Compilare: user.cpp: In function ‘void DP()’: user.cpp:14:26: warning: left operand of comma operator has no effect [-Wunused-value] for(int j = 0; j < Nmax, j < i; ++ j) ^ user.cpp: In function ‘int main()’: user.cpp:26:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ user.cpp:31:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ", &k); ^ user.cpp:32:20: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s + 1); ^ /tmp/ccxknwgQ.o: In function `main': user.cpp:(.text.startup+0x5c): warning: the `gets' function is dangerous and should not be used.