Compilare: user.cpp: In function ‘int main()’: user.cpp:12:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d%d", &n, &m, &k); ^ user.cpp:15:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &a[i][j]); ^ user.cpp:20:20: warning: ‘x1’ is used uninitialized in this function [-Wuninitialized] dp[x1][y1][1] = 1; ^ user.cpp:20:20: warning: ‘y1’ is used uninitialized in this function [-Wuninitialized] user.cpp:10:24: warning: ‘x2’ may be used uninitialized in this function [-Wmaybe-uninitialized] int n, m, k, x1, y1, x2, y2, ans; ^ user.cpp:10:28: warning: ‘y2’ may be used uninitialized in this function [-Wmaybe-uninitialized] int n, m, k, x1, y1, x2, y2, ans; ^