Compilare: main.cpp: In function 'bool solve(int)': main.cpp:35:28: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses] if(mask & (1 << i) != 0 && last >=0){ ~~~~~~~~~^~~~ main.cpp:39:35: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses] } else if(mask & (1 << i) == 0) last = i; ~~~~~~~~~^~~~ main.cpp: In function 'int main()': main.cpp:47:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("coins.out", "w", stdout); ^ main.cpp: In function 'void Read(int&)': main.cpp:22:42: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(f, MAX, 1, IN), pos = 0; ^ main.cpp:27:42: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(f, MAX, 1, IN), pos = 0; ^