Compilare: user.cpp: In function ‘int f(int, int, int)’: user.cpp:7:9: warning: unused variable ‘i’ [-Wunused-variable] int i , sol = 0 , ok = 1 ; ^ user.cpp: In function ‘int main()’: user.cpp:34:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "nrtri.in" , "r" , stdin ) ; ^ user.cpp:35:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "nrtri.out" , "w" , stdout ) ; ^ user.cpp:37:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d" , &n ) ; ^ user.cpp:39:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d" , &v[i] ) ; ^