Compilare: user.cpp: In function ‘int main()’: user.cpp:17:18: warning: unused variable ‘k’ [-Wunused-variable] int n=read(),k=read(); ^ user.cpp: In function ‘int read()’: user.cpp:9:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",c+1); ^ user.cpp: In function ‘int main()’: user.cpp:16:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("triangles.in","r",stdin); ^