Can anyone help me why my code is giving runtime error on cf but works fine on my local machine? Code: https://codeforces.net/contest/1215/submission/89127974 Problem: https://codeforces.net/contest/1215/problem/C Will codeforces compiler give an error if a vector is empty and size function is called on the vector ?
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Время на сервере: 23.12.2024 03:01:14 (i1).
Десктопная версия, переключиться на мобильную.
При поддержке
for (ll i = 0; i < inda.size() - 1; i += 2) {vector.size() is unsigned type, for empty vector this loop runs until using i as an index causes runtime error.
Better use
for (ll i = 0; i+1 < inda.size(); i += 2) {I assume that testcase would not work on you machine, too.
Can you elaborate on this?
How this
for (ll i = 0; i+1 < inda.size(); i += 2) {will work but not thisfor (ll i = 0; i < inda.size() - 1; i += 2) {size()returns an unsigned integer. Unsigned integers can't be negative. If you do an operation on an unsigned integer that results in a negative value, it wraps around to a positive value. Also, when you do an operation involving signed and unsigned integers, the signed operand is converted to an unsigned integer, resulting in negative values wrapping around.