  + calc(split + 1, e,M_set, MEMO)
                  + M_set[s].r * M_set[split].c * M_set[e].c;
        if (min > val) min = val;
    }
    return MEMO[s][e] = min;
}

int main(){
    int n;
    cin >> n;
    vector<vector<int> > MEMO(n, vector<int>(n, NIL));
    vector<M> M_set(n);
    for (int i = 0; i < n; i++) {
        cin >> M_set[i].r >> M_set[i].c;
    }
    cout << calc(0, n - 1, M_set, MEMO) << endl;
    return 0;
}

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


int main(void){
  int i, j, k, l;
  int n, mat[100+1][100+1], len[100+1];

  scanf("%d", &n);
  
  for(int i=1; i<=n; i++){
    scanf("%d %d", &len[i-1], &len[i]);
  }
  
  for(l=2; l<=n; l++){
    for(i=1; i<=n-l+1; i++){
      j=i+l-1;
      mat[i][j]=INT_MAX;

      for(k=i; k<=j-1; k++){
	mat[i][j]=min(mat[i][j], mat[i][k]+mat[k+1][j]+len[i-1]*len[k]*len[j]);
      }
    }
  }

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

C++: #include <bits/stdc++.h>

using namespace std;

#define Vi vector<int>
#define FOR(i,s,e) for (int i=s; i<e; i++)
#define ITER(v) v.begin(), v.end()

constexpr int N_MAX = 100;

int n;
int shape[N_MAX][2];
int dp[N_MAX][N_MAX];

int mcm() {
    FOR(d,0,n) {
        FOR(from,0,n-d) {
            int to = from + d;
            if (from == to) {
                dp[from][to] = 0;
            } else {
                int minval = -1;
                FOR(s,0,d) {
                    int cand = dp[from][from+s] + dp[from+s+1][to]
                        + shape[from][0] * shape[from+s][1] * shape[to][1];
                    if (minval == -1) {
                        minval = cand;
                    } else {
                        minval = min(cand, minval);
                    }
                }
                dp[from][to] = minval;
            }
        }
    }
    return dp[0][n-1];
}

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);

    cin >> n;
    FOR(i,0,n) {
        cin >> shape[i][0] >> shape[i][1];
    }
    cout << mcm() << endl;

    return 0;
}

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

int CountMulti(const int& r1,const int& c1,const int& r2,const int& c2){
	return c1*c2*r1;
}

int main(void){
	int N;
	cin >> N;
	vector<long long> rows(N),cols(N);
	for(int i=0;i<N;i++)
		cin >> rows[i] >> cols[i];

	const long long INF = 1e18;
	long long dp[101][101];
	memset(dp,0,sizeof(dp));
	for(int i=0;i<N;i++){
		for(int j=0;j<N;j++){
			if(i == j)dp[i][j] = 0;
			else dp[i][j] = INF;
		}
	}
	for(int i=0;i<N-1;i++){
		dp[i][i+1] = rows[i]*rows[i+1]*cols[i+1];
	}

	for(int d=2;d<N;d++){
		for(int l=0;l<N-d;l++){
			for(int r=l;r<l+d;r++){
				dp[l][l+d] = min(dp[l][l+d], dp[l][r] + dp[r+1][l+d] + rows[l]*rows[r+1]*cols[l+d]);
			}
		}
	}
	cout << dp[0][N-1] << endl;
	return 0;
}

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

using P = pair<int, int>;

int nmul(int x, int y, int z){
    return x*y*z;
}

int main(){
    int n; cin >> n;
    vector<int> M(n+1);
    int dummy;
    for(int i=0; i<n; ++i){
        cin >> M[i] >> dummy;
    }
    M[n] = dummy;
    vector<vector<int>> dp(n+1, vector<int>(n+1, numeric_limits<int>::max()));
    // dp[i][i+l] = M_i から M_{i+l} までの行列乗算の最適コスト
    for(int l=0; l<n; ++l) dp[l][l] = 0;

    for(int L=1; L<n; ++L){
        for(int l=0; l<n-L; ++l){
            for(int k=0; k<L; ++k){
                dp[l][l+L] = min(dp[l][l+L], dp[l][l+k] + dp[l+k+1][l+L] + nmul(M[l],M[l+k+1],M[l+L+1]));
            }
        }
    }
    cout << dp[0][n-1] << endl;
}

C++: #include<iostream>
#include<cmath>
#include<algorithm>
#include<string>
#include<vector>
#include<stack>
#include<queue>
#include<set>
#include<map>
#include<iomanip>
#include<bitset>
using namespace std;
typedef long long ll;
typedef pair<ll,ll> P;
typedef pair<ll,P> P1;
typedef pair<P,P> P2;
#define pu push
#define pb push_back
#define mp make_pair
#define eps 1e-7
#define INF 1000000000
#define fi first
#define sc second
#define rep(i,x) for(ll i=0;i<x;i++)
#define repn(i,x) for(ll i=1;i<=x;i++)
#define SORT(x) sort(x.begin(),x.end())
#define ERASE(x) x.erase(unique(x.begin(),x.end()),x.end())
#define POSL(x,v) (lower_bound(x.begin(),x.end(),v)-x.begin())
#define POSU(x,v) (upper_bound(x.begin(),x.end(),v)-x.begin())

const int MAX = 510000;
const int MOD = 1000000007;

ll dp[210][210];
// dp[i][j] は from i to jまで　の積の計算の最小回数

int main(){
  ll N; cin >> N;
  vector<P> a(N); rep(i,N) cin >> a[i].fi >> a[i].sc;

  // dp 初期化
  rep(i,N) rep(j,N) dp[i][j] = INF;
  rep(i,N) dp[i][i] = 0;

  repn(i,N){
    // iはいくつ離れてるか
    rep(j,N){
      // j is start
      for(ll k = j; k <= i + j; k++){
        // k が空いてた
        if(k == j){
          dp[j][j + i] = min(dp[j][j + i] , a[k].fi * a[k].sc * a[j + i].sc  + dp[j + 1][j + i]);
        }
        else if(k == i + j){
          dp[j][j + i] = min(dp[j][j + i] , dp[j][j + i - 1] + a[j].fi * a[k].fi * a[k].sc);
        }
        else{
          dp[j][j + i] = min(dp[j][j + i] ,
            dp[j][k] + a[j].fi * a[k].sc * a[j + i].sc + dp[k + 1][j + i]);
        }
      }
    }
  }

  // rep(i,N) rep(j,N) cout << i << " " << j << " " << dp[i][j] << endl;

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