Compilare: user.cpp: In function ‘void merge(int, int)’: user.cpp:22:33: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if((p2 > b) || v[p1] <= v[p2] && p1 <= (a+b)/2) ^ user.cpp:28:42: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if((p1 > (a + b) / 2) || v[p1] > v[p2] && p2 <= b) ^ user.cpp: In function ‘int main()’: user.cpp:49:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("algsort.in" , "r", stdin); ^ user.cpp:50:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("algsort.out" , "w", stdout); ^