Compilare: main.cpp: In function 'long long int Ans(int, int)': main.cpp:70:9: warning: unused variable 'ret' [-Wunused-variable] int ret = 0; ^~~ main.cpp: In function 'int main()': main.cpp:81:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:84:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i][j]); ^