Compilare: user.cpp: In function ‘int main()’: user.cpp:37:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0, j = 0; i < v.size(); i++) ^ user.cpp:55:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0, prev = 0; i < w.size(); i++) ^ user.cpp: In function ‘int get_nr()’: user.cpp:94:14: warning: suggest parentheses around comparison in operand of ‘|’ [-Wparentheses] while(48 > c | c > 57) ^ user.cpp:101:13: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] while(c > 47 & c < 58) ^ user.cpp: In function ‘int main()’: user.cpp:15:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("excel.in", "r", stdin); ^ user.cpp:16:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("excel.out", "w", stdout); ^