Compilare: main.cpp: In function 'int main()': main.cpp:99:32: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] if(1<<(x+1)-1==b) ~~~~~^~ main.cpp:54:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("multisum.in", "r",stdin); ^ main.cpp:55:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("multisum.out", "w", stdout); ^ main.cpp:57:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &cer); ^ main.cpp:77:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a, &b); ^