Compilare: user.cpp: In function ‘int main()’: user.cpp:31:27: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[1503]’ [-Wformat=] scanf("%s\n", &str); ^ user.cpp:25:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("logs.in", "r", stdin); ^ user.cpp:26:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &N,&M); ^ user.cpp:31:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", &str); ^