Compilare: user.cpp: In function ‘bool match(char, char)’: user.cpp:13:22: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] return c1 == '{' && c2 == '}' || ^ user.cpp:15:22: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] c1 == '[' && c2 == ']'; ^ user.cpp: In function ‘int main()’: user.cpp:20:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("paranteze.in","r",stdin); ^ user.cpp:21:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("paranteze.out","w",stdout); ^ user.cpp:22:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&n); ^ user.cpp:26:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&c); ^