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Add is_rotated #2

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2 changes: 1 addition & 1 deletion README.md
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
# libcompetitive

A C++ header-only library with snippets useful for Competitive Programming.
A C++ header-only library with snippets useful (and not only) for Competitive Programming.

## Example usage

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19 changes: 19 additions & 0 deletions include/libcompetitive.hxx
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
#pragma once

#include <cstdio>
#include <vector>

inline int parseint(void) {
int c, n;
Expand All @@ -10,3 +11,21 @@ inline int parseint(void) {

return n;
}

template <typename T, typename A>
inline bool is_rotated(std::vector<T, A> const& v) {
int rises = 0;
int falls = 0;
for (size_t i = 0, s = v.size(); i < s; i++) {
if (v[i] < v[(i + 1) % s]) {
rises++;
}
if (v[i] > v[(i + 1) % s]) {
falls++;
}
if (rises > 1 && falls > 1) {
return false;
}
}
return true;
}