Compilare: user.cpp: In function ‘int main()’: user.cpp:52:57: warning: format ‘%s’ expects argument of type ‘char*’, but argument 4 has type ‘char (*)[260]’ [-Wformat=] scanf ("%d %d %s", &inf[i].f, &inf[i].s, &str[i]); ^ user.cpp:55:19: warning: unused variable ‘x’ [-Wunused-variable] long long x = calc (inf[i].f, inf[i].s, i); ^ user.cpp:46:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("mxl.in", "r", stdin); ^ user.cpp:47:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("mxl.out", "w", stdout); ^ user.cpp:49:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &n, &k); ^ user.cpp:52:58: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d %s", &inf[i].f, &inf[i].s, &str[i]); ^