Compilare: user.cpp: In function ‘int main()’: user.cpp:8:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lacusta.in" , "r" , stdin); ^ user.cpp:9:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lacusta.out" , "w" , stdout); ^ user.cpp:11:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d" , &n , &m); ^ user.cpp:14:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &a[i][j]); ^ user.cpp:41:41: warning: ‘last2’ may be used uninitialized in this function [-Wmaybe-uninitialized] c[i][j] = c[i - 1][last2] + a[i - 1][j] + a[i][j]; ~~~~~~~~~~~~~~^ user.cpp:39:41: warning: ‘last1’ may be used uninitialized in this function [-Wmaybe-uninitialized] c[i][j] = c[i - 1][last1] + a[i - 1][j] + a[i][j]; ~~~~~~~~~~~~~~^