Compilare: main.cpp: In function 'bool solve(int)': main.cpp:34:28: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses] if(mask & (1 << i) != 0){ ~~~~~~~~~^~~~ main.cpp:36:36: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses] if(mask & (1 << j) == 0){ ~~~~~~~~~^~~~ main.cpp: In function 'int main()': main.cpp:49:38: 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; ^