Compilare: user.cpp: In function ‘int main()’: user.cpp:40:20: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] while(k>0 & w>0){ ^ user.cpp:8:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("diagonale.in", "r", stdin ); ^ user.cpp:9:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("diagonale.out", "w", stdout); ^