Compilare: user.cpp: In function ‘void solve()’: user.cpp:25:48: warning: operation on ‘b[1][j]’ may be undefined [-Wsequence-point] b[1][j] = b[1][j] = b[1][j-1] + v[1][j]; ^ user.cpp: In function ‘void read()’: user.cpp:9:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "tort2.in", "r", stdin ); ^ user.cpp:10:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d%d%d", &m, &n, &k ); ^ user.cpp:13:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d", &v[i][j] ); ^ user.cpp: In function ‘void write()’: user.cpp:41:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "tort2.out", "w", stdout ); ^