stack c++
stack<int> stk;
stk.push(5);
int ans = stk.top(5); // ans =5
stk.pop();//removes 5stack c++
stack<int> stk;
stk.push(5);
int ans = stk.top(5); // ans =5
stk.pop();//removes 5stack implementation c++
#include <iostream>
using namespace std;
int stack[100], n=100, top=-1;
void push(int val) {
if(top>=n-1)
cout<<"Stack Overflow"<<endl;
else {
top++;
stack[top]=val;
}
}
void pop() {
if(top<=-1)
cout<<"Stack Underflow"<<endl;
else {
cout<<"The popped element is "<< stack[top] <<endl;
top--;
}
}
void display() {
if(top>=0) {
cout<<"Stack elements are:";
for(int i=top; i>=0; i--)
cout<<stack[i]<<" ";
cout<<endl;
} else
cout<<"Stack is empty";
}
int main() {
int ch, val;
cout<<"1) Push in stack"<<endl;
cout<<"2) Pop from stack"<<endl;
cout<<"3) Display stack"<<endl;
cout<<"4) Exit"<<endl;
do {
cout<<"Enter choice: "<<endl;
cin>>ch;
switch(ch) {
case 1: {
cout<<"Enter value to be pushed:"<<endl;
cin>>val;
push(val);
break;
}
case 2: {
pop();
break;
}
case 3: {
display();
break;
}
case 4: {
cout<<"Exit"<<endl;
break;
}
default: {
cout<<"Invalid Choice"<<endl;
}
}
}while(ch!=4);
return 0;
}stack c++
/* Stack is a data structure that provides two O(1) time operations:
adding an element to the top and removing an element from the top.
It is only possible to access the top element of a stack. */
stack<int> s;
s.push(3);
s.push(2);
s.push(5);
cout << s.top(); // 5
s.pop();
cout << s.top(); // 2cpp stack
// Fast DIY Stack
template<class S, const int N> class Stack {
private:
S arr[N];
int top_i;
public:
Stack() : arr(), top_i(-1) {}
void push (S n) {
arr[++top_i] = n;
}
void pop() {
top_i--;
}
S top() {
return arr[top_i];
}
S bottom() {
return arr[0];
}
int size() {
return top_i+1;
}
};stack c++
#include <bits/stdc++.h>
stack<int> stk;
stk.push(5);
int ans = stk.top(5); // ans =5
stk.pop();//removes 5stack in c++
#take input 2D vector
vector<vector<int> > v;
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
v[i].push_back(data);
}}Copyright © 2021 Codeinu
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