Compilare: main.cpp: In function 'int main()': main.cpp:39:24: warning: unused variable 'nr' [-Wunused-variable] int n, t, ii, i, ok, nr, sol1, sol2, k, j; ^~ main.cpp:41:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("risc2.in", "r", stdin); ^ main.cpp:42:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("risc2.out", "w", stdout); ^ main.cpp: In function 'char advance()': main.cpp:15:34: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, SIZE, stdin); ^