Compilare: user.cpp: In function ‘void read()’: user.cpp:26:45: warning: operation on ‘j’ may be undefined [-Wsequence-point] C[_i][j]=C[_i-1][j]+T[_i--][j++]; ^ user.cpp:26:45: warning: operation on ‘j’ may be undefined [-Wsequence-point] user.cpp:26:45: warning: operation on ‘_i’ may be undefined [-Wsequence-point] user.cpp:26:45: warning: operation on ‘_i’ may be undefined [-Wsequence-point] user.cpp:17:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (i=1,scanf("%d",&N);i<=N;i++) ^ user.cpp:23:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&T[_i][j]); ^ user.cpp: In function ‘int main()’: user.cpp:83:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("triunghi3.in","r",stdin); ^ user.cpp:84:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("triunghi3.out","w",stdout); ^