Compilare: user.cpp: In function ‘int dp(int, int, bool)’: user.cpp:16:16: warning: unused variable ‘i’ [-Wunused-variable] int res=r*c+1,i,next,tx,ty; ^ user.cpp:16:23: warning: unused variable ‘tx’ [-Wunused-variable] int res=r*c+1,i,next,tx,ty; ^ user.cpp:16:26: warning: unused variable ‘ty’ [-Wunused-variable] int res=r*c+1,i,next,tx,ty; ^ user.cpp: In function ‘int main()’: user.cpp:43:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bemo.in","r",stdin); ^ user.cpp:44:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bemo.out","w",stdout); ^ user.cpp:46:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&r,&c); ^ user.cpp:50:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i][j]); ^