Compilare: user.cpp: In function ‘int numara(int, int)’: user.cpp:138:9: warning: unused variable ‘sol’ [-Wunused-variable] int sol = 0; ^ user.cpp: In function ‘int main()’: user.cpp:162:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pscpld2d.in", "r", stdin); ^ user.cpp:163:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pscpld2d.out", "w", stdout); ^ user.cpp:165:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &N); ^ user.cpp:166:40: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread( str, 1, Nmax * Nmax, stdin ); ^