Compilare: user.cpp: In function ‘bool checksol()’: user.cpp:14:6: warning: unused variable ‘j’ [-Wunused-variable] int j, k, line, col; ^ user.cpp:14:9: warning: unused variable ‘k’ [-Wunused-variable] int j, k, line, col; ^ user.cpp:14:12: warning: unused variable ‘line’ [-Wunused-variable] int j, k, line, col; ^ user.cpp:14:18: warning: unused variable ‘col’ [-Wunused-variable] int j, k, line, col; ^ user.cpp: In function ‘int main()’: user.cpp:24:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("damesah.in","r",stdin); ^ 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("damesah.out","w",stdout); ^ user.cpp:27:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &n); ^