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TCS NQT Previous Year Coding Questions — Practice, Learn, and Run Instantly

Explore real TCS NQT coding problems with slot-wise tags and clean solutions with Python, C++ and Java. Then jump into an AI‑powered online compiler for instant execution, error fixes, and optimization tips. No sign‑up required to preview samples; continue to CodeVault to unlock the full set with the share code TCS123.

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// Example: Smallest Missing Positive
// 2023 - September Day 1 - Slot 1
int firstMissingPositive(vector<int>& a){
  int n=a.size();
  for(int i=0;i<n;i++){
    while(a[i]>0 && a[i]<=n && a[a[i]-1]!=a[i])
      swap(a[i], a[a[i]-1]);
  }
  for(int i=0;i<n;i++) if(a[i]!=i+1) return i+1;
  return n+1;
}
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Focus: Coding Section

Curated questions from recent TCS NQT slots with constraints, edge cases, testable I/O and with solutions in Python, C++ and Java.

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Sample TCS NQT Coding Questions

2023 • September • Day 1 • Slot 1

Problem: Make Array Beautiful

Given an array, perform minimum operations to make adjacent elements alternate in sign. 

Input:
5
-1 3 -2 4 5

Output:
1

Explanation:
Change last 5 → -5.
2023 • September • Day 2 • Slot 2

Problem: Minimum Swaps to Group Ones

Count minimum swaps to group all 1s together in a binary array. 

Input:
7
1 0 1 0 1 0 0

Output:
1
2022 • October • Day 1 • Slot 1

Problem: Balanced Brackets with Wildcards

'?' can become '(' or ')'. Determine if a valid sequence is possible. 

Input:
(?))??

Output:
YES

TCS NQT Pattern (Quick View)

Aptitude

Quantitative basics and problem solving.

Verbal

Reading comprehension and grammar fundamentals.

Reasoning

Logical and analytical thinking questions.

Coding (Most Impact)

Highest weight for developer roles—practice here and run instantly with AI help.

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