Compilare: user.cpp: In function ‘void Solve()’: user.cpp:105:78: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] { S[i & 1][0] = 1 ; for ( int j = 1; j <= i; ++j ) S[i & 1][j] = S[i - 1 & 1][j] + S[i - 1 & 1][j - 1] ; } ^ user.cpp:105:96: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] { S[i & 1][0] = 1 ; for ( int j = 1; j <= i; ++j ) S[i & 1][j] = S[i - 1 & 1][j] + S[i - 1 & 1][j - 1] ; } ^ user.cpp: In function ‘int main()’: user.cpp:119:26: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(In,"r",stdin); ^ user.cpp:120:28: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(Out,"w",stdout); ^ user.cpp:122:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %s %s",&N,&D,sir1,sir2) ; ^