Compilare: user.cpp: In function ‘int main()’: user.cpp:12:24: warning: unused variable ‘start’ [-Wunused-variable] int L = strlen(s), start = 1, ok = 0, nr = 0; ^ user.cpp:12:43: warning: unused variable ‘nr’ [-Wunused-variable] int L = strlen(s), start = 1, ok = 0, nr = 0; ^ user.cpp:9:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("paranteze2.in", "r", stdin); ^ user.cpp:10:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("paranteze2.out", "w", stdout); ^ user.cpp:11:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s); ^